Sr2GeO4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Ge(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Sr(2), and one Ge(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and one Ge(1) atom. In the third O site, O(3) is bonded to two equivalent Sr(1), two equivalent Sr(2), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OSr4Ge trigonal bipyramids. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Sr(2), and one Ge(1) atom.
Sr2GeO4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one O(1), one O(4), two equivalent O(2), and two equivalent O(3) atoms. The Sr(1)-O(1) bond length is 2.38 Å. The Sr(1)-O(4) bond length is 2.66 Å. There is one shorter (2.54 Å) and one longer (2.79 Å) Sr(1)-O(2) bond length. There is one shorter (2.59 Å) and one longer (2.73 Å) Sr(1)-O(3) bond length. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. There is one shorter (2.59 Å) and one longer (2.79 Å) Sr(2)-O(1) bond length. There is one shorter (2.62 Å) and one longer (2.79 Å) Sr(2)-O(2) bond length. There is one shorter (2.53 Å) and one longer (2.78 Å) Sr(2)-O(3) bond length. There is one shorter (2.54 Å) and one longer (2.55 Å) Sr(2)-O(4) bond length. Ge(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Ge(1)-O(1) bond length is 1.74 Å. The Ge(1)-O(2) bond length is 1.78 Å. The Ge(1)-O(3) bond length is 1.77 Å. The Ge(1)-O(4) bond length is 1.76 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Sr(2), and one Ge(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and one Ge(1) atom. In the third O site, O(3) is bonded to two equivalent Sr(1), two equivalent Sr(2), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OSr4Ge trigonal bipyramids. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Sr(2), and one Ge(1) atom.