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DOE OSTI2020

Materials Data on Fe8N by Materials Project

Fe8N crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are three inequivalent Fe sites. In the first Fe site, Fe is bonded in a distorted body-centered cubic geometry to eight equivalent Fe atoms. All Fe–Fe bond lengths are 2.55 Å. In the second Fe site, Fe is bonded in a single-bond geometry to one N atom. The Fe–N bond length is 1.83 Å. In the third Fe site, Fe is bonded in a single-bond geometry to four equivalent Fe and one N atom. The Fe–N bond length is 1.96 Å. N is bonded in an octahedral geometry to six Fe atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2021

Environment of Metal–O–Fe Bonds Enabling High Activity in CO 2 Reduction on Single Metal Atoms and on Supported Nanoparticles

Single-atom catalysts are often reported to have catalytic properties that surpass those of nanoparticles, while a direct comparison of sites common and different for both is lacking. In this work, we show that single atoms of the Pt-group embedded into the surface of Fe 3 O 4 have a greatly enhanced interaction strength with CO 2 compared with Fe 3 O 4 surface. The strong CO 2 adsorption on single Rh atoms and corresponding low activation energies lead to two-orders-of-magnitude higher conversion rates of CO 2 compared to Rh nanoparticles. This high activity of single atoms stems from the partially oxidic state imposed by their coordination to the support. Fe 3 O 4 -supported Rh nanoparticles follow the behavior of single atoms for CO 2 interaction and reduction, which is attributed to the dominating role of partially oxidic sites at the Fe 3 O 4 -Rh interface. Thus, we show a likely common catalytic chemistry for two kinds of materials thought to be different, and we show that single atoms of Pt-group metals on Fe 3 O 4 are an especially successful material for catalyzed reactions that depend primarily upon sites with the metal-O-Fe environment.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2020

