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DOE OSTI2020

Materials Data on FeNiSb4 by Materials Project

FeNiSb4 is Marcasite-derived structured and crystallizes in the monoclinic P2/m space group. The structure is three-dimensional. Fe3+ is bonded to six Sb+1.25- atoms to form FeSb6 octahedra that share corners with eight equivalent NiSb6 octahedra and edges with two equivalent FeSb6 octahedra. The corner-sharing octahedra tilt angles range from 52–53°. There are two shorter (2.54 Å) and four longer (2.57 Å) Fe–Sb bond lengths. Ni2+ is bonded to six Sb+1.25- atoms to form NiSb6 octahedra that share corners with eight equivalent FeSb6 octahedra and edges with two equivalent NiSb6 octahedra. The corner-sharing octahedra tilt angles range from 52–53°. All Ni–Sb bond lengths are 2.60 Å. There are two inequivalent Sb+1.25- sites. In the first Sb+1.25- site, Sb+1.25- is bonded in a 4-coordinate geometry to one Fe3+ and two equivalent Ni2+ atoms. In the second Sb+1.25- site, Sb+1.25- is bonded in a 4-coordinate geometry to two equivalent Fe3+ and one Ni2+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ag6SnSb by Materials Project

Ag6SnSb is beta Cu3Ti-derived structured and crystallizes in the orthorhombic Pmm2 space group. The structure is three-dimensional. there are four inequivalent Ag sites. In the first Ag site, Ag is bonded to eight Ag, two equivalent Sn, and two equivalent Sb atoms to form AgAg8Sn2Sb2 cuboctahedra that share corners with four equivalent SbAg12 cuboctahedra, corners with fourteen AgAg8Sn2Sb2 cuboctahedra, edges with two equivalent SbAg12 cuboctahedra, edges with four equivalent SnAg12 cuboctahedra, edges with twelve AgAg8Sn2Sb2 cuboctahedra, faces with two equivalent SnAg12 cuboctahedra, faces with two equivalent SbAg12 cuboctahedra, and faces with sixteen AgAg8Sn2Sb2 cuboctahedra. There are a spread of Ag–Ag bond distances ranging from 2.96–3.09 Å. Both Ag–Sn bond lengths are 3.02 Å. There are one shorter (3.02 Å) and one longer (3.09 Å) Ag–Sb bond lengths. In the second Ag site, Ag is bonded to eight Ag, two equivalent Sn, and two equivalent Sb atoms to form AgAg8Sn2Sb2 cuboctahedra that share corners with four equivalent SnAg12 cuboctahedra, corners with fourteen AgAg8Sn2Sb2 cuboctahedra, edges with two equivalent SnAg12 cuboctahedra, edges with four equivalent SbAg12 cuboctahedra, edges with twelve AgAg8Sn2Sb2 cuboctahedra, faces with two equivalent SnAg12 cuboctahedra, faces with two equivalent SbAg12 cuboctahedra, and faces with sixteen AgAg8Sn2Sb2 cuboctahedra. There are a spread of Ag–Ag bond distances ranging from 3.00–3.12 Å. There are one shorter (3.01 Å) and one longer (3.08 Å) Ag–Sn bond lengths. Both Ag–Sb bond lengths are 3.03 Å. In the third Ag site, Ag is bonded to eight Ag, two equivalent Sn, and two equivalent Sb atoms to form AgAg8Sn2Sb2 cuboctahedra that share corners with eight equivalent SnAg12 cuboctahedra, corners with ten AgAg8Sn2Sb2 cuboctahedra, edges with eighteen AgAg8Sn2Sb2 cuboctahedra, faces with two equivalent SnAg12 cuboctahedra, faces with four equivalent SbAg12 cuboctahedra, and faces with fourteen AgAg8Sn2Sb2 cuboctahedra. Both Ag–Sn bond lengths are 3.07 Å. Both Ag–Sb bond lengths are 3.02 Å. In the fourth Ag site, Ag is bonded to eight Ag, two equivalent Sn, and two equivalent Sb atoms to form AgAg8Sn2Sb2 cuboctahedra that share corners with eight equivalent SbAg12 cuboctahedra, corners with ten AgAg8Sn2Sb2 cuboctahedra, edges with eighteen AgAg8Sn2Sb2 cuboctahedra, faces with two equivalent SbAg12 cuboctahedra, faces with four equivalent SnAg12 cuboctahedra, and faces with fourteen AgAg8Sn2Sb2 cuboctahedra. Both Ag–Sn bond lengths are 3.01 Å. Both Ag–Sb bond lengths are 3.07 Å. Sn is bonded to twelve Ag atoms to form SnAg12 cuboctahedra that share corners with two equivalent SnAg12 cuboctahedra, corners with sixteen AgAg8Sn2Sb2 cuboctahedra, edges with two equivalent SnAg12 cuboctahedra, edges with four equivalent SbAg12 cuboctahedra, edges with twelve AgAg8Sn2Sb2 cuboctahedra, faces with two equivalent SnAg12 cuboctahedra, faces with four equivalent SbAg12 cuboctahedra, and faces with fourteen AgAg8Sn2Sb2 cuboctahedra. Sb is bonded to twelve Ag atoms to form SbAg12 cuboctahedra that share corners with two equivalent SbAg12 cuboctahedra, corners with sixteen AgAg8Sn2Sb2 cuboctahedra, edges with two equivalent SbAg12 cuboctahedra, edges with four equivalent SnAg12 cuboctahedra, edges with twelve AgAg8Sn2Sb2 cuboctahedra, faces with two equivalent SbAg12 cuboctahedra, faces with four equivalent SnAg12 cuboctahedra, and faces with fourteen AgAg8Sn2Sb2 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mn2InSbPd4 by Materials Project

