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At least 19 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Er(NiGe)2 by Materials Project

Er(NiGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Er is bonded in a 8-coordinate geometry to eight equivalent Ni and eight equivalent Ge atoms. All Er–Ni bond lengths are 3.17 Å. All Er–Ge bond lengths are 3.12 Å. Ni is bonded in a 4-coordinate geometry to four equivalent Er and four equivalent Ge atoms. All Ni–Ge bond lengths are 2.35 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Er, four equivalent Ni, and one Ge atom. The Ge–Ge bond length is 2.50 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr3(NiGe)4 by Materials Project

Pr3(NiGe)4 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. there are two inequivalent Pr sites. In the first Pr site, Pr is bonded to eight equivalent Ni and four equivalent Ge atoms to form a mixture of edge and face-sharing PrNi8Ge4 cuboctahedra. All Pr–Ni bond lengths are 3.18 Å. All Pr–Ge bond lengths are 3.19 Å. In the second Pr site, Pr is bonded in a 6-coordinate geometry to six Ni and eight Ge atoms. There are two shorter (3.17 Å) and four longer (3.19 Å) Pr–Ni bond lengths. There are a spread of Pr–Ge bond distances ranging from 3.18–3.22 Å. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded in a 2-coordinate geometry to six Pr, one Ni, and two equivalent Ge atoms. The Ni–Ni bond length is 2.40 Å. Both Ni–Ge bond lengths are 2.40 Å. In the second Ni site, Ni is bonded in a 9-coordinate geometry to four equivalent Pr and five Ge atoms. There are a spread of Ni–Ge bond distances ranging from 2.40–2.43 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 4-coordinate geometry to four equivalent Pr and four equivalent Ni atoms. In the second Ge site, Ge is bonded in a 3-coordinate geometry to six Pr and three Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NiGe by Materials Project

NiGe is Modderite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Ni is bonded in a 6-coordinate geometry to six equivalent Ge atoms. There are a spread of Ni–Ge bond distances ranging from 2.35–2.52 Å. Ge is bonded in a 6-coordinate geometry to six equivalent Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Lu(NiGe)2 by Materials Project

Lu(NiGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Lu is bonded in a 8-coordinate geometry to eight equivalent Ni and eight equivalent Ge atoms. All Lu–Ni bond lengths are 3.16 Å. All Lu–Ge bond lengths are 3.10 Å. Ni is bonded in a 4-coordinate geometry to four equivalent Lu and four equivalent Ge atoms. All Ni–Ge bond lengths are 2.34 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Lu, four equivalent Ni, and one Ge atom. The Ge–Ge bond length is 2.47 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Li(NiGe)6 by Materials Project

Li(NiGe)6 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. there are two inequivalent Li sites. In the first Li site, Li is bonded to eight Ge atoms to form distorted edge-sharing LiGe8 hexagonal bipyramids. There are two shorter (2.65 Å) and six longer (2.88 Å) Li–Ge bond lengths. In the second Li site, Li is bonded in a hexagonal bipyramidal geometry to eight Ge atoms. There are two shorter (2.66 Å) and six longer (2.85 Å) Li–Ge bond lengths. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded in a 12-coordinate geometry to two equivalent Ni and six Ge atoms. Both Ni–Ni bond lengths are 2.53 Å. There are a spread of Ni–Ge bond distances ranging from 2.43–2.63 Å. In the second Ni site, Ni is bonded in a 10-coordinate geometry to four equivalent Ni and six Ge atoms. There are a spread of Ni–Ge bond distances ranging from 2.42–2.60 Å. There are four inequivalent Ge sites. In the first Ge site, Ge is bonded in a 1-coordinate geometry to one Li, six Ni, and one Ge atom. The Ge–Ge bond length is 2.54 Å. In the second Ge site, Ge is bonded in a 1-coordinate geometry to one Li, six equivalent Ni, and one Ge atom. The Ge–Ge bond length is 2.52 Å. In the third Ge site, Ge is bonded in a 8-coordinate geometry to two equivalent Li and six Ni atoms. In the fourth Ge site, Ge is bonded in a 7-coordinate geometry to one Li and six Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(NiGe)3 by Materials Project