Materials Data on Sm4Fe31(CoC2)3 by Materials Project

Sm4Fe31(CoC2)3 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are four inequivalent Sm sites. In the first Sm site, Sm is bonded in a distorted trigonal planar geometry to four Fe and three C atoms. There are a spread of Sm–Fe bond distances ranging from 3.10–3.36 Å. There are one shorter (2.51 Å) and two longer (2.52 Å) Sm–C bond lengths. In the second Sm site, Sm is bonded in a distorted trigonal planar geometry to four Fe and three C atoms. There are a spread of Sm–Fe bond distances ranging from 3.11–3.36 Å. There are one shorter (2.51 Å) and two longer (2.52 Å) Sm–C bond lengths. In the third Sm site, Sm is bonded in a distorted trigonal planar geometry to four Fe and three C atoms. There are a spread of Sm–Fe bond distances ranging from 3.14–3.37 Å. There are one shorter (2.50 Å) and two longer (2.51 Å) Sm–C bond lengths. In the fourth Sm site, Sm is bonded in a distorted trigonal planar geometry to four Fe and three C atoms. There are a spread of Sm–Fe bond distances ranging from 3.12–3.36 Å. There are one shorter (2.50 Å) and two longer (2.51 Å) Sm–C bond lengths. There are thirty-one inequivalent Fe sites. In the first Fe site, Fe is bonded in a 2-coordinate geometry to one Sm and thirteen Fe atoms. There are a spread of Fe–Fe bond distances ranging from 2.38–2.75 Å. In the second Fe site, Fe is bonded in a 2-coordinate geometry to one Sm and thirteen Fe atoms. There are a spread of Fe–Fe bond distances ranging from 2.38–2.75 Å. In the third Fe site, Fe is bonded in a 3-coordinate geometry to one Sm, twelve Fe, and one Co atom. There are a spread of Fe–Fe bond distances ranging from 2.66–2.75 Å. The Fe–Co bond length is 2.65 Å. In the fourth Fe site, Fe is bonded in a 4-coordinate geometry to one Sm, eleven Fe, and two Co atoms. There are a spread of Fe–Fe bond distances ranging from 2.66–2.73 Å. There are one shorter (2.65 Å) and one longer (2.66 Å) Fe–Co bond lengths. In the fifth Fe site, Fe is bonded to two Sm, nine Fe, and one Co atom to form distorted FeSm2Fe9Co cuboctahedra that share corners with four FeSm2Fe8Co2 cuboctahedra, corners with two CSm2Fe4 octahedra, faces with four FeSm2Fe9Co cuboctahedra, and faces with four CSm2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. There are a spread of Fe–Fe bond distances ranging from 2.44–2.49 Å. The Fe–Co bond length is 2.47 Å. In the sixth Fe site, Fe is bonded to two Sm, nine Fe, and one Co atom to form distorted FeSm2Fe9Co cuboctahedra that share corners with four FeSm2Fe8Co2 cuboctahedra, corners with two CSm2Fe4 octahedra, faces with four FeSm2Fe8Co2 cuboctahedra, and faces with four CSm2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. There are a spread of Fe–Fe bond distances ranging from 2.44–2.49 Å. The Fe–Co bond length is 2.47 Å. In the seventh Fe site, Fe is bonded to two Sm, eight Fe, and two Co atoms to form distorted FeSm2Fe8Co2 cuboctahedra that share corners with four FeSm2Fe9Co cuboctahedra, corners with two CSm2Fe4 octahedra, faces with four FeSm2Fe9Co cuboctahedra, and faces with four CSm2Fe3Co octahedra. The corner-sharing octahedral tilt angles are 45°. There are a spread of Fe–Fe bond distances ranging from 2.44–2.49 Å. Both Fe–Co bond lengths are 2.47 Å. In the eighth Fe site, Fe is bonded to two Sm, nine Fe, and one Co atom to form distorted FeSm2Fe9Co cuboctahedra that share corners with four FeSm2Fe9Co cuboctahedra, corners with two CSm2Fe4 octahedra, faces with four FeSm2Fe9Co cuboctahedra, and faces with four CSm2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. There are a spread of Fe–Fe bond distances ranging from 2.45–2.49 Å. The Fe–Co bond length is 2.47 Å. In the ninth Fe site, Fe is bonded to two Sm and ten Fe atoms to form distorted FeSm2Fe10 cuboctahedra that share corners with four FeSm2Fe9Co cuboctahedra, corners with two CSm2Fe3Co octahedra, faces with four FeSm2Fe9Co cuboctahedra, and faces with four CSm2Fe4 octahedra. The corner-sharing octahedra tilt angles range from 45–46°. There are four shorter (2.45 Å) and four longer (2.48 Å) Fe–Fe bond lengths. In the tenth Fe site, Fe is bonded to two Sm, nine Fe, and one Co atom to form distorted FeSm2Fe9Co cuboctahedra that share corners with four FeSm2Fe9Co cuboctahedra, corners with two CSm2Fe3Co octahedra, faces with four FeSm2Fe8Co2 cuboctahedra, and faces with four CSm2Fe3Co octahedra. The corner-sharing octahedra tilt angles range from 44–45°. There are a spread of Fe–Fe bond distances ranging from 2.44–2.48 Å. The Fe–Co bond length is 2.47 Å. In the eleventh Fe site, Fe is bonded in a single-bond geometry to four Fe and one C atom. The Fe–C bond length is 1.89 Å. In the twelfth Fe site, Fe is bonded in a single-bond geometry to four Fe and one C atom. The Fe–C bond length is 1.88 Å. In the thirteenth Fe site, Fe is bonded in a single-bond geometry to four Fe and one C atom. The Fe–C bond length is 1.88 Å. In the fourteenth Fe site, Fe is bonded in a single-bond geometry to four Fe and one C atom. The Fe–C bond length is 1.88 Å. In the fifteenth Fe site, Fe is bonded in a single-bond geometry to four Fe and one C atom. The Fe–C bond length is 1.89 Å. In the sixteenth Fe site, Fe is bonded in a single-bond geometry to four Fe and one C atom. The Fe–C bond length is 1.89 Å. In the seventeenth Fe site, Fe is bonded in a single-bond geometry to four Fe and one C atom. The Fe–C bond length is 1.88 Å. In the eighteenth Fe site, Fe is bonded in a single-bond geometry to four Fe and one C atom. The Fe–C bond length is 1.88 Å. In the nineteenth Fe site, Fe is bonded in a single-bond geometry to four Fe and one C atom. The Fe–C bond length is 1.89 Å. In the twentieth Fe site, Fe is bonded in a single-bond geometry to four Fe and one C atom. The Fe–C bond length is 1.89 Å. In the twenty-first Fe site, Fe is bonded in a single-bond geometry to four Fe and one C atom. The Fe–C bond length is 1.88 Å. In the twenty-second Fe site, Fe is bonded in a single-bond geometry to four Fe and one C atom. The Fe–C bond length is 1.89 Å. In the twenty-third Fe site, Fe is bonded in a single-bond geometry to three Fe and one C atom. The Fe–C bond length is 1.91 Å. In the twenty-fourth Fe site, Fe is bonded in a single-bond geometry to three Fe and one C atom. The Fe–C bond length is 1.91 Å. In the twenty-fifth Fe site, Fe is bonded in a single-bond geometry to three Fe and one C atom. The Fe–C bond length is 1.91 Å. In the twenty-sixth Fe site, Fe is bonded in a single-bond geometry to three Fe and one C atom. The Fe–C bond length is 1.91 Å. In the twenty-seventh Fe site, Fe is bonded in a single-bond geometry to three Fe and one C atom. The Fe–C bond length is 1.90 Å. In the twenty-eighth Fe site, Fe is bonded in a single-bond geometry to three Fe and one C atom. The Fe–C bond length is 1.92 Å. In the twenty-ninth Fe site, Fe is bonded in a single-bond geometry to three Fe and one C atom. The Fe–C bond length is 1.90 Å. In the thirtieth Fe site, Fe is bonded in a single-bond geometry to three Fe and one C atom. The Fe–C bond length is 1.92 Å. In the thirty-first Fe site, Fe is bonded in a single-bond geometry to three Fe and one C atom. The Fe–C bond length is 1.92 Å. There are three inequivalent Co sites. In the first Co site, Co is bonded in a single-bond geometry to three Fe and one C atom. The Co–C bond length is 1.88 Å. In the second Co site, Co is bonded in a single-bond geometry to three Fe and one C atom. The Co–C bond length is 1.88 Å. In the third Co site, Co is bonded in a single-bond geometry to three Fe and one C atom. The Co–C bond length is 1.87 Å. There are six inequivalent C sites. In the first C site, C is bonded to two Sm and four Fe atoms to form CSm2Fe4 octahedra that share corners with two FeSm2Fe9Co cuboctahedra, corners with four CSm2Fe4 octahedra, and faces with four FeSm2Fe9Co cuboctahedra. The corner-sharing octahedra tilt angles range from 60–61°. In the second C site, C is bonded to two Sm, three Fe, and one Co atom to form CSm2Fe3Co octahedra that share corners with two FeSm2Fe9Co cuboctahedra, corners with four CSm2Fe4 octahedra, and faces with four FeSm2Fe8Co2 cuboctahedra. The corner-sharing octahedra tilt angles range from 60–61°. In the third C site, C is bonded to two Sm and four Fe atoms to form CSm2Fe4 octahedra that share corners with two FeSm2Fe9Co cuboctahedra, corners with four CSm2Fe4 octahedra, and faces with four FeSm2Fe9Co cuboctahedra. The corner-sharing octahedra tilt angles range from 60–61°. In the fourth C site, C is bonded to two Sm and four Fe atoms to form CSm2Fe4 octahedra that share corners with two FeSm2Fe8Co2 cuboctahedra, corners with four CSm2Fe3Co octahedra, and faces with four FeSm2Fe9Co cuboctahedra. The corner-sharing octahedra tilt angles range from 60–61°. In the fifth C site, C is bonded to two Sm, three Fe, and one Co atom to form CSm2Fe3Co octahedra that share corners with two FeSm2Fe10 cuboctahedra, corners with four CSm2Fe4 octahedra, and faces with four FeSm2Fe9Co cuboctahedra. The corner-sharing octahedra tilt angles range from 60–61°. In the sixth C site, C is bonded to two Sm, three Fe, and one Co atom to form CSm2Fe3Co octahedra that share corners with two FeSm2Fe10 cuboctahedra, corners with four CSm2Fe4 octahedra, and faces with four FeSm2Fe9Co cuboctahedra. The corner-sharing octahedra tilt angles range from 60–61°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Zn2Fe(PO6)2 by Materials Project