Mn2Pd4InSb is Heusler-derived structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Mn is bonded in a body-centered cubic geometry to eight Pd and three equivalent Sb atoms. There are a spread of Mn–Pd bond distances ranging from 2.76–2.82 Å. All Mn–Sb bond lengths are 3.24 Å. There are three inequivalent Pd sites. In the first Pd site, Pd is bonded in a body-centered cubic geometry to four equivalent Mn, three equivalent In, and one Sb atom. All Pd–In bond lengths are 2.79 Å. The Pd–Sb bond length is 2.78 Å. In the second Pd site, Pd is bonded in a body-centered cubic geometry to four equivalent Mn, one In, and three equivalent Sb atoms. The Pd–In bond length is 2.79 Å. All Pd–Sb bond lengths are 2.79 Å. In the third Pd site, Pd is bonded in a body-centered cubic geometry to four equivalent Mn, three equivalent In, and one Sb atom. All Pd–In bond lengths are 2.79 Å. The Pd–Sb bond length is 2.78 Å. In is bonded in a body-centered cubic geometry to eight Pd atoms. Sb is bonded in a distorted body-centered cubic geometry to six equivalent Mn and eight Pd atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on FeCoSb4 by Materials Project

FeCoSb4 crystallizes in the monoclinic P2/m space group. The structure is three-dimensional. Fe3+ is bonded to six Sb+1.25- atoms to form FeSb6 octahedra that share corners with eight equivalent CoSb6 octahedra and edges with two equivalent FeSb6 octahedra. The corner-sharing octahedral tilt angles are 51°. There are two shorter (2.55 Å) and four longer (2.57 Å) Fe–Sb bond lengths. Co2+ is bonded to six Sb+1.25- atoms to form CoSb6 octahedra that share corners with eight equivalent FeSb6 octahedra and edges with two equivalent CoSb6 octahedra. The corner-sharing octahedral tilt angles are 51°. All Co–Sb bond lengths are 2.57 Å. There are two inequivalent Sb+1.25- sites. In the first Sb+1.25- site, Sb+1.25- is bonded in a 4-coordinate geometry to two equivalent Fe3+ and one Co2+ atom. In the second Sb+1.25- site, Sb+1.25- is bonded in a 4-coordinate geometry to one Fe3+ and two equivalent Co2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CrFeSb4 by Materials Project

CrFeSb4 crystallizes in the monoclinic P2/m space group. The structure is three-dimensional. Cr3+ is bonded to six Sb+1.50- atoms to form CrSb6 octahedra that share corners with eight equivalent FeSb6 octahedra and edges with two equivalent CrSb6 octahedra. The corner-sharing octahedra tilt angles range from 50–52°. There are four shorter (2.70 Å) and two longer (2.71 Å) Cr–Sb bond lengths. Fe3+ is bonded to six Sb+1.50- atoms to form FeSb6 octahedra that share corners with eight equivalent CrSb6 octahedra and edges with two equivalent FeSb6 octahedra. The corner-sharing octahedra tilt angles range from 50–52°. There are two shorter (2.56 Å) and four longer (2.58 Å) Fe–Sb bond lengths. There are two inequivalent Sb+1.50- sites. In the first Sb+1.50- site, Sb+1.50- is bonded in a 3-coordinate geometry to one Cr3+ and two equivalent Fe3+ atoms. In the second Sb+1.50- site, Sb+1.50- is bonded in a 4-coordinate geometry to two equivalent Cr3+ and one Fe3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on U5Sb4 by Materials Project

