KTa(GeO3)3 crystallizes in the hexagonal P-6c2 space group. K(1) is bonded in a 6-coordinate geometry to six equivalent O(2) atoms. Ta(1) is bonded to six equivalent O(2) atoms to form TaO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra. Ge(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form GeO4 tetrahedra that share corners with two equivalent Ta(1)O6 octahedra and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 42°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Ge(1) atoms. In the second O site, O(2) is bonded in a 2-coordinate geometry to one K(1), one Ta(1), and one Ge(1) atom.
KTa(GeO3)3 crystallizes in the hexagonal P-6c2 space group. K(1) is bonded in a 6-coordinate geometry to six equivalent O(2) atoms. All K(1)-O(2) bond lengths are 2.97 Å. Ta(1) is bonded to six equivalent O(2) atoms to form TaO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra. All Ta(1)-O(2) bond lengths are 1.99 Å. Ge(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form GeO4 tetrahedra that share corners with two equivalent Ta(1)O6 octahedra and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 42°. Both Ge(1)-O(1) bond lengths are 1.78 Å. Both Ge(1)-O(2) bond lengths are 1.75 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Ge(1) atoms. In the second O site, O(2) is bonded in a 2-coordinate geometry to one K(1), one Ta(1), and one Ge(1) atom.