FeZn2(PO6)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. Fe is bonded to six O atoms to form FeO6 octahedra that share corners with two equivalent PO4 tetrahedra. There are a spread of Fe–O bond distances ranging from 1.80–1.92 Å. Zn is bonded to four O atoms to form ZnO4 tetrahedra that share corners with two equivalent ZnO4 tetrahedra and corners with four equivalent PO4 tetrahedra. There are a spread of Zn–O bond distances ranging from 1.93–2.03 Å. P is bonded to four O atoms to form PO4 tetrahedra that share a cornercorner with one FeO6 octahedra and corners with four equivalent ZnO4 tetrahedra. The corner-sharing octahedral tilt angles are 44°. There are a spread of P–O bond distances ranging from 1.53–1.59 Å. There are six inequivalent O sites. In the first O site, O is bonded in a distorted bent 150 degrees geometry to one Fe and one P atom. In the second O site, O is bonded in a bent 150 degrees geometry to one Zn and one P atom. In the third O site, O is bonded in a bent 120 degrees geometry to one Zn and one P atom. In the fourth O site, O is bonded in a trigonal planar geometry to two equivalent Zn and one P atom. In the fifth O site, O is bonded in a single-bond geometry to one Fe atom. In the sixth O site, O is bonded in a single-bond geometry to one Fe atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cs2FeOF5 by Materials Project

Cs2FeOF5 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Cs is bonded in a 12-coordinate geometry to ten F atoms. There are a spread of Cs–F bond distances ranging from 3.04–3.48 Å. Fe is bonded in an octahedral geometry to one O and five F atoms. The Fe–O bond length is 2.10 Å. There is one shorter (1.91 Å) and four longer (1.95 Å) Fe–F bond length. O is bonded in a single-bond geometry to one Fe atom. There are three inequivalent F sites. In the first F site, F is bonded in a distorted single-bond geometry to four equivalent Cs and one Fe atom. In the second F site, F is bonded in a single-bond geometry to four equivalent Cs and one Fe atom. In the third F site, F is bonded in a single-bond geometry to four equivalent Cs and one Fe atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZnFe(SO8)2 by Materials Project

FeZn(SO7)2O2 crystallizes in the monoclinic P2_1/c space group. The structure is one-dimensional and consists of four hydrogen peroxide molecules and two FeZn(SO7)2 ribbons oriented in the (1, 0, 0) direction. In each FeZn(SO7)2 ribbon, there are two inequivalent Fe sites. In the first Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with two equivalent FeO6 octahedra and corners with two equivalent SO4 tetrahedra. The corner-sharing octahedral tilt angles are 38°. There are a spread of Fe–O bond distances ranging from 1.96–2.18 Å. In the second Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with two equivalent FeO6 octahedra and corners with two equivalent SO4 tetrahedra. The corner-sharing octahedral tilt angles are 38°. There are a spread of Fe–O bond distances ranging from 1.82–2.19 Å. Zn is bonded in a 4-coordinate geometry to five O atoms. There are a spread of Zn–O bond distances ranging from 1.84–2.57 Å. There are two inequivalent S sites. In the first S site, S is bonded to four O atoms to form SO4 tetrahedra that share corners with two FeO6 octahedra. The corner-sharing octahedra tilt angles range from 45–53°. There is two shorter (1.48 Å) and two longer (1.50 Å) S–O bond length. In the second S site, S is bonded in a trigonal planar geometry to three O atoms. There are a spread of S–O bond distances ranging from 1.42–1.46 Å. There are fourteen inequivalent O sites. In the first O site, O is bonded in a single-bond geometry to one S atom. In the second O site, O is bonded in a single-bond geometry to one Fe atom. In the third O site, O is bonded in a distorted bent 150 degrees geometry to one Fe and one S atom. In the fourth O site, O is bonded in a single-bond geometry to one Zn atom. In the fifth O site, O is bonded in a distorted single-bond geometry to one O atom. The O–O bond length is 1.24 Å. In the sixth O site, O is bonded in a single-bond geometry to one S atom. In the seventh O site, O is bonded in a single-bond geometry to one Zn atom. In the eighth O site, O is bonded in a single-bond geometry to one Zn atom. In the ninth O site, O is bonded in a distorted bent 150 degrees geometry to one Fe and one S atom. In the tenth O site, O is bonded in a bent 150 degrees geometry to two Fe atoms. In the eleventh O site, O is bonded in a bent 120 degrees geometry to one Zn and one S atom. In the twelfth O site, O is bonded in a bent 120 degrees geometry to one Zn and one O atom. In the thirteenth O site, O is bonded in a bent 120 degrees geometry to one Fe and one S atom. In the fourteenth O site, O is bonded in a single-bond geometry to one S atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Fe11MoC4 by Materials Project

MoFe5C2(Fe3C)2 crystallizes in the monoclinic Pm space group. The structure is two-dimensional and consists of one Fe3C sheet oriented in the (0, 1, 0) direction and one MoFe5C2 sheet oriented in the (0, 1, 0) direction. In the Fe3C sheet, there are four inequivalent Fe sites. In the first Fe site, Fe is bonded in a single-bond geometry to one C atom. The Fe–C bond length is 1.79 Å. In the second Fe site, Fe is bonded in a single-bond geometry to one C atom. The Fe–C bond length is 1.88 Å. In the third Fe site, Fe is bonded in a square co-planar geometry to four C atoms. There are two shorter (2.01 Å) and two longer (2.04 Å) Fe–C bond lengths. In the fourth Fe site, Fe is bonded in a square co-planar geometry to four C atoms. There are a spread of Fe–C bond distances ranging from 1.99–2.04 Å. There are two inequivalent C sites. In the first C site, C is bonded to six Fe atoms to form a mixture of corner and edge-sharing CFe6 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. In the second C site, C is bonded to six Fe atoms to form a mixture of corner and edge-sharing CFe6 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. In the MoFe5C2 sheet, Mo is bonded in a square co-planar geometry to four C atoms. There are a spread of Mo–C bond distances ranging from 2.10–2.12 Å. There are three inequivalent Fe sites. In the first Fe site, Fe is bonded in a single-bond geometry to one C atom. The Fe–C bond length is 1.89 Å. In the second Fe site, Fe is bonded in a single-bond geometry to one C atom. The Fe–C bond length is 1.90 Å. In the third Fe site, Fe is bonded in a square co-planar geometry to four C atoms. There are a spread of Fe–C bond distances ranging from 1.92–1.95 Å. There are two inequivalent C sites. In the first C site, C is bonded to two equivalent Mo and four Fe atoms to form a mixture of corner and edge-sharing CFe4Mo2 octahedra. The corner-sharing octahedra tilt angles range from 0–1°. In the second C site, C is bonded to two equivalent Mo and four Fe atoms to form a mixture of corner and edge-sharing CFe4Mo2 octahedra. The corner-sharing octahedra tilt angles range from 0–1°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm2Fe15Co2C3 by Materials Project

