Na2Sr(P2O9)2 crystallizes in the orthorhombic Imm2 space group. Na(1) is bonded in a 5-coordinate geometry to one O(6), one O(7), two equivalent O(1), and two equivalent O(2) atoms. Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(5), two equivalent O(6), and four equivalent O(2) atoms. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing PO4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Na(1) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Sr(1), and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to two equivalent P(1) atoms. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent P(1) atoms. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), one O(5), and two equivalent O(7) atoms. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Na(1) and one Sr(1) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Na(1) and two equivalent O(5) atoms.
Na2Sr(P2O9)2 crystallizes in the orthorhombic Imm2 space group. Na(1) is bonded in a 5-coordinate geometry to one O(6), one O(7), two equivalent O(1), and two equivalent O(2) atoms. The Na(1)-O(6) bond length is 3.03 Å. The Na(1)-O(7) bond length is 2.71 Å. Both Na(1)-O(1) bond lengths are 2.35 Å. Both Na(1)-O(2) bond lengths are 2.40 Å. Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(5), two equivalent O(6), and four equivalent O(2) atoms. Both Sr(1)-O(5) bond lengths are 3.18 Å. Both Sr(1)-O(6) bond lengths are 2.76 Å. All Sr(1)-O(2) bond lengths are 2.51 Å. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing PO4 tetrahedra. The P(1)-O(1) bond length is 1.50 Å. The P(1)-O(2) bond length is 1.50 Å. The P(1)-O(3) bond length is 1.62 Å. The P(1)-O(4) bond length is 1.61 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Na(1) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Sr(1), and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to two equivalent P(1) atoms. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent P(1) atoms. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), one O(5), and two equivalent O(7) atoms. The O(5)-O(5) bond length is 1.47 Å. Both O(5)-O(7) bond lengths are 1.69 Å. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Na(1) and one Sr(1) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Na(1) and two equivalent O(5) atoms.