Ba3GeO5 crystallizes in the tetragonal P4/ncc space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to two equivalent O(1) and eight equivalent O(2) atoms. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to two equivalent O(1) and six equivalent O(2) atoms. Ge(1) is bonded in a tetrahedral geometry to four equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1) and four equivalent Ba(2) atoms to form distorted corner-sharing OBa6 octahedra. The corner-sharing octahedral tilt angles range from 0-30°. In the second O site, O(2) is bonded in a 1-coordinate geometry to two equivalent Ba(1), three equivalent Ba(2), and one Ge(1) atom.
Ba3GeO5 crystallizes in the tetragonal P4/ncc space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 10-coordinate geometry to two equivalent O(1) and eight equivalent O(2) atoms. There is one shorter (2.68 Å) and one longer (3.17 Å) Ba(1)-O(1) bond length. There are four shorter (2.93 Å) and four longer (3.23 Å) Ba(1)-O(2) bond lengths. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to two equivalent O(1) and six equivalent O(2) atoms. Both Ba(2)-O(1) bond lengths are 2.71 Å. There are a spread of Ba(2)-O(2) bond distances ranging from 2.67-3.11 Å. Ge(1) is bonded in a tetrahedral geometry to four equivalent O(2) atoms. All Ge(1)-O(2) bond lengths are 1.77 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ba(1) and four equivalent Ba(2) atoms to form distorted corner-sharing OBa6 octahedra. The corner-sharing octahedral tilt angles range from 0-30°. In the second O site, O(2) is bonded in a 1-coordinate geometry to two equivalent Ba(1), three equivalent Ba(2), and one Ge(1) atom.