Sm2Fe15Co2C3 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are two inequivalent Sm sites. In the first Sm site, Sm is bonded in a distorted trigonal planar geometry to four Fe and three C atoms. There are a spread of Sm–Fe bond distances ranging from 3.12–3.37 Å. There are two shorter (2.52 Å) and one longer (2.53 Å) Sm–C bond lengths. In the second Sm site, Sm is bonded in a distorted trigonal planar geometry to four Fe and three C atoms. There are one shorter (3.13 Å) and three longer (3.36 Å) Sm–Fe bond lengths. There are two shorter (2.51 Å) and one longer (2.52 Å) Sm–C bond lengths. There are ten inequivalent Fe sites. In the first Fe site, Fe is bonded in a single-bond geometry to four Fe and one C atom. There are a spread of Fe–Fe bond distances ranging from 2.45–2.74 Å. The Fe–C bond length is 1.89 Å. In the second Fe site, Fe is bonded in a single-bond geometry to four Fe and one C atom. There are a spread of Fe–Fe bond distances ranging from 2.44–2.74 Å. The Fe–C bond length is 1.88 Å. In the third Fe site, Fe is bonded in a single-bond geometry to four Fe and one C atom. There are a spread of Fe–Fe bond distances ranging from 2.44–2.75 Å. The Fe–C bond length is 1.89 Å. In the fourth Fe site, Fe is bonded to two Sm, nine Fe, and one Co atom to form distorted FeSm2Fe9Co cuboctahedra that share corners with four FeSm2Fe9Co cuboctahedra, corners with two equivalent CSm2Fe3Co octahedra, faces with four FeSm2Fe9Co cuboctahedra, and faces with four CSm2Fe3Co octahedra. The corner-sharing octahedra tilt angles range from 45–46°. There are a spread of Fe–Fe bond distances ranging from 2.48–2.67 Å. The Fe–Co bond length is 2.47 Å. In the fifth Fe site, Fe is bonded to two Sm, eight Fe, and two equivalent Co atoms to form distorted FeSm2Fe8Co2 cuboctahedra that share corners with four equivalent FeSm2Fe9Co cuboctahedra, corners with two equivalent CSm2Fe4 octahedra, faces with four equivalent FeSm2Fe9Co cuboctahedra, and faces with four equivalent CSm2Fe3Co octahedra. The corner-sharing octahedral tilt angles are 45°. There are two shorter (2.49 Å) and two longer (2.67 Å) Fe–Fe bond lengths. Both Fe–Co bond lengths are 2.47 Å. In the sixth Fe site, Fe is bonded in a 2-coordinate geometry to one Sm and thirteen Fe atoms. There are a spread of Fe–Fe bond distances ranging from 2.37–2.66 Å. In the seventh Fe site, Fe is bonded in a 4-coordinate geometry to one Sm, eleven Fe, and two equivalent Co atoms. The Fe–Fe bond length is 2.66 Å. Both Fe–Co bond lengths are 2.65 Å. In the eighth Fe site, Fe is bonded in a single-bond geometry to three Fe and one C atom. The Fe–C bond length is 1.91 Å. In the ninth Fe site, Fe is bonded in a single-bond geometry to three Fe and one C atom. The Fe–C bond length is 1.90 Å. In the tenth Fe site, Fe is bonded in a single-bond geometry to three Fe and one C atom. The Fe–C bond length is 1.91 Å. Co is bonded in a single-bond geometry to three Fe and one C atom. The Co–C bond length is 1.88 Å. There are two inequivalent C sites. In the first C site, C is bonded to two Sm, three Fe, and one Co atom to form CSm2Fe3Co octahedra that share corners with two equivalent FeSm2Fe9Co cuboctahedra, corners with four CSm2Fe3Co octahedra, and faces with four FeSm2Fe9Co cuboctahedra. The corner-sharing octahedra tilt angles range from 60–61°. In the second C site, C is bonded to two Sm and four Fe atoms to form CSm2Fe4 octahedra that share corners with two equivalent FeSm2Fe8Co2 cuboctahedra, corners with four equivalent CSm2Fe3Co octahedra, and faces with four equivalent FeSm2Fe9Co cuboctahedra. The corner-sharing octahedral tilt angles are 60°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

2D Single-Atom Catalyst with Optimized Iron Sites Produced by Thermal Melting of Metal–Organic Frameworks for Oxygen Reduction Reaction

Zeolitic-imidazolate-frameworks-8 (ZIF-8) derivatives have recently been demonstrated as one of the most ideal precursors to prepare single-atom metal catalysts for oxygen reduction reaction (ORR). However, abundant single-atom metal sites are buried in the derived carbon nanoparticles, rendering them useless for ORR. In this work, a novel ZIF-8 "thermal melting" strategy is proposed to prepare a high specific surface area of Fe-N-doped graphene nanosheets (Fe-N/GNs) with single-atom Fe-sites on the surface which are accessible to electrolytes, optimizing their utilization and improving ORR activity. As a result, the Fe-N/GNs material exhibits excellent ORR activity with half-wave potentials of 0.903 V in alkaline media and 0.837 V in acidic media, which are comparable to commercial Pt/C catalysts.

