Sr3P4O13 crystallizes in the triclinic P-1 space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(3), one O(6), one O(7), and two equivalent O(9) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(12), one O(13), one O(4), one O(6), and two equivalent O(8) atoms. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(10), one O(12), one O(13), one O(3), one O(7), one O(8), one O(9), and two equivalent O(4) atoms. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(5), and one O(6) atom to form corner-sharing PO4 tetrahedra. In the second P site, P(2) is bonded to one O(10), one O(11), one O(4), and one O(8) atom to form corner-sharing PO4 tetrahedra. In the third P site, P(3) is bonded to one O(12), one O(5), one O(7), and one O(9) atom to form corner-sharing PO4 tetrahedra. In the fourth P site, P(4) is bonded to one O(1), one O(11), one O(13), and one O(2) atom to form corner-sharing PO4 tetrahedra. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one P(4) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one P(1) and one P(4) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(3), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(3), and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one P(1) and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), and one P(1) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), and one P(3) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Sr(3), two equivalent Sr(2), and one P(2) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Sr(3), two equivalent Sr(1), and one P(3) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), one Sr(3), and one P(2) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one P(2) and one P(4) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), and one P(3) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), and one P(4) atom.
Sr3P4O13 crystallizes in the triclinic P-1 space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(3), one O(6), one O(7), and two equivalent O(9) atoms. The Sr(1)-O(1) bond length is 2.67 Å. The Sr(1)-O(10) bond length is 2.54 Å. The Sr(1)-O(3) bond length is 2.76 Å. The Sr(1)-O(6) bond length is 2.54 Å. The Sr(1)-O(7) bond length is 2.49 Å. There is one shorter (2.65 Å) and one longer (2.72 Å) Sr(1)-O(9) bond length. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(12), one O(13), one O(4), one O(6), and two equivalent O(8) atoms. The Sr(2)-O(1) bond length is 2.54 Å. The Sr(2)-O(10) bond length is 3.02 Å. The Sr(2)-O(12) bond length is 2.52 Å. The Sr(2)-O(13) bond length is 2.58 Å. The Sr(2)-O(4) bond length is 2.60 Å. The Sr(2)-O(6) bond length is 2.62 Å. There is one shorter (2.66 Å) and one longer (2.70 Å) Sr(2)-O(8) bond length. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one O(10), one O(12), one O(13), one O(3), one O(7), one O(8), one O(9), and two equivalent O(4) atoms. The Sr(3)-O(10) bond length is 2.61 Å. The Sr(3)-O(12) bond length is 2.57 Å. The Sr(3)-O(13) bond length is 2.55 Å. The Sr(3)-O(3) bond length is 2.52 Å. The Sr(3)-O(7) bond length is 2.77 Å. The Sr(3)-O(8) bond length is 2.54 Å. The Sr(3)-O(9) bond length is 2.63 Å. There is one shorter (3.01 Å) and one longer (3.16 Å) Sr(3)-O(4) bond length. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(5), and one O(6) atom to form corner-sharing PO4 tetrahedra. The P(1)-O(2) bond length is 1.59 Å. The P(1)-O(3) bond length is 1.49 Å. The P(1)-O(5) bond length is 1.58 Å. The P(1)-O(6) bond length is 1.49 Å. In the second P site, P(2) is bonded to one O(10), one O(11), one O(4), and one O(8) atom to form corner-sharing PO4 tetrahedra. The P(2)-O(10) bond length is 1.52 Å. The P(2)-O(11) bond length is 1.63 Å. The P(2)-O(4) bond length is 1.50 Å. The P(2)-O(8) bond length is 1.53 Å. In the third P site, P(3) is bonded to one O(12), one O(5), one O(7), and one O(9) atom to form corner-sharing PO4 tetrahedra. The P(3)-O(12) bond length is 1.51 Å. The P(3)-O(5) bond length is 1.63 Å. The P(3)-O(7) bond length is 1.51 Å. The P(3)-O(9) bond length is 1.53 Å. In the fourth P site, P(4) is bonded to one O(1), one O(11), one O(13), and one O(2) atom to form corner-sharing PO4 tetrahedra. The P(4)-O(1) bond length is 1.49 Å. The P(4)-O(11) bond length is 1.58 Å. The P(4)-O(13) bond length is 1.49 Å. The P(4)-O(2) bond length is 1.59 Å. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one P(4) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one P(1) and one P(4) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(3), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(3), and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one P(1) and one P(3) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Sr(1), one Sr(2), and one P(1) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), and one P(3) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Sr(3), two equivalent Sr(2), and one P(2) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Sr(3), two equivalent Sr(1), and one P(3) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), one Sr(3), and one P(2) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one P(2) and one P(4) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), and one P(3) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), and one P(4) atom.