U5Sb4 crystallizes in the hexagonal P6_3/mcm space group. The structure is three-dimensional. there are two inequivalent U sites. In the first U site, U is bonded in a 8-coordinate geometry to two equivalent U and six equivalent Sb atoms. Both U–U bond lengths are 3.07 Å. All U–Sb bond lengths are 3.30 Å. In the second U site, U is bonded to seven Sb atoms to form a mixture of distorted face, edge, and corner-sharing USb7 pentagonal bipyramids. There are a spread of U–Sb bond distances ranging from 3.09–3.18 Å. There are two inequivalent Sb sites. In the first Sb site, Sb is bonded to six equivalent U atoms to form distorted face-sharing SbU6 octahedra. In the second Sb site, Sb is bonded in a 9-coordinate geometry to nine U atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mn3Ni4Sb by Materials Project

Mn3Ni4Sb is Tungsten-derived structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are two inequivalent Mn sites. In the first Mn site, Mn is bonded in a 8-coordinate geometry to eight Ni and three equivalent Sb atoms. There are a spread of Mn–Ni bond distances ranging from 2.47–2.79 Å. All Mn–Sb bond lengths are 3.03 Å. In the second Mn site, Mn is bonded in a body-centered cubic geometry to eight Ni atoms. There are two shorter (2.53 Å) and six longer (2.55 Å) Mn–Ni bond lengths. There are three inequivalent Ni sites. In the first Ni site, Ni is bonded in a distorted body-centered cubic geometry to seven Mn and one Sb atom. The Ni–Sb bond length is 2.69 Å. In the second Ni site, Ni is bonded in a body-centered cubic geometry to five Mn and three equivalent Sb atoms. All Ni–Sb bond lengths are 2.60 Å. In the third Ni site, Ni is bonded in a distorted body-centered cubic geometry to seven Mn and one Sb atom. The Ni–Sb bond length is 2.69 Å. Sb is bonded in a 8-coordinate geometry to six equivalent Mn and eight Ni atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NaSb(OF2)2 by Materials Project

NaSb(OF2)2 is Upper Bainite-derived structured and crystallizes in the monoclinic Cc space group. The structure is three-dimensional. Na is bonded to two O and four F atoms to form NaO2F4 octahedra that share corners with six equivalent SbO2F4 octahedra. The corner-sharing octahedra tilt angles range from 41–56°. There are one shorter (2.59 Å) and one longer (2.66 Å) Na–O bond lengths. There are a spread of Na–F bond distances ranging from 2.31–2.37 Å. Sb is bonded to two O and four F atoms to form SbO2F4 octahedra that share corners with six equivalent NaO2F4 octahedra. The corner-sharing octahedra tilt angles range from 41–56°. There is one shorter (1.97 Å) and one longer (1.98 Å) Sb–O bond length. There are a spread of Sb–F bond distances ranging from 1.93–1.96 Å. There are two inequivalent O sites. In the first O site, O is bonded in a bent 120 degrees geometry to one Na and one Sb atom. In the second O site, O is bonded in a bent 120 degrees geometry to one Na and one Sb atom. There are four inequivalent F sites. In the first F site, F is bonded in a distorted bent 120 degrees geometry to one Na and one Sb atom. In the second F site, F is bonded in a bent 150 degrees geometry to one Na and one Sb atom. In the third F site, F is bonded in a bent 150 degrees geometry to one Na and one Sb atom. In the fourth F site, F is bonded in a distorted bent 120 degrees geometry to one Na and one Sb atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Hf2Sb3Pd by Materials Project

