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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on MgMnGe by Materials Project

MgMnGe is Matlockite structured and crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Mg is bonded in a 5-coordinate geometry to four equivalent Mn and five equivalent Ge atoms. All Mg–Mn bond lengths are 2.92 Å. There are one shorter (2.82 Å) and four longer (2.83 Å) Mg–Ge bond lengths. Mn is bonded to four equivalent Mg and four equivalent Ge atoms to form a mixture of distorted edge and face-sharing MnMg4Ge4 tetrahedra. All Mn–Ge bond lengths are 2.50 Å. Ge is bonded in a 9-coordinate geometry to five equivalent Mg and four equivalent Mn atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg(MnGe)6 by Materials Project

Mg(MnGe)6 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Mg is bonded to eight Ge atoms to form distorted edge-sharing MgGe8 hexagonal bipyramids. There are two shorter (2.68 Å) and six longer (2.98 Å) Mg–Ge bond lengths. Mn is bonded in a 12-coordinate geometry to six Ge atoms. There are a spread of Mn–Ge bond distances ranging from 2.50–2.67 Å. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded in a 8-coordinate geometry to one Mg, six equivalent Mn, and one Ge atom. The Ge–Ge bond length is 2.68 Å. In the second Ge site, Ge is bonded in a 6-coordinate geometry to six equivalent Mn atoms. In the third Ge site, Ge is bonded in a 9-coordinate geometry to three equivalent Mg and six equivalent Mn atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Mg2MnGe2 by Materials Project

(MgGe)2Mn crystallizes in the tetragonal P4/mmm space group. The structure is zero-dimensional and consists of one manganese molecule and two MgGe clusters. In each MgGe cluster, Mg is bonded in a single-bond geometry to one Ge atom. The Mg–Ge bond length is 2.58 Å. Ge is bonded in a single-bond geometry to one Mg atom.

36 MATERIALS SCIENCE↗