2D↗
DOE OSTI2020

Materials Data on ZnFe(SO8)2 by Materials Project

FeZn(SO7)2O2 crystallizes in the monoclinic P2_1/c space group. The structure is one-dimensional and consists of four oxygen molecules and two FeZn(SO7)2 ribbons oriented in the (1, 0, 0) direction. In each FeZn(SO7)2 ribbon, there are two inequivalent Fe sites. In the first Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with two equivalent FeO6 octahedra and corners with four SO4 tetrahedra. The corner-sharing octahedral tilt angles are 41°. There are a spread of Fe–O bond distances ranging from 2.01–2.07 Å. In the second Fe site, Fe is bonded to six O atoms to form FeO6 octahedra that share corners with two equivalent FeO6 octahedra and corners with two equivalent SO4 tetrahedra. The corner-sharing octahedral tilt angles are 41°. There are a spread of Fe–O bond distances ranging from 1.80–1.99 Å. Zn is bonded in a trigonal planar geometry to three O atoms. There are a spread of Zn–O bond distances ranging from 1.86–2.02 Å. There are two inequivalent S sites. In the first S site, S is bonded to four O atoms to form SO4 tetrahedra that share corners with two FeO6 octahedra. The corner-sharing octahedra tilt angles range from 47–57°. There are a spread of S–O bond distances ranging from 1.44–1.53 Å. In the second S site, S is bonded to four O atoms to form SO4 tetrahedra that share a cornercorner with one FeO6 octahedra. The corner-sharing octahedral tilt angles are 35°. There are a spread of S–O bond distances ranging from 1.47–1.51 Å. There are fourteen inequivalent O sites. In the first O site, O is bonded in a single-bond geometry to one S atom. In the second O site, O is bonded in a single-bond geometry to one Fe atom. In the third O site, O is bonded in a bent 150 degrees geometry to one Fe and one S atom. In the fourth O site, O is bonded in a distorted bent 120 degrees geometry to one Zn and one O atom. The O–O bond length is 1.37 Å. In the fifth O site, O is bonded in a single-bond geometry to one S atom. In the sixth O site, O is bonded in a single-bond geometry to one O atom. The O–O bond length is 1.25 Å. In the seventh O site, O is bonded in a single-bond geometry to one S atom. In the eighth O site, O is bonded in a distorted bent 120 degrees geometry to one Fe and one S atom. In the ninth O site, O is bonded in a bent 150 degrees geometry to two Fe atoms. In the tenth O site, O is bonded in a bent 150 degrees geometry to one Zn and one S atom. In the eleventh O site, O is bonded in a single-bond geometry to one Zn atom. In the twelfth O site, O is bonded in a bent 120 degrees geometry to one Fe and one S atom. In the thirteenth O site, O is bonded in a bent 120 degrees geometry to two O atoms. In the fourteenth O site, O is bonded in a single-bond geometry to one S atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Tb4Fe34C3 by Materials Project