Hf2PdSb3 crystallizes in the tetragonal P-4m2 space group. The structure is three-dimensional. Hf is bonded in a 9-coordinate geometry to two equivalent Pd and seven Sb atoms. Both Hf–Pd bond lengths are 2.99 Å. There are a spread of Hf–Sb bond distances ranging from 2.98–3.07 Å. Pd is bonded to four equivalent Hf and four equivalent Sb atoms to form distorted PdHf4Sb4 hexagonal bipyramids that share corners with four equivalent PdHf4Sb4 hexagonal bipyramids, edges with four equivalent SbHf4Pd4 hexagonal bipyramids, and faces with four equivalent PdHf4Sb4 hexagonal bipyramids. All Pd–Sb bond lengths are 2.79 Å. There are two inequivalent Sb sites. In the first Sb site, Sb is bonded in a 5-coordinate geometry to five equivalent Hf atoms. In the second Sb site, Sb is bonded to four equivalent Hf and four equivalent Pd atoms to form distorted SbHf4Pd4 hexagonal bipyramids that share corners with four equivalent SbHf4Pd4 hexagonal bipyramids, edges with four equivalent PdHf4Sb4 hexagonal bipyramids, and faces with four equivalent SbHf4Pd4 hexagonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ga3Sb7(S4Cl7)2 by Materials Project

GaCl4Ga2Sb7(S4Cl5)2 crystallizes in the monoclinic P2_1 space group. The structure is zero-dimensional and consists of two Ga2Sb7(S4Cl5)2 clusters and two GaCl4 clusters. In each Ga2Sb7(S4Cl5)2 cluster, there are two inequivalent Ga3+ sites. In the first Ga3+ site, Ga3+ is bonded in a tetrahedral geometry to four Cl1- atoms. There are a spread of Ga–Cl bond distances ranging from 2.18–2.23 Å. In the second Ga3+ site, Ga3+ is bonded in a tetrahedral geometry to four Cl1- atoms. There are a spread of Ga–Cl bond distances ranging from 2.18–2.24 Å. There are seven inequivalent Sb3+ sites. In the first Sb3+ site, Sb3+ is bonded in a distorted octahedral geometry to six S2- atoms. There are a spread of Sb–S bond distances ranging from 2.65–3.02 Å. In the second Sb3+ site, Sb3+ is bonded in a 3-coordinate geometry to three S2- atoms. There are a spread of Sb–S bond distances ranging from 2.49–2.59 Å. In the third Sb3+ site, Sb3+ is bonded in a 3-coordinate geometry to three S2- atoms. There are a spread of Sb–S bond distances ranging from 2.50–2.58 Å. In the fourth Sb3+ site, Sb3+ is bonded in a 5-coordinate geometry to three S2- and two Cl1- atoms. There are a spread of Sb–S bond distances ranging from 2.49–3.18 Å. There are one shorter (2.40 Å) and one longer (3.23 Å) Sb–Cl bond lengths. In the fifth Sb3+ site, Sb3+ is bonded in a 3-coordinate geometry to three S2- atoms. There are a spread of Sb–S bond distances ranging from 2.51–2.57 Å. In the sixth Sb3+ site, Sb3+ is bonded in a 3-coordinate geometry to three S2- atoms. There are a spread of Sb–S bond distances ranging from 2.48–2.61 Å. In the seventh Sb3+ site, Sb3+ is bonded in a 5-coordinate geometry to three S2- and two Cl1- atoms. There are a spread of Sb–S bond distances ranging from 2.50–3.15 Å. There are one shorter (2.42 Å) and one longer (3.28 Å) Sb–Cl bond lengths. There are eight inequivalent S2- sites. In the first S2- site, S2- is bonded in a 3-coordinate geometry to three Sb3+ atoms. In the second S2- site, S2- is bonded in a 2-coordinate geometry to three Sb3+ atoms. In the third S2- site, S2- is bonded in a 3-coordinate geometry to three Sb3+ atoms. In the fourth S2- site, S2- is bonded in a 2-coordinate geometry to three Sb3+ atoms. In the fifth S2- site, S2- is bonded in a 3-coordinate geometry to three Sb3+ atoms. In the sixth S2- site, S2- is bonded in a 2-coordinate geometry to three Sb3+ atoms. In the seventh S2- site, S2- is bonded in a 3-coordinate geometry to three Sb3+ atoms. In the eighth S2- site, S2- is bonded in a 2-coordinate geometry to three Sb3+ atoms. There are ten inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a single-bond geometry to one Sb3+ atom. In the second Cl1- site, Cl1- is bonded in a single-bond geometry to one Sb3+ atom. In the third Cl1- site, Cl1- is bonded in a single-bond geometry to one Ga3+ atom. In the fourth Cl1- site, Cl1- is bonded in a single-bond geometry to one Ga3+ and one Sb3+ atom. In the fifth Cl1- site, Cl1- is bonded in a single-bond geometry to one Ga3+ atom. In the sixth Cl1- site, Cl1- is bonded in a single-bond geometry to one Ga3+ atom. In the seventh Cl1- site, Cl1- is bonded in a single-bond geometry to one Ga3+ atom. In the eighth Cl1- site, Cl1- is bonded in a single-bond geometry to one Ga3+ atom. In the ninth Cl1- site, Cl1- is bonded in a single-bond geometry to one Ga3+ and one Sb3+ atom. In the tenth Cl1- site, Cl1- is bonded in a single-bond geometry to one Ga3+ atom. In each GaCl4 cluster, Ga3+ is bonded in a tetrahedral geometry to four Cl1- atoms. There are a spread of Ga–Cl bond distances ranging from 2.19–2.24 Å. There are four inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a single-bond geometry to one Ga3+ atom. In the second Cl1- site, Cl1- is bonded in a single-bond geometry to one Ga3+ atom. In the third Cl1- site, Cl1- is bonded in a single-bond geometry to one Ga3+ atom. In the fourth Cl1- site, Cl1- is bonded in a single-bond geometry to one Ga3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HfZrCoSb2Rh by Materials Project

