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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ho2Ga8Fe by Materials Project

Ho2FeGa8 crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Ho is bonded to twelve Ga atoms to form HoGa12 cuboctahedra that share corners with eight equivalent HoGa12 cuboctahedra, edges with four equivalent GaHo4Ga8 cuboctahedra, faces with four equivalent GaHo4Ga8 cuboctahedra, and faces with five equivalent HoGa12 cuboctahedra. There are a spread of Ho–Ga bond distances ranging from 2.99–3.03 Å. Fe is bonded in a body-centered cubic geometry to eight Ga atoms. All Fe–Ga bond lengths are 2.47 Å. There are six inequivalent Ga sites. In the first Ga site, Ga is bonded in a distorted square co-planar geometry to four equivalent Ho and four equivalent Ga atoms. All Ga–Ga bond lengths are 3.07 Å. In the second Ga site, Ga is bonded to four equivalent Ho and eight Ga atoms to form distorted GaHo4Ga8 cuboctahedra that share corners with eight equivalent GaHo4Ga8 cuboctahedra, edges with four equivalent HoGa12 cuboctahedra, faces with four equivalent HoGa12 cuboctahedra, and faces with five equivalent GaHo4Ga8 cuboctahedra. All Ga–Ga bond lengths are 2.95 Å. In the third Ga site, Ga is bonded in a 11-coordinate geometry to two equivalent Ho, two equivalent Fe, and seven Ga atoms. There are one shorter (2.54 Å) and four longer (3.00 Å) Ga–Ga bond lengths. In the fourth Ga site, Ga is bonded in a 11-coordinate geometry to two equivalent Ho, two equivalent Fe, and seven Ga atoms. The Ga–Ga bond length is 2.54 Å. In the fifth Ga site, Ga is bonded in a 11-coordinate geometry to two equivalent Ho, two equivalent Fe, and seven Ga atoms. Both Ga–Ho bond lengths are 2.99 Å. There are two shorter (2.95 Å) and four longer (3.00 Å) Ga–Ga bond lengths. In the sixth Ga site, Ga is bonded in a 11-coordinate geometry to two equivalent Ho, two equivalent Fe, and seven Ga atoms. Both Ga–Ho bond lengths are 2.99 Å. Both Ga–Ga bond lengths are 2.95 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho(GaFe)6 by Materials Project

HoFe6Ga6 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. Ho is bonded to twelve Fe and eight Ga atoms to form distorted HoGa8Fe12 hexagonal bipyramids that share corners with eight equivalent HoGa8Fe12 hexagonal bipyramids, faces with twenty-four FeHo2Ga6Fe4 cuboctahedra, and faces with two equivalent HoGa8Fe12 hexagonal bipyramids. There are four shorter (3.26 Å) and eight longer (3.29 Å) Ho–Fe bond lengths. There are a spread of Ho–Ga bond distances ranging from 2.84–2.98 Å. There are two inequivalent Fe sites. In the first Fe site, Fe is bonded to two equivalent Ho, four Fe, and six Ga atoms to form distorted FeHo2Ga6Fe4 cuboctahedra that share corners with fourteen FeHo2Ga6Fe4 cuboctahedra, edges with six FeHo2Ga6Fe4 cuboctahedra, faces with ten FeHo2Ga6Fe4 cuboctahedra, and faces with four equivalent HoGa8Fe12 hexagonal bipyramids. There are two shorter (2.51 Å) and two longer (2.52 Å) Fe–Fe bond lengths. There are a spread of Fe–Ga bond distances ranging from 2.55–2.61 Å. In the second Fe site, Fe is bonded to two equivalent Ho, four equivalent Fe, and six Ga atoms to form distorted FeHo2Ga6Fe4 cuboctahedra that share corners with fourteen FeHo2Ga6Fe4 cuboctahedra, edges with seven FeHo2Ga6Fe4 cuboctahedra, faces with nine FeHo2Ga6Fe4 cuboctahedra, and faces with four equivalent HoGa8Fe12 hexagonal bipyramids. There are a spread of Fe–Ga bond distances ranging from 2.57–2.64 Å. There are five inequivalent Ga sites. In the first Ga site, Ga is bonded in a 10-coordinate geometry to two equivalent Ho, six Fe, and two equivalent Ga atoms. Both Ga–Ga bond lengths are 2.89 Å. In the second Ga site, Ga is bonded in a 10-coordinate geometry to one Ho, six Fe, and three Ga atoms. The Ga–Ga bond length is 2.71 Å. In the third Ga site, Ga is bonded in a 1-coordinate geometry to one Ho, six Fe, and one Ga atom. The Ga–Ho bond length is 2.84 Å. Both Ga–Fe bond lengths are 2.64 Å. The Ga–Ga bond length is 2.83 Å. In the fourth Ga site, Ga is bonded in a 1-coordinate geometry to one Ho, six Fe, and one Ga atom. The Ga–Ho bond length is 2.84 Å. All Ga–Fe bond lengths are 2.61 Å. In the fifth Ga site, Ga is bonded in a 1-coordinate geometry to one Ho, six Fe, and one Ga atom. Both Ga–Fe bond lengths are 2.64 Å. The Ga–Ga bond length is 2.83 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho2Ga3Fe by Materials Project