Tb4Fe34C3 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent Tb sites. In the first Tb site, Tb is bonded in a distorted bent 120 degrees geometry to nine Fe and two C atoms. There are a spread of Tb–Fe bond distances ranging from 3.04–3.39 Å. Both Tb–C bond lengths are 2.52 Å. In the second Tb site, Tb is bonded in a distorted single-bond geometry to fourteen Fe and one C atom. There are a spread of Tb–Fe bond distances ranging from 3.02–3.33 Å. The Tb–C bond length is 2.54 Å. There are eighteen inequivalent Fe sites. In the first Fe site, Fe is bonded in a single-bond geometry to seven Fe and one C atom. There are a spread of Fe–Fe bond distances ranging from 2.43–2.75 Å. The Fe–C bond length is 1.86 Å. In the second Fe site, Fe is bonded in a single-bond geometry to seven Fe and one C atom. There are a spread of Fe–Fe bond distances ranging from 2.41–2.74 Å. The Fe–C bond length is 1.86 Å. In the third Fe site, Fe is bonded in a single-bond geometry to six Fe and one C atom. There are a spread of Fe–Fe bond distances ranging from 2.43–2.76 Å. The Fe–C bond length is 1.85 Å. In the fourth Fe site, Fe is bonded in a 12-coordinate geometry to two equivalent Tb and ten Fe atoms. There are a spread of Fe–Fe bond distances ranging from 2.42–2.77 Å. In the fifth Fe site, Fe is bonded to two equivalent Tb and ten Fe atoms to form distorted FeTb2Fe10 cuboctahedra that share corners with nine FeTb2Fe10 cuboctahedra, corners with four CTb2Fe4 octahedra, edges with three FeTb2Fe10 cuboctahedra, edges with two CTb2Fe4 octahedra, and faces with nine FeTb2Fe10 cuboctahedra. The corner-sharing octahedra tilt angles range from 22–29°. There are a spread of Fe–Fe bond distances ranging from 2.43–2.75 Å. In the sixth Fe site, Fe is bonded to two equivalent Tb and ten Fe atoms to form distorted FeTb2Fe10 cuboctahedra that share corners with ten FeTb2Fe10 cuboctahedra, corners with two equivalent CTb2Fe4 octahedra, edges with four FeTb2Fe10 cuboctahedra, an edgeedge with one CTb2Fe4 octahedra, and faces with twelve FeTb2Fe10 cuboctahedra. The corner-sharing octahedra tilt angles range from 25–30°. There are a spread of Fe–Fe bond distances ranging from 2.43–2.76 Å. In the seventh Fe site, Fe is bonded in a 2-coordinate geometry to one Tb and thirteen Fe atoms. There are a spread of Fe–Fe bond distances ranging from 2.39–2.68 Å. In the eighth Fe site, Fe is bonded in a 2-coordinate geometry to one Tb and thirteen Fe atoms. There are a spread of Fe–Fe bond distances ranging from 2.62–2.68 Å. In the ninth Fe site, Fe is bonded to two equivalent Tb and ten Fe atoms to form FeTb2Fe10 cuboctahedra that share corners with eight FeTb2Fe10 cuboctahedra, corners with two equivalent CTb2Fe4 octahedra, edges with four FeTb2Fe10 cuboctahedra, faces with eight FeTb2Fe10 cuboctahedra, and faces with two equivalent CTb2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. There are two shorter (2.47 Å) and two longer (2.48 Å) Fe–Fe bond lengths. In the tenth Fe site, Fe is bonded to two equivalent Tb and ten Fe atoms to form FeTb2Fe10 cuboctahedra that share corners with ten FeTb2Fe10 cuboctahedra, corners with two equivalent CTb2Fe4 octahedra, edges with six FeTb2Fe10 cuboctahedra, and faces with ten FeTb2Fe10 cuboctahedra. The corner-sharing octahedral tilt angles are 45°. There are two shorter (2.47 Å) and two longer (2.49 Å) Fe–Fe bond lengths. In the eleventh Fe site, Fe is bonded to two Tb and ten Fe atoms to form distorted FeTb2Fe10 cuboctahedra that share corners with eleven FeTb2Fe10 cuboctahedra, a cornercorner with one CTb2Fe4 octahedra, edges with five FeTb2Fe10 cuboctahedra, faces with nine FeTb2Fe10 cuboctahedra, and faces with two equivalent CTb2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. There are a spread of Fe–Fe bond distances ranging from 2.47–2.49 Å. In the twelfth Fe site, Fe is bonded to two Tb and ten Fe atoms to form distorted FeTb2Fe10 cuboctahedra that share corners with fifteen FeTb2Fe10 cuboctahedra, edges with three FeTb3Fe9 cuboctahedra, faces with eleven FeTb2Fe10 cuboctahedra, and faces with three CTb2Fe4 octahedra. There are one shorter (2.47 Å) and three longer (2.48 Å) Fe–Fe bond lengths. In the thirteenth Fe site, Fe is bonded to three equivalent Tb and nine Fe atoms to form distorted FeTb3Fe9 cuboctahedra that share corners with twelve FeTb2Fe10 cuboctahedra, corners with four CTb2Fe4 octahedra, edges with four FeTb2Fe10 cuboctahedra, faces with eight FeTb2Fe10 cuboctahedra, and faces with two CTb2Fe4 octahedra. The corner-sharing octahedra tilt angles range from 63–69°. Both Fe–Fe bond lengths are 2.54 Å. In the fourteenth Fe site, Fe is bonded to three equivalent Tb and nine Fe atoms to form FeTb3Fe9 cuboctahedra that share corners with thirteen FeTb2Fe10 cuboctahedra, corners with two equivalent CTb2Fe4 octahedra, edges with six FeTb2Fe10 cuboctahedra, faces with eleven FeTb2Fe10 cuboctahedra, and a faceface with one CTb2Fe4 octahedra. The corner-sharing octahedra tilt angles range from 65–70°. There are one shorter (2.51 Å) and one longer (2.54 Å) Fe–Fe bond lengths. In the fifteenth Fe site, Fe is bonded in a single-bond geometry to five Fe and one C atom. The Fe–C bond length is 1.91 Å. In the sixteenth Fe site, Fe is bonded in a single-bond geometry to seven Fe and one C atom. The Fe–Fe bond length is 2.55 Å. The Fe–C bond length is 1.91 Å. In the seventeenth Fe site, Fe is bonded in a single-bond geometry to five Fe and one C atom. The Fe–C bond length is 1.91 Å. In the eighteenth Fe site, Fe is bonded to three equivalent Tb and nine Fe atoms to form FeTb3Fe9 cuboctahedra that share corners with fourteen FeTb2Fe10 cuboctahedra, corners with two equivalent CTb2Fe4 octahedra, edges with seven FeTb2Fe10 cuboctahedra, faces with ten FeTb2Fe10 cuboctahedra, and a faceface with one CTb2Fe4 octahedra. The corner-sharing octahedra tilt angles range from 66–70°. There are two inequivalent C sites. In the first C site, C is bonded to two Tb and four Fe atoms to form CTb2Fe4 octahedra that share corners with twelve FeTb2Fe10 cuboctahedra, a cornercorner with one CTb2Fe4 octahedra, edges with two FeTb2Fe10 cuboctahedra, and faces with seven FeTb2Fe10 cuboctahedra. The corner-sharing octahedral tilt angles are 63°. In the second C site, C is bonded to two equivalent Tb and four Fe atoms to form CTb2Fe4 octahedra that share corners with ten FeTb2Fe10 cuboctahedra, corners with two equivalent CTb2Fe4 octahedra, edges with two equivalent FeTb2Fe10 cuboctahedra, and faces with six FeTb2Fe10 cuboctahedra. The corner-sharing octahedral tilt angles are 63°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Y4Fe34C3 by Materials Project

