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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Eu(AlGe)2 by Materials Project

EuAl2Ge2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Eu is bonded to six equivalent Ge atoms to form EuGe6 octahedra that share corners with twelve equivalent AlGe4 tetrahedra, edges with six equivalent EuGe6 octahedra, and edges with six equivalent AlGe4 tetrahedra. All Eu–Ge bond lengths are 3.10 Å. Al is bonded to four equivalent Ge atoms to form AlGe4 tetrahedra that share corners with six equivalent EuGe6 octahedra, corners with six equivalent AlGe4 tetrahedra, edges with three equivalent EuGe6 octahedra, and edges with three equivalent AlGe4 tetrahedra. The corner-sharing octahedra tilt angles range from 20–52°. There are three shorter (2.57 Å) and one longer (2.63 Å) Al–Ge bond lengths. Ge is bonded to three equivalent Eu and four equivalent Al atoms to form a mixture of distorted corner and edge-sharing GeEu3Al4 pentagonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on EuAl2Ge by Materials Project

EuAl2Ge crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Eu is bonded in a 5-coordinate geometry to four equivalent Al and three equivalent Ge atoms. There are two shorter (3.20 Å) and two longer (3.37 Å) Eu–Al bond lengths. There are two shorter (3.13 Å) and one longer (3.17 Å) Eu–Ge bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a 2-coordinate geometry to three equivalent Al and two equivalent Ge atoms. There are one shorter (2.62 Å) and two longer (2.72 Å) Al–Al bond lengths. Both Al–Ge bond lengths are 2.64 Å. In the second Al site, Al is bonded in a 2-coordinate geometry to four equivalent Eu, three equivalent Al, and two equivalent Ge atoms. There are one shorter (2.50 Å) and one longer (2.60 Å) Al–Ge bond lengths. Ge is bonded in a 7-coordinate geometry to three equivalent Eu and four Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on EuAlGe by Materials Project

EuAlGe crystallizes in the tetragonal I4_1md space group. The structure is three-dimensional. Eu is bonded to six equivalent Al and six Ge atoms to form a mixture of edge and face-sharing EuAl6Ge6 cuboctahedra. There are two shorter (3.31 Å) and four longer (3.32 Å) Eu–Al bond lengths. There are two shorter (3.31 Å) and four longer (3.32 Å) Eu–Ge bond lengths. There are two inequivalent Al sites. In the first Al site, Al is bonded in a distorted trigonal planar geometry to six equivalent Eu and three Ge atoms. There are one shorter (2.48 Å) and two longer (2.51 Å) Al–Ge bond lengths. In the second Al site, Al is bonded in a distorted trigonal planar geometry to six equivalent Eu and three Ge atoms. There are two shorter (3.31 Å) and four longer (3.32 Å) Al–Eu bond lengths. There are one shorter (2.48 Å) and two longer (2.51 Å) Al–Ge bond lengths. There are four inequivalent Ge sites. In the first Ge site, Ge is bonded in a distorted trigonal planar geometry to six equivalent Eu and three Al atoms. There are two shorter (3.31 Å) and four longer (3.32 Å) Ge–Eu bond lengths. The Ge–Al bond length is 2.48 Å. In the second Ge site, Ge is bonded in a distorted trigonal planar geometry to six equivalent Eu and three Al atoms. In the third Ge site, Ge is bonded in a distorted trigonal planar geometry to six equivalent Eu and three equivalent Al atoms. In the fourth Ge site, Ge is bonded in a distorted trigonal planar geometry to six equivalent Eu and three equivalent Al atoms. There are two shorter (3.31 Å) and four longer (3.32 Å) Ge–Eu bond lengths. There are one shorter (2.48 Å) and two longer (2.51 Å) Ge–Al bond lengths.

36 MATERIALS SCIENCE↗