Sm(NiGe)3 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sm is bonded in a 4-coordinate geometry to eight Ni and eight Ge atoms. There are four shorter (3.20 Å) and four longer (3.24 Å) Sm–Ni bond lengths. There are four shorter (3.12 Å) and four longer (3.20 Å) Sm–Ge bond lengths. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded in a 9-coordinate geometry to four equivalent Sm and five Ge atoms. There are one shorter (2.33 Å) and four longer (2.39 Å) Ni–Ge bond lengths. In the second Ni site, Ni is bonded in a 8-coordinate geometry to two equivalent Sm and six Ge atoms. There are four shorter (2.49 Å) and two longer (2.51 Å) Ni–Ge bond lengths. There are four inequivalent Ge sites. In the first Ge site, Ge is bonded in a body-centered cubic geometry to eight equivalent Ni atoms. In the second Ge site, Ge is bonded in a body-centered cubic geometry to eight equivalent Ni atoms. In the third Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Sm and five Ni atoms. In the fourth Ge site, Ge is bonded in a 4-coordinate geometry to four equivalent Sm and four equivalent Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ca(NiGe)2 by Materials Project

Ca(NiGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ca is bonded in a 8-coordinate geometry to eight equivalent Ni and eight equivalent Ge atoms. All Ca–Ni bond lengths are 3.23 Å. All Ca–Ge bond lengths are 3.18 Å. Ni is bonded in a 4-coordinate geometry to four equivalent Ca and four equivalent Ge atoms. All Ni–Ge bond lengths are 2.37 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Ca, four equivalent Ni, and one Ge atom. The Ge–Ge bond length is 2.63 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sc(NiGe)6 by Materials Project

Sc(NiGe)6 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. there are two inequivalent Sc sites. In the first Sc site, Sc is bonded to twelve equivalent Ni and eight Ge atoms to form distorted corner-sharing ScNi12Ge8 hexagonal bipyramids. All Sc–Ni bond lengths are 3.23 Å. There are two shorter (2.68 Å) and six longer (2.94 Å) Sc–Ge bond lengths. In the second Sc site, Sc is bonded to twelve Ni and eight Ge atoms to form a mixture of distorted face and corner-sharing ScNi12Ge8 hexagonal bipyramids. There are four shorter (3.21 Å) and eight longer (3.22 Å) Sc–Ni bond lengths. There are a spread of Sc–Ge bond distances ranging from 2.66–2.95 Å. There are two inequivalent Ni sites. In the first Ni site, Ni is bonded in a 12-coordinate geometry to two Sc, four Ni, and six Ge atoms. All Ni–Ni bond lengths are 2.55 Å. There are a spread of Ni–Ge bond distances ranging from 2.44–2.66 Å. In the second Ni site, Ni is bonded in a 12-coordinate geometry to two equivalent Sc, four Ni, and six Ge atoms. Both Ni–Ni bond lengths are 2.55 Å. There are a spread of Ni–Ge bond distances ranging from 2.44–2.65 Å. There are six inequivalent Ge sites. In the first Ge site, Ge is bonded in a 8-coordinate geometry to two equivalent Sc and six Ni atoms. In the second Ge site, Ge is bonded in a 6-coordinate geometry to six equivalent Ni atoms. In the third Ge site, Ge is bonded in a 12-coordinate geometry to three equivalent Sc and six equivalent Ni atoms. In the fourth Ge site, Ge is bonded in a 8-coordinate geometry to one Sc, six equivalent Ni, and one Ge atom. The Ge–Ge bond length is 2.47 Å. In the fifth Ge site, Ge is bonded in a 8-coordinate geometry to one Sc, six Ni, and one Ge atom. The Ge–Ge bond length is 2.50 Å. In the sixth Ge site, Ge is bonded in a 7-coordinate geometry to one Sc and six Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Th(NiGe)2 by Materials Project