Y4Fe34C3 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are two inequivalent Y sites. In the first Y site, Y is bonded in a distorted bent 120 degrees geometry to nine Fe and two C atoms. There are a spread of Y–Fe bond distances ranging from 3.05–3.37 Å. Both Y–C bond lengths are 2.51 Å. In the second Y site, Y is bonded in a distorted single-bond geometry to fourteen Fe and one C atom. There are a spread of Y–Fe bond distances ranging from 3.03–3.32 Å. The Y–C bond length is 2.53 Å. There are eighteen inequivalent Fe sites. In the first Fe site, Fe is bonded in a single-bond geometry to seven Fe and one C atom. There are a spread of Fe–Fe bond distances ranging from 2.41–2.73 Å. The Fe–C bond length is 1.86 Å. In the second Fe site, Fe is bonded in a single-bond geometry to seven Fe and one C atom. There are a spread of Fe–Fe bond distances ranging from 2.43–2.74 Å. The Fe–C bond length is 1.86 Å. In the third Fe site, Fe is bonded in a single-bond geometry to six Fe and one C atom. There are a spread of Fe–Fe bond distances ranging from 2.43–2.74 Å. The Fe–C bond length is 1.86 Å. In the fourth Fe site, Fe is bonded to two equivalent Y and ten Fe atoms to form distorted FeY2Fe10 cuboctahedra that share corners with fifteen FeY2Fe10 cuboctahedra, corners with two equivalent CY2Fe4 octahedra, edges with three FeY2Fe10 cuboctahedra, an edgeedge with one CY2Fe4 octahedra, and faces with fourteen FeY2Fe10 cuboctahedra. The corner-sharing octahedra tilt angles range from 25–30°. There are a spread of Fe–Fe bond distances ranging from 2.42–2.75 Å. In the fifth Fe site, Fe is bonded to two equivalent Y and ten Fe atoms to form distorted FeY2Fe10 cuboctahedra that share corners with nine FeY2Fe10 cuboctahedra, corners with four CY2Fe4 octahedra, edges with three FeY2Fe10 cuboctahedra, edges with two CY2Fe4 octahedra, and faces with ten FeY2Fe10 cuboctahedra. The corner-sharing octahedra tilt angles range from 22–29°. There are a spread of Fe–Fe bond distances ranging from 2.43–2.74 Å. In the sixth Fe site, Fe is bonded to two equivalent Y and ten Fe atoms to form distorted FeY2Fe10 cuboctahedra that share corners with fifteen FeY2Fe10 cuboctahedra, corners with two equivalent CY2Fe4 octahedra, edges with four FeY2Fe10 cuboctahedra, an edgeedge with one CY2Fe4 octahedra, and faces with fourteen FeY2Fe10 cuboctahedra. The corner-sharing octahedra tilt angles range from 25–30°. There are a spread of Fe–Fe bond distances ranging from 2.43–2.75 Å. In the seventh Fe site, Fe is bonded in a 2-coordinate geometry to one Y and thirteen Fe atoms. There are a spread of Fe–Fe bond distances ranging from 2.39–2.67 Å. In the eighth Fe site, Fe is bonded in a 2-coordinate geometry to one Y and thirteen Fe atoms. There are a spread of Fe–Fe bond distances ranging from 2.62–2.67 Å. In the ninth Fe site, Fe is bonded to two equivalent Y and ten Fe atoms to form FeY2Fe10 cuboctahedra that share corners with ten FeY2Fe10 cuboctahedra, corners with two equivalent CY2Fe4 octahedra, edges with four FeY2Fe10 cuboctahedra, faces with eight FeY2Fe10 cuboctahedra, and faces with two equivalent CY2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. There are two shorter (2.46 Å) and two longer (2.47 Å) Fe–Fe bond lengths. In the tenth Fe site, Fe is bonded to two equivalent Y and ten Fe atoms to form FeY2Fe10 cuboctahedra that share corners with ten FeY2Fe10 cuboctahedra, corners with two equivalent CY2Fe4 octahedra, edges with eight FeY2Fe10 cuboctahedra, and faces with twelve FeY2Fe10 cuboctahedra. The corner-sharing octahedral tilt angles are 44°. There are two shorter (2.46 Å) and two longer (2.48 Å) Fe–Fe bond lengths. In the eleventh Fe site, Fe is bonded to two Y and ten Fe atoms to form distorted FeY2Fe10 cuboctahedra that share corners with thirteen FeY2Fe10 cuboctahedra, a cornercorner with one CY2Fe4 octahedra, edges with five FeY2Fe10 cuboctahedra, faces with eleven FeY2Fe10 cuboctahedra, and faces with two equivalent CY2Fe4 octahedra. The corner-sharing octahedral tilt angles are 45°. There are three shorter (2.47 Å) and one longer (2.48 Å) Fe–Fe bond lengths. In the twelfth Fe site, Fe is bonded to two Y and ten Fe atoms to form distorted FeY2Fe10 cuboctahedra that share corners with sixteen FeY2Fe10 cuboctahedra, edges with four FeY2Fe10 cuboctahedra, faces with twelve FeY2Fe10 cuboctahedra, and faces with three CY2Fe4 octahedra. There are one shorter (2.46 Å) and three longer (2.47 Å) Fe–Fe bond lengths. In the thirteenth Fe site, Fe is bonded to three equivalent Y and nine Fe atoms to form FeY3Fe9 cuboctahedra that share corners with thirteen FeY2Fe10 cuboctahedra, corners with four CY2Fe4 octahedra, edges with four FeY2Fe10 cuboctahedra, faces with eight FeY2Fe10 cuboctahedra, and faces with two CY2Fe4 octahedra. The corner-sharing octahedra tilt angles range from 63–69°. There are one shorter (2.54 Å) and one longer (2.55 Å) Fe–Fe bond lengths. In the fourteenth Fe site, Fe is bonded to three equivalent Y and nine Fe atoms to form FeY3Fe9 cuboctahedra that share corners with fifteen FeY2Fe10 cuboctahedra, corners with two equivalent CY2Fe4 octahedra, edges with seven FeY2Fe10 cuboctahedra, faces with fourteen FeY2Fe10 cuboctahedra, and a faceface with one CY2Fe4 octahedra. The corner-sharing octahedra tilt angles range from 65–69°. There are one shorter (2.52 Å) and one longer (2.54 Å) Fe–Fe bond lengths. In the fifteenth Fe site, Fe is bonded in a single-bond geometry to five Fe and one C atom. The Fe–C bond length is 1.91 Å. In the sixteenth Fe site, Fe is bonded in a single-bond geometry to seven Fe and one C atom. The Fe–Fe bond length is 2.56 Å. The Fe–C bond length is 1.91 Å. In the seventeenth Fe site, Fe is bonded in a single-bond geometry to five Fe and one C atom. The Fe–C bond length is 1.91 Å. In the eighteenth Fe site, Fe is bonded to three equivalent Y and nine Fe atoms to form FeY3Fe9 cuboctahedra that share corners with sixteen FeY2Fe10 cuboctahedra, corners with two equivalent CY2Fe4 octahedra, edges with seven FeY2Fe10 cuboctahedra, faces with thirteen FeY2Fe10 cuboctahedra, and a faceface with one CY2Fe4 octahedra. The corner-sharing octahedra tilt angles range from 66–70°. There are two inequivalent C sites. In the first C site, C is bonded to two Y and four Fe atoms to form CY2Fe4 octahedra that share corners with fourteen FeY2Fe10 cuboctahedra, a cornercorner with one CY2Fe4 octahedra, edges with three FeY2Fe10 cuboctahedra, and faces with seven FeY2Fe10 cuboctahedra. The corner-sharing octahedral tilt angles are 63°. In the second C site, C is bonded to two equivalent Y and four Fe atoms to form CY2Fe4 octahedra that share corners with ten FeY2Fe10 cuboctahedra, corners with two equivalent CY2Fe4 octahedra, edges with two equivalent FeY2Fe10 cuboctahedra, and faces with six FeY2Fe10 cuboctahedra. The corner-sharing octahedral tilt angles are 63°.

