BaCu2Ge2O7 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(3), and four equivalent O(2) atoms. Cu(1) is bonded in a rectangular see-saw-like geometry to one O(2), one O(3), and two equivalent O(4) atoms. Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing GeO4 tetrahedra. There are four inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal planar geometry to one Ba(1), one Cu(1), and one Ge(1) atom. In the second O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Cu(1) and one Ge(1) atom. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to one Ba(1) and two equivalent Ge(1) atoms. In the fourth O site, O(2) is bonded to two equivalent Ba(1), one Cu(1), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OBa2CuGe tetrahedra.
BaCu2Ge2O7 crystallizes in the orthorhombic Pnma space group. Ba(1) is bonded in a 7-coordinate geometry to one O(1), two equivalent O(3), and four equivalent O(2) atoms. The Ba(1)-O(1) bond length is 2.72 Å. Both Ba(1)-O(3) bond lengths are 2.77 Å. There are two shorter (2.92 Å) and two longer (2.93 Å) Ba(1)-O(2) bond lengths. Cu(1) is bonded in a rectangular see-saw-like geometry to one O(2), one O(3), and two equivalent O(4) atoms. The Cu(1)-O(2) bond length is 1.92 Å. The Cu(1)-O(3) bond length is 1.91 Å. Both Cu(1)-O(4) bond lengths are 1.99 Å. Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing GeO4 tetrahedra. The Ge(1)-O(1) bond length is 1.82 Å. The Ge(1)-O(2) bond length is 1.78 Å. The Ge(1)-O(3) bond length is 1.76 Å. The Ge(1)-O(4) bond length is 1.81 Å. There are four inequivalent O sites. In the first O site, O(3) is bonded in a distorted trigonal planar geometry to one Ba(1), one Cu(1), and one Ge(1) atom. In the second O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Cu(1) and one Ge(1) atom. In the third O site, O(1) is bonded in a distorted trigonal planar geometry to one Ba(1) and two equivalent Ge(1) atoms. In the fourth O site, O(2) is bonded to two equivalent Ba(1), one Cu(1), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OBa2CuGe tetrahedra.