Rb2Sr(PO3)4 crystallizes in the tetragonal I-4 space group. Rb(1) is bonded in a 10-coordinate geometry to two equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms. Sr(1) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(3) atoms. P(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form corner-sharing PO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Rb(1) and two equivalent P(1) atoms. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Rb(1), one Sr(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Rb(1), one Sr(1), and one P(1) atom.
Rb2Sr(PO3)4 crystallizes in the tetragonal I-4 space group. Rb(1) is bonded in a 10-coordinate geometry to two equivalent O(1), four equivalent O(2), and four equivalent O(3) atoms. Both Rb(1)-O(1) bond lengths are 3.08 Å. There are two shorter (2.87 Å) and two longer (3.40 Å) Rb(1)-O(2) bond lengths. There are two shorter (2.95 Å) and two longer (3.03 Å) Rb(1)-O(3) bond lengths. Sr(1) is bonded in a 8-coordinate geometry to four equivalent O(2) and four equivalent O(3) atoms. All Sr(1)-O(2) bond lengths are 2.69 Å. All Sr(1)-O(3) bond lengths are 2.55 Å. P(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form corner-sharing PO4 tetrahedra. The P(1)-O(2) bond length is 1.48 Å. The P(1)-O(3) bond length is 1.49 Å. There is one shorter (1.61 Å) and one longer (1.62 Å) P(1)-O(1) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Rb(1) and two equivalent P(1) atoms. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Rb(1), one Sr(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Rb(1), one Sr(1), and one P(1) atom.