SrCaSn(PO4)2 crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 1-coordinate geometry to one O(2), one O(3), one O(6), and two equivalent O(1) atoms. Ca(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(7) atom. Sn(1) is bonded in a 3-coordinate geometry to one O(4), one O(7), and one O(8) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(2), one O(3), and one O(7) atom. In the second P site, P(2) is bonded in a 4-coordinate geometry to one O(4), one O(5), one O(6), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Ca(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Ca(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one P(1), and one O(7) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Ca(1), one Sn(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Ca(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Sr(1), one Ca(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ca(1), one Sn(1), one P(1), and one O(3) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(2) atom.
SrCaSn(PO4)2 crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 1-coordinate geometry to one O(2), one O(3), one O(6), and two equivalent O(1) atoms. The Sr(1)-O(2) bond length is 2.40 Å. The Sr(1)-O(3) bond length is 1.76 Å. The Sr(1)-O(6) bond length is 2.79 Å. There is one shorter (2.48 Å) and one longer (3.18 Å) Sr(1)-O(1) bond length. Ca(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(7) atom. The Ca(1)-O(1) bond length is 2.82 Å. The Ca(1)-O(2) bond length is 2.60 Å. The Ca(1)-O(4) bond length is 2.59 Å. The Ca(1)-O(5) bond length is 2.82 Å. The Ca(1)-O(6) bond length is 2.65 Å. The Ca(1)-O(7) bond length is 2.43 Å. Sn(1) is bonded in a 3-coordinate geometry to one O(4), one O(7), and one O(8) atom. The Sn(1)-O(4) bond length is 2.06 Å. The Sn(1)-O(7) bond length is 2.44 Å. The Sn(1)-O(8) bond length is 1.93 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(2), one O(3), and one O(7) atom. The P(1)-O(1) bond length is 1.94 Å. The P(1)-O(2) bond length is 1.63 Å. The P(1)-O(3) bond length is 1.47 Å. The P(1)-O(7) bond length is 1.73 Å. In the second P site, P(2) is bonded in a 4-coordinate geometry to one O(4), one O(5), one O(6), and one O(8) atom. The P(2)-O(4) bond length is 1.71 Å. The P(2)-O(5) bond length is 1.16 Å. The P(2)-O(6) bond length is 2.11 Å. The P(2)-O(8) bond length is 1.67 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Ca(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Ca(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one P(1), and one O(7) atom. The O(3)-O(7) bond length is 1.76 Å. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Ca(1), one Sn(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Ca(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Sr(1), one Ca(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Ca(1), one Sn(1), one P(1), and one O(3) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(2) atom.