HfZrRhCoSb2 is half-Heusler-derived structured and crystallizes in the trigonal R3m space group. The structure is three-dimensional. Hf is bonded in a body-centered cubic geometry to three equivalent Rh, one Co, and four Sb atoms. All Hf–Rh bond lengths are 2.80 Å. The Hf–Co bond length is 2.79 Å. There are three shorter (2.80 Å) and one longer (2.82 Å) Hf–Sb bond lengths. Zr is bonded in a body-centered cubic geometry to one Rh, three equivalent Co, and four Sb atoms. The Zr–Rh bond length is 2.83 Å. All Zr–Co bond lengths are 2.80 Å. There are one shorter (2.80 Å) and three longer (2.81 Å) Zr–Sb bond lengths. Rh is bonded to three equivalent Hf and one Zr atom to form distorted RhHf3Zr tetrahedra that share corners with four equivalent SbHf3Zr tetrahedra, corners with six equivalent RhHf3Zr tetrahedra, corners with six equivalent CoHfZr3 tetrahedra, and edges with six SbHf3Zr tetrahedra. Co is bonded to one Hf and three equivalent Zr atoms to form distorted CoHfZr3 tetrahedra that share corners with four equivalent SbHfZr3 tetrahedra, corners with six equivalent RhHf3Zr tetrahedra, corners with six equivalent CoHfZr3 tetrahedra, and edges with six SbHf3Zr tetrahedra. There are two inequivalent Sb sites. In the first Sb site, Sb is bonded to three equivalent Hf and one Zr atom to form distorted SbHf3Zr tetrahedra that share corners with four equivalent RhHf3Zr tetrahedra, corners with twelve SbHf3Zr tetrahedra, edges with three equivalent RhHf3Zr tetrahedra, and edges with three equivalent CoHfZr3 tetrahedra. In the second Sb site, Sb is bonded to one Hf and three equivalent Zr atoms to form distorted SbHfZr3 tetrahedra that share corners with four equivalent CoHfZr3 tetrahedra, corners with twelve SbHf3Zr tetrahedra, edges with three equivalent RhHf3Zr tetrahedra, and edges with three equivalent CoHfZr3 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho5Sb2Pd by Materials Project

Ho5PdSb2 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are four inequivalent Ho sites. In the first Ho site, Ho is bonded in a 5-coordinate geometry to one Pd and four equivalent Sb atoms. The Ho–Pd bond length is 2.87 Å. There are two shorter (3.15 Å) and two longer (3.16 Å) Ho–Sb bond lengths. In the second Ho site, Ho is bonded to one Pd and four equivalent Sb atoms to form a mixture of distorted edge and corner-sharing HoSb4Pd square pyramids. The Ho–Pd bond length is 2.99 Å. There are two shorter (3.12 Å) and two longer (3.13 Å) Ho–Sb bond lengths. In the third Ho site, Ho is bonded to one Pd and four equivalent Sb atoms to form a mixture of distorted edge and corner-sharing HoSb4Pd trigonal bipyramids. The Ho–Pd bond length is 2.86 Å. There are two shorter (3.19 Å) and two longer (3.21 Å) Ho–Sb bond lengths. In the fourth Ho site, Ho is bonded in a 2-coordinate geometry to two equivalent Pd and three equivalent Sb atoms. There are one shorter (2.84 Å) and one longer (2.96 Å) Ho–Pd bond lengths. There are a spread of Ho–Sb bond distances ranging from 3.30–3.56 Å. Pd is bonded in a 7-coordinate geometry to seven Ho atoms. Sb is bonded in a 9-coordinate geometry to nine Ho atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Pr5CoSb2 by Materials Project

