Materials Data on Ca2Ge by Materials Project
Ca2Ge is Cotunnite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Ca sites. In the first Ca site, Ca is bonded to four equivalent Ge atoms to form a mixture of edge and corner-sharing CaGe4 tetrahedra. There are a spread of Ca–Ge bond distances ranging from 3.01–3.09 Å. In the second Ca site, Ca is bonded in a 3-coordinate geometry to five equivalent Ge atoms. There are a spread of Ca–Ge bond distances ranging from 3.13–3.59 Å. Ge is bonded in a 9-coordinate geometry to nine Ca atoms.
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