Th(NiGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Th is bonded in a 8-coordinate geometry to eight equivalent Ni and eight equivalent Ge atoms. All Th–Ni bond lengths are 3.21 Å. All Th–Ge bond lengths are 3.22 Å. Ni is bonded in a 4-coordinate geometry to four equivalent Th and four equivalent Ge atoms. All Ni–Ge bond lengths are 2.39 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Th, four equivalent Ni, and one Ge atom. The Ge–Ge bond length is 2.57 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sm(NiGe)2 by Materials Project

Sm(NiGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sm is bonded in a 8-coordinate geometry to eight equivalent Ni and eight equivalent Ge atoms. All Sm–Ni bond lengths are 3.21 Å. All Sm–Ge bond lengths are 3.18 Å. Ni is bonded in a 4-coordinate geometry to four equivalent Sm and four equivalent Ge atoms. All Ni–Ge bond lengths are 2.37 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Sm, four equivalent Ni, and one Ge atom. The Ge–Ge bond length is 2.57 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Np(NiGe)2 by Materials Project

Np(NiGe)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Np is bonded in a 8-coordinate geometry to eight equivalent Ni and eight equivalent Ge atoms. All Np–Ni bond lengths are 3.21 Å. All Np–Ge bond lengths are 3.12 Å. Ni is bonded to four equivalent Np and four equivalent Ge atoms to form a mixture of distorted edge, face, and corner-sharing NiNp4Ge4 tetrahedra. All Ni–Ge bond lengths are 2.36 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Np, four equivalent Ni, and one Ge atom. The Ge–Ge bond length is 2.52 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2022

Effects of doping, hydrostatic pressure, and thermal quenching on the phase transitions and magnetocaloric properties in Mn 1– x Co x NiGe

The effects of doping, hydrostatic pressure, and thermal quenching on the phase transitions and magnetocaloric properties of the Mn 1–x Co x NiGe system have been investigated. Cobalt doping on the Mn site shifted the martensitic structural transition toward lower temperature until it was ultimately absent, leaving only a magnetic transition from a ferromagnetic (FM) to a paramagnetic (PM) state in the high-temperature hexagonal phase. Co-occurrence of the magnetic and structural transitions to form a first-order magnetostructural transition (MST) from the FM orthorhombic to the PM hexagonal phase was observed in samples with 0.05 < x < 0.20. An additional antiferromagnetic–ferromagnetic-like transition was observed in the martensite phase for 0.05 < x < 0.10, which gradually vanished with increasing Co concentration (x > 0.10) or magnetic field (H > 0.5 T). The application of external hydrostatic pressure shifted the structural transition to lower temperature until an MST was formed in samples with x = 0.03 and 0.05, inducing large magnetic entropy changes up to –80.3 J kg –1 K –1 (x = 0.03) for a 7-T field change under 10.6-kbar pressure. Similar to the effects of the application of hydrostatic pressure, an MST was formed near room temperature in the sample with x = 0.03 by annealing at high temperature (1200 °C) followed by quenching, resulting in a large magnetic entropy change of –56.2 J kg –1 K –1 . Furthermore, these experimental results show that the application of pressure and thermal quenching, in addition to compositional variations, are effective methods to create magnetostructural transitions in the MnNiGe system, resulting in large magnetocaloric effects.

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATI↗
DOE OSTI2023

Enhanced magnetocaloric effects in metastable phases of Mn 1- x Co x NiGe generated through thermal quenching and high-pressure annealing

Metastable phases were formed in Mn 1-x Co x NiGe (x = 0.05 and 0.08) by annealing at 800 °C followed by rapid cooling, i.e., quenching, at ambient pressure (P = 0) and under a pressure of P = 3.5 GPa, and their phase transitions and associated magnetocaloric properties were investigated. The crystal cell volumes of the metastable phases decreased, and their structural transitions significantly shifted to lower temperatures relative to those of the slow-cooled compounds, with a greater reduction observed in the samples where the rapid cooling occurred under high pressures. The magnetic and structural transitions coupled to form a magnetostructural transition in the metastable phases, resulting in large magnetic entropy changes up to -79.6 J kg -1 K -1 (x = 0.08 ) for a 7-T field change. As a result, the experimental results demonstrate thermal quenching and high-pressure annealing as alternative methods to create magnetostructural transitions, without modifying the compositions of the materials.

