SrTiZn(PO4)2 crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(8), two equivalent O(1), and two equivalent O(6) atoms. Ti(1) is bonded to one O(3), one O(4), one O(5), one O(7), and two equivalent O(8) atoms to form TiO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with three equivalent Zn(1)O4 trigonal pyramids,  an edgeedge with one Ti(1)O6 octahedra, and  an edgeedge with one P(2)O4 tetrahedra. Zn(1) is bonded to one O(2), one O(4), one O(5), and one O(7) atom to form ZnO4 trigonal pyramids that share corners with three equivalent Ti(1)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 63-75°. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Ti(1)O6 octahedra and corners with two equivalent Zn(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 51-54°. In the second P site, P(2) is bonded to one O(4), one O(5), one O(6), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Zn(1)O4 trigonal pyramids, and  an edgeedge with one Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-56°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Sr(1) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Sr(1), one Zn(1), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), one Ti(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), one Ti(1), one Zn(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Ti(1), one Zn(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Sr(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Ti(1), one Zn(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Sr(1), two equivalent Ti(1), and one P(2) atom.
SrTiZn(PO4)2 crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(8), two equivalent O(1), and two equivalent O(6) atoms. The Sr(1)-O(2) bond length is 2.79 Å. The Sr(1)-O(3) bond length is 2.69 Å. The Sr(1)-O(4) bond length is 2.78 Å. The Sr(1)-O(8) bond length is 2.95 Å. There is one shorter (2.54 Å) and one longer (2.68 Å) Sr(1)-O(1) bond length. There is one shorter (2.54 Å) and one longer (2.76 Å) Sr(1)-O(6) bond length. Ti(1) is bonded to one O(3), one O(4), one O(5), one O(7), and two equivalent O(8) atoms to form TiO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with three equivalent Zn(1)O4 trigonal pyramids,  an edgeedge with one Ti(1)O6 octahedra, and  an edgeedge with one P(2)O4 tetrahedra. The Ti(1)-O(3) bond length is 2.14 Å. The Ti(1)-O(4) bond length is 2.20 Å. The Ti(1)-O(5) bond length is 2.26 Å. The Ti(1)-O(7) bond length is 2.14 Å. There is one shorter (2.16 Å) and one longer (2.17 Å) Ti(1)-O(8) bond length. Zn(1) is bonded to one O(2), one O(4), one O(5), and one O(7) atom to form ZnO4 trigonal pyramids that share corners with three equivalent Ti(1)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 63-75°. The Zn(1)-O(2) bond length is 1.96 Å. The Zn(1)-O(4) bond length is 2.07 Å. The Zn(1)-O(5) bond length is 2.02 Å. The Zn(1)-O(7) bond length is 2.00 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Ti(1)O6 octahedra and corners with two equivalent Zn(1)O4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 51-54°. The P(1)-O(1) bond length is 1.54 Å. The P(1)-O(2) bond length is 1.56 Å. The P(1)-O(3) bond length is 1.54 Å. The P(1)-O(7) bond length is 1.59 Å. In the second P site, P(2) is bonded to one O(4), one O(5), one O(6), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Ti(1)O6 octahedra, corners with two equivalent Zn(1)O4 trigonal pyramids, and  an edgeedge with one Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-56°. The P(2)-O(4) bond length is 1.58 Å. The P(2)-O(5) bond length is 1.58 Å. The P(2)-O(6) bond length is 1.51 Å. The P(2)-O(8) bond length is 1.56 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to two equivalent Sr(1) and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Sr(1), one Zn(1), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), one Ti(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), one Ti(1), one Zn(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Ti(1), one Zn(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Sr(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Ti(1), one Zn(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Sr(1), two equivalent Ti(1), and one P(2) atom.