CaY2Ge4O12 crystallizes in the orthorhombic Cmme space group. Ca(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form CaO6 octahedra that share corners with eight equivalent Ge(1)O4 tetrahedra. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to two equivalent O(4) and four equivalent O(2) atoms to form YO6 octahedra that share corners with eight equivalent Ge(1)O4 tetrahedra. In the second Y site, Y(2) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GeO4 tetrahedra that share corners with two equivalent Ca(1)O6 octahedra, corners with two equivalent Y(1)O6 octahedra, and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-70°. There are four inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Ca(1) and two equivalent Ge(1) atoms. In the second O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Y(1) and two equivalent Ge(1) atoms. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to one Ca(1), one Y(2), and one Ge(1) atom. In the fourth O site, O(2) is bonded in a distorted trigonal planar geometry to one Y(1), one Y(2), and one Ge(1) atom.
CaY2Ge4O12 crystallizes in the orthorhombic Cmme space group. Ca(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form CaO6 octahedra that share corners with eight equivalent Ge(1)O4 tetrahedra. Both Ca(1)-O(3) bond lengths are 2.56 Å. All Ca(1)-O(1) bond lengths are 2.30 Å. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to two equivalent O(4) and four equivalent O(2) atoms to form YO6 octahedra that share corners with eight equivalent Ge(1)O4 tetrahedra. Both Y(1)-O(4) bond lengths are 2.48 Å. All Y(1)-O(2) bond lengths are 2.22 Å. In the second Y site, Y(2) is bonded in a 8-coordinate geometry to four equivalent O(1) and four equivalent O(2) atoms. All Y(2)-O(1) bond lengths are 2.36 Å. All Y(2)-O(2) bond lengths are 2.43 Å. Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GeO4 tetrahedra that share corners with two equivalent Ca(1)O6 octahedra, corners with two equivalent Y(1)O6 octahedra, and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-70°. The Ge(1)-O(1) bond length is 1.73 Å. The Ge(1)-O(2) bond length is 1.75 Å. The Ge(1)-O(3) bond length is 1.82 Å. The Ge(1)-O(4) bond length is 1.85 Å. There are four inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Ca(1) and two equivalent Ge(1) atoms. In the second O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Y(1) and two equivalent Ge(1) atoms. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to one Ca(1), one Y(2), and one Ge(1) atom. In the fourth O site, O(2) is bonded in a distorted trigonal planar geometry to one Y(1), one Y(2), and one Ge(1) atom.