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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on LaMnCuGe2 by Materials Project

LaMnCuGe2 crystallizes in the tetragonal I-4m2 space group. The structure is three-dimensional. La is bonded in a 8-coordinate geometry to four equivalent Mn, four equivalent Cu, and eight equivalent Ge atoms. All La–Mn bond lengths are 3.39 Å. All La–Cu bond lengths are 3.39 Å. All La–Ge bond lengths are 3.26 Å. Mn is bonded to four equivalent La, four equivalent Cu, and four equivalent Ge atoms to form distorted MnLa4Cu4Ge4 tetrahedra that share corners with four equivalent CuLa4Mn4Ge4 cuboctahedra, corners with twelve equivalent MnLa4Cu4Ge4 tetrahedra, edges with two equivalent CuLa4Mn4Ge4 cuboctahedra, faces with four equivalent CuLa4Mn4Ge4 cuboctahedra, and faces with four equivalent MnLa4Cu4Ge4 tetrahedra. All Mn–Cu bond lengths are 2.98 Å. All Mn–Ge bond lengths are 2.50 Å. Cu is bonded to four equivalent La, four equivalent Mn, and four equivalent Ge atoms to form distorted CuLa4Mn4Ge4 cuboctahedra that share corners with twelve equivalent CuLa4Mn4Ge4 cuboctahedra, corners with four equivalent MnLa4Cu4Ge4 tetrahedra, edges with two equivalent MnLa4Cu4Ge4 tetrahedra, faces with four equivalent CuLa4Mn4Ge4 cuboctahedra, and faces with four equivalent MnLa4Cu4Ge4 tetrahedra. All Cu–Ge bond lengths are 2.50 Å. Ge is bonded in a 9-coordinate geometry to four equivalent La, two equivalent Mn, two equivalent Cu, and one Ge atom. The Ge–Ge bond length is 2.61 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on La2Mn3CuGe4 by Materials Project

La2Mn3CuGe4 crystallizes in the tetragonal P-4m2 space group. The structure is three-dimensional. La is bonded in a 8-coordinate geometry to six Mn, two equivalent Cu, and eight Ge atoms. There are two shorter (3.40 Å) and four longer (3.41 Å) La–Mn bond lengths. Both La–Cu bond lengths are 3.40 Å. There are four shorter (3.21 Å) and four longer (3.24 Å) La–Ge bond lengths. There are three inequivalent Mn sites. In the first Mn site, Mn is bonded to four equivalent La and four equivalent Ge atoms to form MnLa4Ge4 tetrahedra that share corners with eight equivalent CuLa4Mn4Ge4 cuboctahedra, corners with four equivalent MnLa4Cu4Ge4 tetrahedra, edges with six MnLa4Ge4 tetrahedra, and faces with four equivalent MnLa4Ge4 tetrahedra. All Mn–Ge bond lengths are 2.47 Å. In the second Mn site, Mn is bonded to four equivalent La, four equivalent Cu, and four equivalent Ge atoms to form distorted MnLa4Cu4Ge4 tetrahedra that share corners with sixteen MnLa4Ge4 tetrahedra, edges with two equivalent MnLa4Ge4 tetrahedra, faces with four equivalent CuLa4Mn4Ge4 cuboctahedra, and faces with four equivalent MnLa4Cu4Ge4 tetrahedra. All Mn–Cu bond lengths are 2.93 Å. All Mn–Ge bond lengths are 2.49 Å. In the third Mn site, Mn is bonded to four equivalent La and four equivalent Ge atoms to form MnLa4Ge4 tetrahedra that share corners with four equivalent CuLa4Mn4Ge4 cuboctahedra, corners with eight equivalent MnLa4Cu4Ge4 tetrahedra, edges with two equivalent CuLa4Mn4Ge4 cuboctahedra, edges with four equivalent MnLa4Ge4 tetrahedra, and faces with four equivalent MnLa4Ge4 tetrahedra. All Mn–Ge bond lengths are 2.47 Å. Cu is bonded to four equivalent La, four equivalent Mn, and four equivalent Ge atoms to form distorted CuLa4Mn4Ge4 cuboctahedra that share corners with four equivalent CuLa4Mn4Ge4 cuboctahedra, corners with twelve MnLa4Ge4 tetrahedra, edges with two equivalent MnLa4Ge4 tetrahedra, faces with four equivalent CuLa4Mn4Ge4 cuboctahedra, and faces with four equivalent MnLa4Cu4Ge4 tetrahedra. All Cu–Ge bond lengths are 2.49 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent La, two equivalent Mn, two equivalent Cu, and one Ge atom. The Ge–Ge bond length is 2.68 Å. In the second Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent La, four Mn, and one Ge atom.

36 MATERIALS SCIENCE↗