36 MATERIALS SCIENCE↗
DOE OSTI2022

Demonstration of no catalytical activity of Fe–N–C and Nb–N–C electrocatalysts toward nitrogen reduction using in–line quantification

Ammonia (NH 3 ) production via the electrochemical nitrogen reduction reaction (NRR) is a promising method for sustainable generation of this important chemical. Efforts are ongoing in finding an efficient, stable, and selective catalyst that will enable the reaction. However, progress is hindered in the field due to lack of reproducibility, most likely a consequence of reports of false-positive results due to improper measurement control and methods. In this study, we explore the NRR activity of a promising class of single atom catalysts, transition metal-nitrogen-carbon (M-N-C) electrocatalysts. Using a state-of-the-art in-line ammonia quantification methodology, with detection limit as low as 1 ppb for ammonia, we show that single atom Nb and Fe embedded in a stable carbon and nitrogen framework do not electrochemically reduce N 2 to NH 3 . Critically, this demonstrates that our experimental setup with in-line sequential injection analysis successfully excludes ammonia contamination from the gas supply and atmospheric sources, allowing for thorough and high-throughput examination of potential NRR catalysts.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2023

Facile and Scalable Synthesis of Metal- and Nitrogen-Doped Carbon Nanotubes for Efficient Electrochemical CO 2 Reduction

Metal- and nitrogen-doped carbon (M–N–C) is a promising material to catalyze electrochemical CO 2 reduction reaction (CO 2 RR). However, most M–N–C catalysts in the literature require complicated synthesis procedures and produce small quantities per batch, limiting the commercialization potential. In this work, we developed a simple and scalable synthesis method to convert metal-impurity-containing commercial carbon nanotubes (CNTs) and nitrogen-containing organic precursors into M–N–C via one-step moderate-temperature (650 °C) pyrolysis without any other treatment nor the need to add metal precursors. Batches of catalysts in varied mass up to 10 g (150 mL in volume) per batch were synthesized, and repeatable catalytic performances were demonstrated. To the best of our knowledge, the 10 g batch is one of the largest batches of CO2RR catalysts synthesized in the literature while requiring minimal synthesis steps. The catalyst possessed single-atomic iron–nitrogen (Fe–N) sites, enabling a high performance of >95% CO product selectivity at a high current density of 400 mA/cm 2 and high stability for 45 h at 100 mA/cm 2 in a flow cell testing. The catalyst outperformed a benchmark noble-metal nanoparticle catalyst and achieved longer stability than many other reported M–N–C catalysts in the literature. The scalable and cost-effective synthesis developed in this work paves a pathway toward practical CO 2 RR applications. The direct utilization of metal impurities from raw CNTs for efficient catalyst synthesis with minimal treatment is a green and sustainable engineering approach.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2020

Materials Data on Zr2Fe2F3 by Materials Project

Zr2Fe2F3 crystallizes in the monoclinic Cm space group. The structure is two-dimensional and consists of one Zr2Fe2F3 sheet oriented in the (0, 0, 1) direction. there are three inequivalent Zr sites. In the first Zr site, Zr is bonded in a 4-coordinate geometry to one Fe and four F atoms. The Zr–Fe bond length is 2.84 Å. There are a spread of Zr–F bond distances ranging from 2.18–2.44 Å. In the second Zr site, Zr is bonded in a 3-coordinate geometry to one Fe and three F atoms. The Zr–Fe bond length is 2.68 Å. There are a spread of Zr–F bond distances ranging from 2.09–2.35 Å. In the third Zr site, Zr is bonded in a 3-coordinate geometry to three F atoms. There are one shorter (2.21 Å) and two longer (2.38 Å) Zr–F bond lengths. There are three inequivalent Fe sites. In the first Fe site, Fe is bonded in a single-bond geometry to one F atom. The Fe–F bond length is 1.97 Å. In the second Fe site, Fe is bonded in a distorted single-bond geometry to one F atom. The Fe–F bond length is 2.35 Å. In the third Fe site, Fe is bonded in a 3-coordinate geometry to three Zr atoms. There are four inequivalent F sites. In the first F site, F is bonded in a 3-coordinate geometry to three Zr atoms. In the second F site, F is bonded in a bent 150 degrees geometry to one Zr and one Fe atom. In the third F site, F is bonded in a trigonal non-coplanar geometry to three Zr atoms. In the fourth F site, F is bonded in a 3-coordinate geometry to two Zr and one Fe atom.

36 MATERIALS SCIENCE↗
DOE OSTI2025

Large Anomalous and Topological Hall Effect and Nernst Effect in a Dirac Kagome Magnet Fe 3 Ge

Searching for Kagome magnets with novel magnetic and electronic properties has been attracting significant efforts recently. Here, the magnetic, electronic, and thermoelectric properties of Fe 3 Ge single crystals with Fe atoms forming a slightly distorted Kagome lattice are reported. It is shown that Fe 3 Ge exhibits a large anomalous Hall effect and anomalous Nernst effect. The observed anomalous transverse thermoelectric conductivity $|α^A_{xz}|$ reaches ≈4.6 A m −1 K −1 , which is larger than the conventional ferromagnets and most of the topological ferromagnets reported in literature. The first-principles calculations suggest that these exceptional transport properties are dominated by the intrinsic mechanism, which highlights the significant contribution of the Berry curvature of massive Dirac gaps in the momentum space. Additionally, a topological Hall resistivity of 0.9 µΩ cm and a topological Nernst coefficient of 1.2 µV K −1 are also observed, which are presumably ascribed to the Berry phase associated with the field-induced non-zero scalar spin chirality. These features highlight the synergic effects of the Berry phases in both momentum space and real space of Fe 3 Ge, which render it an excellent candidate for room-temperature thermoelectric applications based on transverse transport.

Kagome magnet↗