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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Sc3(Ga3Fe)2 by Materials Project

Sc3(FeGa3)2 is Bergman Structure: Mg32(Al,Zn)49 Bergman-like structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Sc sites. In the first Sc site, Sc is bonded in a 12-coordinate geometry to three Fe and nine Ga atoms. There are a spread of Sc–Fe bond distances ranging from 2.91–3.13 Å. There are a spread of Sc–Ga bond distances ranging from 2.84–3.10 Å. In the second Sc site, Sc is bonded in a 1-coordinate geometry to two Fe and eleven Ga atoms. There are one shorter (3.05 Å) and one longer (3.23 Å) Sc–Fe bond lengths. There are a spread of Sc–Ga bond distances ranging from 2.73–3.36 Å. There are two inequivalent Fe sites. In the first Fe site, Fe is bonded to five Sc, one Fe, and six Ga atoms to form FeSc5Ga6Fe cuboctahedra that share corners with five equivalent FeSc3Ga8Fe cuboctahedra, edges with two equivalent FeSc5Ga6Fe cuboctahedra, and faces with two equivalent FeSc3Ga8Fe cuboctahedra. The Fe–Fe bond length is 2.55 Å. There are a spread of Fe–Ga bond distances ranging from 2.40–2.61 Å. In the second Fe site, Fe is bonded to three Sc, one Fe, and eight Ga atoms to form a mixture of distorted corner and face-sharing FeSc3Ga8Fe cuboctahedra. There are a spread of Fe–Ga bond distances ranging from 2.61–2.68 Å. There are four inequivalent Ga sites. In the first Ga site, Ga is bonded in a 12-coordinate geometry to four Sc, three Fe, and four Ga atoms. There are a spread of Ga–Ga bond distances ranging from 2.72–2.97 Å. In the second Ga site, Ga is bonded in a 11-coordinate geometry to five Sc, two Fe, and four Ga atoms. Both Ga–Ga bond lengths are 2.61 Å. In the third Ga site, Ga is bonded in a 12-coordinate geometry to five Sc, three Fe, and four Ga atoms. In the fourth Ga site, Ga is bonded in a 9-coordinate geometry to six Sc, one Fe, and two equivalent Ga atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ScGa5Fe by Materials Project

ScFeGa5 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Sc is bonded to twelve Ga atoms to form ScGa12 cuboctahedra that share corners with four equivalent ScGa12 cuboctahedra, faces with four equivalent ScGa12 cuboctahedra, and faces with four equivalent GaSc4Ga8 cuboctahedra. There are eight shorter (2.92 Å) and four longer (2.94 Å) Sc–Ga bond lengths. Fe is bonded in a body-centered cubic geometry to eight Ga atoms. All Fe–Ga bond lengths are 2.46 Å. There are five inequivalent Ga sites. In the first Ga site, Ga is bonded in a 4-coordinate geometry to two equivalent Sc, two equivalent Fe, and seven Ga atoms. There are a spread of Ga–Ga bond distances ranging from 2.62–2.94 Å. In the second Ga site, Ga is bonded in a 4-coordinate geometry to two equivalent Sc, two equivalent Fe, and seven Ga atoms. There are two shorter (2.92 Å) and four longer (2.94 Å) Ga–Ga bond lengths. In the third Ga site, Ga is bonded in a 4-coordinate geometry to two equivalent Sc, two equivalent Fe, and seven Ga atoms. There are one shorter (2.62 Å) and two longer (2.92 Å) Ga–Ga bond lengths. In the fourth Ga site, Ga is bonded in a 4-coordinate geometry to two equivalent Sc, two equivalent Fe, and seven Ga atoms. Both Ga–Ga bond lengths are 2.92 Å. In the fifth Ga site, Ga is bonded to four equivalent Sc and eight Ga atoms to form GaSc4Ga8 cuboctahedra that share corners with four equivalent GaSc4Ga8 cuboctahedra, faces with four equivalent ScGa12 cuboctahedra, and faces with four equivalent GaSc4Ga8 cuboctahedra.

36 MATERIALS SCIENCE↗