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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on SrH2(SeO3)2 by Materials Project

SrH2(SeO3)2 crystallizes in the triclinic P-1 space group. The structure is two-dimensional and consists of one SrH2(SeO3)2 sheet oriented in the (0, 0, 1) direction. Sr2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Sr–O bond distances ranging from 2.55–2.88 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to two O2- atoms. There is one shorter (1.01 Å) and one longer (1.74 Å) H–O bond length. In the second H1+ site, H1+ is bonded in a single-bond geometry to one O2- atom. The H–O bond length is 1.00 Å. There are two inequivalent Se4+ sites. In the first Se4+ site, Se4+ is bonded in a distorted trigonal non-coplanar geometry to three O2- atoms. There are a spread of Se–O bond distances ranging from 1.69–1.83 Å. In the second Se4+ site, Se4+ is bonded in a distorted trigonal non-coplanar geometry to three O2- atoms. There are a spread of Se–O bond distances ranging from 1.69–1.85 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one H1+ and one Se4+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one Sr2+, one H1+, and one Se4+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Sr2+ and one Se4+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to two equivalent Sr2+ and one Se4+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to one Sr2+, one H1+, and one Se4+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to two equivalent Sr2+ and one Se4+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrH2 by Materials Project

SrH2 is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Sr2+ is bonded in a 9-coordinate geometry to nine H1- atoms. There are a spread of Sr–H bond distances ranging from 2.42–2.82 Å. There are two inequivalent H1- sites. In the first H1- site, H1- is bonded to four equivalent Sr2+ atoms to form HSr4 tetrahedra that share corners with eight equivalent HSr5 square pyramids, corners with eight equivalent HSr4 tetrahedra, edges with six equivalent HSr5 square pyramids, and edges with two equivalent HSr4 tetrahedra. In the second H1- site, H1- is bonded to five equivalent Sr2+ atoms to form distorted HSr5 square pyramids that share corners with eight equivalent HSr5 square pyramids, corners with eight equivalent HSr4 tetrahedra, edges with six equivalent HSr5 square pyramids, and edges with six equivalent HSr4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrH2 by Materials Project

SrH2 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Sr2+ is bonded in a 3-coordinate geometry to eleven H1- atoms. There are a spread of Sr–H bond distances ranging from 2.37–2.87 Å. There are two inequivalent H1- sites. In the first H1- site, H1- is bonded to five equivalent Sr2+ atoms to form distorted HSr5 trigonal bipyramids that share corners with twelve equivalent HSr6 octahedra, corners with eight equivalent HSr5 trigonal bipyramids, edges with six equivalent HSr5 trigonal bipyramids, and faces with six equivalent HSr6 octahedra. The corner-sharing octahedra tilt angles range from 31–59°. In the second H1- site, H1- is bonded to six equivalent Sr2+ atoms to form HSr6 octahedra that share corners with twelve equivalent HSr6 octahedra, corners with twelve equivalent HSr5 trigonal bipyramids, edges with six equivalent HSr6 octahedra, faces with two equivalent HSr6 octahedra, and faces with six equivalent HSr5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 51°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrH2 by Materials Project

SrH2 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Sr2+ is bonded in a 3-coordinate geometry to eleven H1- atoms. There are a spread of Sr–H bond distances ranging from 2.37–2.89 Å. There are two inequivalent H1- sites. In the first H1- site, H1- is bonded to six equivalent Sr2+ atoms to form HSr6 octahedra that share corners with twelve equivalent HSr6 octahedra, corners with twelve equivalent HSr5 trigonal bipyramids, edges with six equivalent HSr6 octahedra, faces with two equivalent HSr6 octahedra, and faces with six equivalent HSr5 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 50–51°. In the second H1- site, H1- is bonded to five equivalent Sr2+ atoms to form distorted HSr5 trigonal bipyramids that share corners with twelve equivalent HSr6 octahedra, corners with eight equivalent HSr5 trigonal bipyramids, edges with six equivalent HSr5 trigonal bipyramids, and faces with six equivalent HSr6 octahedra. The corner-sharing octahedra tilt angles range from 30–60°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrH2(CO2)2 by Materials Project

Sr(HCOO)2 crystallizes in the orthorhombic P2_12_12_1 space group. The structure is three-dimensional. Sr2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Sr–O bond distances ranging from 2.53–2.73 Å. There are two inequivalent C2+ sites. In the first C2+ site, C2+ is bonded in a trigonal planar geometry to one H1+ and two O2- atoms. The C–H bond length is 1.11 Å. Both C–O bond lengths are 1.27 Å. In the second C2+ site, C2+ is bonded in a trigonal planar geometry to one H1+ and two O2- atoms. The C–H bond length is 1.11 Å. Both C–O bond lengths are 1.27 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one C2+ atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one C2+ atom. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Sr2+ and one C2+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Sr2+ and one C2+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Sr2+ and one C2+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent Sr2+ and one C2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrH2(CO2)2 by Materials Project

Sr(HCOO)2 crystallizes in the tetragonal P4_12_12 space group. The structure is three-dimensional. Sr2+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Sr–O bond distances ranging from 2.51–2.63 Å. C2+ is bonded in a trigonal planar geometry to one H1+ and two O2- atoms. The C–H bond length is 1.11 Å. There is one shorter (1.26 Å) and one longer (1.28 Å) C–O bond length. H1+ is bonded in a single-bond geometry to one C2+ atom. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Sr2+ and one C2+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one Sr2+ and one C2+ atom.

36 MATERIALS SCIENCE↗