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATI↗
DOE OSTI2020

Materials Data on Hf3(NiGe)4 by Materials Project

Hf3Ni4Ge4 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. there are two inequivalent Hf sites. In the first Hf site, Hf is bonded in a 12-coordinate geometry to six equivalent Ni and six Ge atoms. All Hf–Ni bond lengths are 2.84 Å. There are two shorter (2.84 Å) and four longer (2.87 Å) Hf–Ge bond lengths. In the second Hf site, Hf is bonded to eight equivalent Ni and six Ge atoms to form face-sharing HfNi8Ge6 octahedra. All Hf–Ni bond lengths are 3.28 Å. There are two shorter (2.75 Å) and four longer (2.77 Å) Hf–Ge bond lengths. Ni is bonded in a 12-coordinate geometry to five Hf, three equivalent Ni, and four Ge atoms. There are one shorter (2.61 Å) and two longer (2.79 Å) Ni–Ni bond lengths. There are a spread of Ni–Ge bond distances ranging from 2.38–2.41 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to three Hf and six equivalent Ni atoms. In the second Ge site, Ge is bonded in a 9-coordinate geometry to six Hf, two equivalent Ni, and one Ge atom. The Ge–Ge bond length is 2.61 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on La(NiGe)2 by Materials Project

LaNi2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. La is bonded in a 8-coordinate geometry to eight equivalent Ni and eight equivalent Ge atoms. All La–Ni bond lengths are 3.25 Å. All La–Ge bond lengths are 3.26 Å. Ni is bonded in a 4-coordinate geometry to four equivalent La and four equivalent Ge atoms. All Ni–Ge bond lengths are 2.39 Å. Ge is bonded in a 9-coordinate geometry to four equivalent La, four equivalent Ni, and one Ge atom. The Ge–Ge bond length is 2.66 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Dy(NiGe)2 by Materials Project

DyNi2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Dy is bonded in a 8-coordinate geometry to eight equivalent Ni and eight equivalent Ge atoms. All Dy–Ni bond lengths are 3.18 Å. All Dy–Ge bond lengths are 3.13 Å. Ni is bonded in a 4-coordinate geometry to four equivalent Dy and four equivalent Ge atoms. All Ni–Ge bond lengths are 2.35 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Dy, four equivalent Ni, and one Ge atom. The Ge–Ge bond length is 2.51 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr(NiGe)2 by Materials Project

SrNi2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sr is bonded in a 8-coordinate geometry to eight equivalent Ni and eight equivalent Ge atoms. All Sr–Ni bond lengths are 3.32 Å. All Sr–Ge bond lengths are 3.30 Å. Ni is bonded in a 4-coordinate geometry to four equivalent Sr and four equivalent Ge atoms. All Ni–Ge bond lengths are 2.38 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Sr, four equivalent Ni, and one Ge atom. The Ge–Ge bond length is 2.89 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ce(NiGe)2 by Materials Project

CeNi2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ce is bonded in a 8-coordinate geometry to eight equivalent Ni and eight equivalent Ge atoms. All Ce–Ni bond lengths are 3.20 Å. All Ce–Ge bond lengths are 3.19 Å. Ni is bonded in a 4-coordinate geometry to four equivalent Ce and four equivalent Ge atoms. All Ni–Ge bond lengths are 2.38 Å. Ge is bonded in a 9-coordinate geometry to four equivalent Ce, four equivalent Ni, and one Ge atom. The Ge–Ge bond length is 2.54 Å.

36 MATERIALS SCIENCE↗