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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ba(AlGe)2 by Materials Project

BaAl2Ge2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ba is bonded in a body-centered cubic geometry to eight equivalent Ge atoms. All Ba–Ge bond lengths are 3.51 Å. Al is bonded to four equivalent Ge atoms to form a mixture of corner and edge-sharing AlGe4 tetrahedra. All Al–Ge bond lengths are 2.62 Å. Ge is bonded in a 8-coordinate geometry to four equivalent Ba and four equivalent Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba(AlGe)2 by Materials Project

BaAl2Ge2 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. Ba is bonded in a 3-coordinate geometry to nine Al and seven Ge atoms. There are a spread of Ba–Al bond distances ranging from 3.44–3.90 Å. There are a spread of Ba–Ge bond distances ranging from 3.34–3.67 Å. There are two inequivalent Al sites. In the first Al site, Al is bonded to five equivalent Ba and four Ge atoms to form a mixture of distorted corner, edge, and face-sharing AlBa5Ge4 tetrahedra. There are a spread of Al–Ge bond distances ranging from 2.56–2.62 Å. In the second Al site, Al is bonded to four equivalent Ba and four Ge atoms to form distorted AlBa4Ge4 tetrahedra that share corners with fourteen AlBa5Ge4 tetrahedra, edges with two equivalent AlBa4Ge4 tetrahedra, and faces with eight AlBa5Ge4 tetrahedra. There are three shorter (2.60 Å) and one longer (2.61 Å) Al–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 7-coordinate geometry to three equivalent Ba and four Al atoms. In the second Ge site, Ge is bonded in a 4-coordinate geometry to four equivalent Ba and four Al atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ba3(AlGe)2 by Materials Project

Ba3Al2Ge2 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. there are two inequivalent Ba sites. In the first Ba site, Ba is bonded in a 7-coordinate geometry to two equivalent Al and five equivalent Ge atoms. Both Ba–Al bond lengths are 3.53 Å. There are four shorter (3.52 Å) and one longer (3.67 Å) Ba–Ge bond lengths. In the second Ba site, Ba is bonded to eight equivalent Al and four equivalent Ge atoms to form a mixture of edge and face-sharing BaAl8Ge4 cuboctahedra. All Ba–Al bond lengths are 3.62 Å. All Ba–Ge bond lengths are 3.76 Å. Al is bonded in a 2-coordinate geometry to six Ba, one Al, and two equivalent Ge atoms. The Al–Al bond length is 2.61 Å. Both Al–Ge bond lengths are 2.61 Å. Ge is bonded in a 2-coordinate geometry to seven Ba and two equivalent Al atoms.

36 MATERIALS SCIENCE↗