Ho2FeGa3 crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a 12-coordinate geometry to three equivalent Fe and nine Ga atoms. There are two shorter (3.17 Å) and one longer (3.23 Å) Ho–Fe bond lengths. There are a spread of Ho–Ga bond distances ranging from 3.01–3.24 Å. In the second Ho site, Ho is bonded in a 12-coordinate geometry to three equivalent Fe and nine Ga atoms. All Ho–Fe bond lengths are 3.03 Å. There are a spread of Ho–Ga bond distances ranging from 2.98–3.39 Å. Fe is bonded in a 10-coordinate geometry to six Ho and four Ga atoms. There are a spread of Fe–Ga bond distances ranging from 2.46–2.75 Å. There are three inequivalent Ga sites. In the first Ga site, Ga is bonded in a 10-coordinate geometry to six Ho, one Fe, and three Ga atoms. There are two shorter (2.59 Å) and one longer (3.01 Å) Ga–Ga bond lengths. In the second Ga site, Ga is bonded in a 10-coordinate geometry to six Ho, two equivalent Fe, and two Ga atoms. The Ga–Ga bond length is 2.68 Å. In the third Ga site, Ga is bonded in a 10-coordinate geometry to six Ho, one Fe, and three Ga atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho4Ga12Fe by Materials Project

Ho4FeGa12 crystallizes in the cubic Im-3m space group. The structure is three-dimensional. Ho is bonded to twelve Ga atoms to form HoGa12 cuboctahedra that share corners with twelve equivalent HoGa12 cuboctahedra, edges with twelve equivalent GaHo4Ga8 cuboctahedra, faces with six equivalent HoGa12 cuboctahedra, faces with six equivalent GaHo4Ga8 cuboctahedra, and faces with two equivalent FeGa6 octahedra. There are six shorter (3.03 Å) and six longer (3.04 Å) Ho–Ga bond lengths. Fe is bonded to six equivalent Ga atoms to form FeGa6 octahedra that share corners with twenty-four equivalent GaHo4Ga8 cuboctahedra and faces with eight equivalent HoGa12 cuboctahedra. All Fe–Ga bond lengths are 2.43 Å. There are two inequivalent Ga sites. In the first Ga site, Ga is bonded to four equivalent Ho and eight Ga atoms to form distorted GaHo4Ga8 cuboctahedra that share corners with four equivalent GaHo4Ga8 cuboctahedra, corners with four equivalent FeGa6 octahedra, edges with eight equivalent HoGa12 cuboctahedra, edges with eight equivalent GaHo4Ga8 cuboctahedra, faces with four equivalent HoGa12 cuboctahedra, and faces with six equivalent GaHo4Ga8 cuboctahedra. The corner-sharing octahedral tilt angles are 49°. There are four shorter (2.83 Å) and four longer (3.03 Å) Ga–Ga bond lengths. In the second Ga site, Ga is bonded in a 5-coordinate geometry to four equivalent Ho, one Fe, and four equivalent Ga atoms.

36 MATERIALS SCIENCE↗