Pr5CoSb2 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are four inequivalent Pr sites. In the first Pr site, Pr is bonded to one Co and four equivalent Sb atoms to form a mixture of distorted face, edge, and corner-sharing PrCoSb4 trigonal bipyramids. The Pr–Co bond length is 2.85 Å. There are two shorter (3.26 Å) and two longer (3.30 Å) Pr–Sb bond lengths. In the second Pr site, Pr is bonded to one Co and four equivalent Sb atoms to form a mixture of distorted edge and corner-sharing PrCoSb4 trigonal bipyramids. The Pr–Co bond length is 2.98 Å. There are two shorter (3.31 Å) and two longer (3.37 Å) Pr–Sb bond lengths. In the third Pr site, Pr is bonded to one Co and four equivalent Sb atoms to form a mixture of distorted face, edge, and corner-sharing PrCoSb4 square pyramids. The Pr–Co bond length is 3.22 Å. There are two shorter (3.25 Å) and two longer (3.27 Å) Pr–Sb bond lengths. In the fourth Pr site, Pr is bonded in a 4-coordinate geometry to two equivalent Co and two equivalent Sb atoms. There are one shorter (2.80 Å) and one longer (3.00 Å) Pr–Co bond lengths. There are one shorter (3.41 Å) and one longer (3.46 Å) Pr–Sb bond lengths. Co is bonded to seven Pr atoms to form distorted edge-sharing CoPr7 pentagonal bipyramids. Sb is bonded in a 8-coordinate geometry to eight Pr atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg6NiSb by Materials Project

Mg6NiSb crystallizes in the orthorhombic Amm2 space group. The structure is three-dimensional. there are four inequivalent Mg sites. In the first Mg site, Mg is bonded to eight Mg, two equivalent Ni, and two equivalent Sb atoms to form distorted MgMg8Ni2Sb2 cuboctahedra that share corners with four equivalent NiMg10Sb2 cuboctahedra, corners with fourteen MgMg8Ni2Sb2 cuboctahedra, edges with two equivalent NiMg10Sb2 cuboctahedra, edges with four equivalent SbMg10Ni2 cuboctahedra, edges with twelve MgMg8Ni2Sb2 cuboctahedra, faces with two equivalent NiMg10Sb2 cuboctahedra, faces with two equivalent SbMg10Ni2 cuboctahedra, and faces with sixteen MgMg8Ni2Sb2 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.02–3.14 Å. There are one shorter (3.03 Å) and one longer (3.12 Å) Mg–Ni bond lengths. Both Mg–Sb bond lengths are 3.11 Å. In the second Mg site, Mg is bonded to ten Mg and two equivalent Ni atoms to form distorted MgMg10Ni2 cuboctahedra that share corners with four equivalent NiMg10Sb2 cuboctahedra, corners with fourteen MgMg8Ni2Sb2 cuboctahedra, edges with two equivalent NiMg10Sb2 cuboctahedra, edges with sixteen MgMg8Ni2Sb2 cuboctahedra, faces with two equivalent NiMg10Sb2 cuboctahedra, faces with six equivalent SbMg10Ni2 cuboctahedra, and faces with twelve MgMg8Ni2Sb2 cuboctahedra. There are two shorter (3.07 Å) and four longer (3.09 Å) Mg–Mg bond lengths. Both Mg–Ni bond lengths are 3.08 Å. In the third Mg site, Mg is bonded to eight Mg, two equivalent Ni, and two equivalent Sb atoms to form distorted MgMg8Ni2Sb2 cuboctahedra that share corners with four equivalent SbMg10Ni2 cuboctahedra, corners with fourteen MgMg8Ni2Sb2 cuboctahedra, edges with two equivalent SbMg10Ni2 cuboctahedra, edges with four equivalent NiMg10Sb2 cuboctahedra, edges with twelve MgMg8Ni2Sb2 cuboctahedra, faces with two equivalent NiMg10Sb2 cuboctahedra, faces with two equivalent SbMg10Ni2 cuboctahedra, and faces with sixteen MgMg8Ni2Sb2 cuboctahedra. There are a spread of Mg–Mg bond distances ranging from 3.00–3.16 Å. Both Mg–Ni bond lengths are 3.05 Å. There are one shorter (2.99 Å) and one longer (3.17 Å) Mg–Sb bond lengths. In the fourth Mg site, Mg is bonded to ten Mg and two equivalent Sb atoms to form distorted MgMg10Sb2 cuboctahedra that share corners with four equivalent SbMg10Ni2 cuboctahedra, corners with fourteen MgMg8Ni2Sb2 cuboctahedra, edges with two equivalent SbMg10Ni2 cuboctahedra, edges with sixteen MgMg8Ni2Sb2 cuboctahedra, faces with two equivalent SbMg10Ni2 cuboctahedra, faces with six equivalent NiMg10Sb2 cuboctahedra, and faces with twelve MgMg8Ni2Sb2 cuboctahedra. Both Mg–Sb bond lengths are 3.08 Å. Ni is bonded to ten Mg and two equivalent Sb atoms to form NiMg10Sb2 cuboctahedra that share corners with six equivalent NiMg10Sb2 cuboctahedra, corners with twelve MgMg8Ni2Sb2 cuboctahedra, edges with four equivalent SbMg10Ni2 cuboctahedra, edges with fourteen MgMg8Ni2Sb2 cuboctahedra, faces with two equivalent NiMg10Sb2 cuboctahedra, faces with two equivalent SbMg10Ni2 cuboctahedra, and faces with sixteen MgMg8Ni2Sb2 cuboctahedra. Both Ni–Sb bond lengths are 3.06 Å. Sb is bonded to ten Mg and two equivalent Ni atoms to form SbMg10Ni2 cuboctahedra that share corners with six equivalent SbMg10Ni2 cuboctahedra, corners with twelve MgMg8Ni2Sb2 cuboctahedra, edges with four equivalent NiMg10Sb2 cuboctahedra, edges with fourteen MgMg8Ni2Sb2 cuboctahedra, faces with two equivalent NiMg10Sb2 cuboctahedra, faces with two equivalent SbMg10Ni2 cuboctahedra, and faces with sixteen MgMg8Ni2Sb2 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2025

