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DOE OSTI2020

Materials Data on Eu(AlGa)2 by Materials Project

EuAl2Ga2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Eu is bonded in a 8-coordinate geometry to eight equivalent Ga and eight equivalent Al atoms. All Eu–Ga bond lengths are 3.31 Å. All Eu–Al bond lengths are 3.50 Å. Ga is bonded in a 9-coordinate geometry to four equivalent Eu, one Ga, and four equivalent Al atoms. The Ga–Ga bond length is 2.51 Å. All Ga–Al bond lengths are 2.63 Å. Al is bonded to four equivalent Eu and four equivalent Ga atoms to form a mixture of distorted corner, edge, and face-sharing AlEu4Ga4 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu2Al3Ga by Materials Project

Eu2GaAl3 is Cubic Laves-derived structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Eu is bonded in a 12-coordinate geometry to three equivalent Ga and nine equivalent Al atoms. All Eu–Ga bond lengths are 3.32 Å. There are six shorter (3.34 Å) and three longer (3.36 Å) Eu–Al bond lengths. Ga is bonded to six equivalent Eu and six equivalent Al atoms to form GaEu6Al6 cuboctahedra that share corners with six equivalent GaEu6Al6 cuboctahedra, corners with twelve equivalent AlEu6Al4Ga2 cuboctahedra, edges with six equivalent GaEu6Al6 cuboctahedra, and faces with eighteen equivalent AlEu6Al4Ga2 cuboctahedra. All Ga–Al bond lengths are 2.86 Å. Al is bonded to six equivalent Eu, two equivalent Ga, and four equivalent Al atoms to form AlEu6Al4Ga2 cuboctahedra that share corners with four equivalent GaEu6Al6 cuboctahedra, corners with fourteen equivalent AlEu6Al4Ga2 cuboctahedra, edges with six equivalent AlEu6Al4Ga2 cuboctahedra, faces with six equivalent GaEu6Al6 cuboctahedra, and faces with twelve equivalent AlEu6Al4Ga2 cuboctahedra. All Al–Al bond lengths are 2.83 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on EuAlGa by Materials Project

EuGaAl crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Eu is bonded in a 12-coordinate geometry to six equivalent Ga and six equivalent Al atoms. There are a spread of Eu–Ga bond distances ranging from 3.17–3.42 Å. There are a spread of Eu–Al bond distances ranging from 3.19–3.42 Å. Ga is bonded in a 10-coordinate geometry to six equivalent Eu, one Ga, and three equivalent Al atoms. The Ga–Ga bond length is 2.67 Å. There are two shorter (2.68 Å) and one longer (2.99 Å) Ga–Al bond lengths. Al is bonded in a 10-coordinate geometry to six equivalent Eu, three equivalent Ga, and one Al atom. The Al–Al bond length is 2.68 Å.

36 MATERIALS SCIENCE↗