Facet-Dependent Doping and Dopant-Dependent Faceting in Si-Doped GaAsSb Nanowires

Here, we correlate the spatial distributions of Si, Sb, and rotational twins in Si-doped GaAs 1-x Sb x nanowires. GaAs 1-x Sb x nanowires were grown epitaxially on Si(111) substrates by tuning process conditions to achieve repeated nucleation of rotational twins and growth along the [111]B direction; dilute Sb and Si fluxes were chosen to create a sufficient twin density to achieve high yield while avoiding growth of the wurtzite phase. While the impact of Si and Sb on twin density and nanowire growth rate has been previously reported, the facet-dependent incorporation of these species has not been established. Scanning transmission electron microscopy was used to confirm that Sb incorporates preferentially on the (111)B facets relative to {1 ̅1 ̅0} facets prior to nucleation of a rotational twin. With periodic twinning, this facet dependence leads to alternating regions of enriched and depleted Sb concentration attributed to a growth rate-dependent Sb-As-exchange mechanism. Atom probe tomography measurements establish that while Si doping is not perturbed by twinning on (111)B facets, Si and Sb concentrations are anti-correlated for growth on non-(111)B facets. Density functional theory calculations underpin a thermodynamic model that explains the observed anisotropies in dopant incorporation.

36 MATERIALS SCIENCE↗
DOE OSTI2023

Vibrations and Phase Stability in Mixed Valence Antimony Oxide

α-Sb 2 O 4 (cervantite) and β-Sb 2 O 4 (clinocervantite) are mixed valence compounds with equal proportions of Sb III and Sb V as represented in the formula Sb III Sb V O 4 . Their structure and properties can be difficult to calculate owing to the Sb III lone-pair electrons. Here, we present a study of the lattice dynamics and vibrational properties using a combination of inelastic neutron scattering, Mössbauer spectroscopy, nuclear inelastic scattering, and density functional theory (DFT) calculations. DFT calculations that account for lone-pair electrons match the experimental densities of phonon states. Mössbauer spectroscopy reveals the β phase to be significantly harder than the α phase. Calculations with O vacancies reveal the possibility for nonstoichiometric proportions of Sb III and Sb V in both phases. An open question is what drives the stability of the α phase over the β phase, as the latter shows pronounced kinetic stability and lower symmetry despite being in the high-temperature phase. Since the vibrational entropy difference is small, it is unlikely to stabilize the α phase. In conclusion, our results suggest that the α phase is more stable only because the material is not fully stoichiometric.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2025

Long‐Term Impacts of Global Solid Biofuel Emissions on Ambient Air Quality and Human Health for 2000–2019

Globally, solid biofuels (SB) have been widely used for household cooking and energy production for decades due to electricity shortages and socio-economic barriers to adopting renewable energy alternatives. This has detrimental effects on air quality, human health, and climate through trace gas and aerosol emissions. Despite numerous studies, the long-term consequences of SB emissions remain poorly understood. Here, we use the Community Earth System Model and the Community Emissions Data System emission inventory to investigate the SB emission impacts on air quality and human health for 2000–2019. Global SB emission increased the ambient PM 2.5 (particulate matter with aerodynamic diameters ≤2.5 μm) and ozone (O 3 ) concentrations up to 23.61 μg/m 3 and 13.69 ppbv, with significant effects found in India, China, and the Rest of Asia (ROA). Our study estimates total annual premature deaths (APDs) associated with global SB-attributable PM 2.5 and O 3 exposure as 1.11 million [95% confidence interval (95% CI): 1.00–1.22 million] in 2000 up to 1.43 million (95% CI: 1.30–1.56 million) in 2019. China's SB emissions and associated APDs have reduced substantially, whereas India and ROA had a major leap in both estimates in 2019 compared to 2000. China's progress in cutting residential SB emissions accounts for its improvements. Our study urges the reduction of SB usage and emissions to potentially improve overall air quality and human health conditions, especially in highly populated, low- and middle-income countries, where the poor air quality and associated health burden attributable to SB emissions are estimated to be higher.

O 3↗
DOE OSTI2023

Ab initio study of mechanical and thermal properties of GeTe-based and PbSe-based high-entropy chalcogenides

GeTe-based and PbSe-based high-entropy compounds have outstanding thermoelectric (TE) performance and crucial applications in mid and high temperatures. Recently, the optimization of TE performance of high-entropy compounds has been focused on reducing thermal conductivity by strengthening the phonon scattering process to improve TE performance. We report a first-principles investigation on nine GeTe-based high-entropy chalcogenide solid solutions constituted of eight metallic elements (Ag, Pb, Sb, Bi, Cu, Cd, Mn, and Sn) and 13 PbSe-based high-entropy chalcogenide solid solutions: Pb 0.99-y Sb 0.012 Sn y Se 1-2x Te x S x (x = 0.1, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, and y = 0) and Pb 0.99-y Sb 0.012 Sn y Se 1-2x Te x S x (y = 0.05, 0.1, 0.15, 0.2, 0.25 and x = 0.25). We have investigated the mechanical properties focusing on Debye temperature (Θ D ), thermal conductivity (κ), Grüneisen parameter (γ α ), dominant phonon wavelength (λ dom ), and melting temperature (T m ). We find that the lattice thermal conductivity is significantly reduced when GeTe is alloyed into the following compositions: Ge 0.75 Sb 0.13 Pb 0.12 Te, Ge 0.61 Ag 0.11 Sb 0.13 Pb 0.12 Bi 0.01 Te, and Ge 0.61 Ag 0.11 Sb 0.13 Pb 0.12 Mn 0.05 Bi 0.01 Te. This reduction is due to the mass increase and strain fluctuations. The results also show that Ge 0.61 Ag 0.11 Sb 0.13 Pb 0.12 Bi 0.01 Te solid solution has the lowest Young’s modulus (30.362 GPa), bulk and shear moduli (18.626 and 12.359 GPa), average sound velocity (1653.128 m/sec), Debye temperature (151.689 K), lattice thermal conductivity (0.574 W.m –1 .K –1 ), dominant phonon wavelength (0.692 Å), and melting temperature (535.91 K). Moreover, Ge 0.61 Ag 0.11 Sb 0.13 Pb 0.12 Bi 0.01 Te has the highest Grüneisen parameter with a reduced and temperature-independent lattice thermal conductivity. The positive correlation between Θ D and κ is revealed. Alloying of PbSe-based high-entropy by Sb, Sn, Te, and S atoms at the Se and Pb sites resulted in much higher shear strains resulted in the reduction of phonon velocity, a reduced Θ D , and a lower lattice thermal conductivity.

74 ATOMIC AND MOLECULAR PHYSICS↗