Sr2MgZn2Sn2(PO4)4 crystallizes in the triclinic P1 space group. There are two 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(11), one O(14), one O(15), one O(5), and one O(8) atom. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(16), one O(2), one O(4), one O(8), and one O(9) atom. Mg(1) is bonded to one O(1), one O(11), one O(16), one O(4), and one O(5) atom to form distorted MgO5 square pyramids that share  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and  an edgeedge with one P(4)O4 tetrahedra. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 3-coordinate geometry to one O(13), one O(2), and one O(7) atom. In the second Zn site, Zn(2) is bonded in a 3-coordinate geometry to one O(12), one O(15), and one O(6) atom. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 3-coordinate geometry to one O(12), one O(3), and one O(6) atom. In the second Sn site, Sn(2) is bonded to one O(13), one O(14), one O(7), and one O(9) atom to form distorted SnO4 trigonal pyramids that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, and  an edgeedge with one P(3)O4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(11), one O(12), one O(2), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Mg(1)O5 square pyramid and  a cornercorner with one Sn(2)O4 trigonal pyramid. In the second P site, P(2) is bonded to one O(1), one O(13), one O(3), and one O(5) atom to form PO4 tetrahedra that share corners with two equivalent Mg(1)O5 square pyramids and  a cornercorner with one Sn(2)O4 trigonal pyramid. In the third P site, P(3) is bonded to one O(10), one O(14), one O(15), and one O(7) atom to form PO4 tetrahedra that share  an edgeedge with one Sn(2)O4 trigonal pyramid. In the fourth P site, P(4) is bonded to one O(16), one O(4), one O(6), and one O(8) atom to form PO4 tetrahedra that share  an edgeedge with one Mg(1)O5 square pyramid. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sr(1), one Mg(1), and one P(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Sr(2), one Zn(1), and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(2), one Mg(1), and one P(4) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Sr(1), one Mg(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Zn(2), one Sn(1), and one P(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Zn(1), one Sn(2), and one P(3) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one P(4) atom. In the ninth O site, O(9) is bonded in a 2-coordinate geometry to one Sr(2), one Sn(2), and one P(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one P(3) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(2), one Mg(1), and one P(1) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Zn(2), one Sn(1), and one P(1) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Zn(1), one Sn(2), and one P(2) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Sr(1), one Sn(2), and one P(3) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Sr(1), one Zn(2), and one P(3) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Sr(2), one Mg(1), and one P(4) atom.
Sr2MgZn2Sn2(PO4)4 crystallizes in the triclinic P1 space group. There are two 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(11), one O(14), one O(15), one O(5), and one O(8) atom. The Sr(1)-O(1) bond length is 2.61 Å. The Sr(1)-O(10) bond length is 2.52 Å. The Sr(1)-O(11) bond length is 2.82 Å. The Sr(1)-O(14) bond length is 2.46 Å. The Sr(1)-O(15) bond length is 2.74 Å. The Sr(1)-O(5) bond length is 2.94 Å. The Sr(1)-O(8) bond length is 2.43 Å. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(16), one O(2), one O(4), one O(8), and one O(9) atom. The Sr(2)-O(10) bond length is 2.41 Å. The Sr(2)-O(11) bond length is 2.84 Å. The Sr(2)-O(16) bond length is 2.50 Å. The Sr(2)-O(2) bond length is 2.51 Å. The Sr(2)-O(4) bond length is 2.58 Å. The Sr(2)-O(8) bond length is 2.70 Å. The Sr(2)-O(9) bond length is 3.10 Å. Mg(1) is bonded to one O(1), one O(11), one O(16), one O(4), and one O(5) atom to form distorted MgO5 square pyramids that share  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and  an edgeedge with one P(4)O4 tetrahedra. The Mg(1)-O(1) bond length is 2.08 Å. The Mg(1)-O(11) bond length is 2.06 Å. The Mg(1)-O(16) bond length is 2.20 Å. The Mg(1)-O(4) bond length is 2.03 Å. The Mg(1)-O(5) bond length is 1.99 Å. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 3-coordinate geometry to one O(13), one O(2), and one O(7) atom. The Zn(1)-O(13) bond length is 2.17 Å. The Zn(1)-O(2) bond length is 2.15 Å. The Zn(1)-O(7) bond length is 2.14 Å. In the second Zn site, Zn(2) is bonded in a 3-coordinate geometry to one O(12), one O(15), and one O(6) atom. The Zn(2)-O(12) bond length is 2.12 Å. The Zn(2)-O(15) bond length is 2.06 Å. The Zn(2)-O(6) bond length is 2.07 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 3-coordinate geometry to one O(12), one O(3), and one O(6) atom. The Sn(1)-O(12) bond length is 2.32 Å. The Sn(1)-O(3) bond length is 2.14 Å. The Sn(1)-O(6) bond length is 2.25 Å. In the second Sn site, Sn(2) is bonded to one O(13), one O(14), one O(7), and one O(9) atom to form distorted SnO4 trigonal pyramids that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, and  an edgeedge with one P(3)O4 tetrahedra. The Sn(2)-O(13) bond length is 2.25 Å. The Sn(2)-O(14) bond length is 2.49 Å. The Sn(2)-O(7) bond length is 2.25 Å. The Sn(2)-O(9) bond length is 2.24 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(11), one O(12), one O(2), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Mg(1)O5 square pyramid and  a cornercorner with one Sn(2)O4 trigonal pyramid. The P(1)-O(11) bond length is 1.55 Å. The P(1)-O(12) bond length is 1.58 Å. The P(1)-O(2) bond length is 1.54 Å. The P(1)-O(9) bond length is 1.57 Å. In the second P site, P(2) is bonded to one O(1), one O(13), one O(3), and one O(5) atom to form PO4 tetrahedra that share corners with two equivalent Mg(1)O5 square pyramids and  a cornercorner with one Sn(2)O4 trigonal pyramid. The P(2)-O(1) bond length is 1.55 Å. The P(2)-O(13) bond length is 1.58 Å. The P(2)-O(3) bond length is 1.55 Å. The P(2)-O(5) bond length is 1.55 Å. In the third P site, P(3) is bonded to one O(10), one O(14), one O(15), and one O(7) atom to form PO4 tetrahedra that share  an edgeedge with one Sn(2)O4 trigonal pyramid. The P(3)-O(10) bond length is 1.53 Å. The P(3)-O(14) bond length is 1.55 Å. The P(3)-O(15) bond length is 1.55 Å. The P(3)-O(7) bond length is 1.60 Å. In the fourth P site, P(4) is bonded to one O(16), one O(4), one O(6), and one O(8) atom to form PO4 tetrahedra that share  an edgeedge with one Mg(1)O5 square pyramid. The P(4)-O(16) bond length is 1.56 Å. The P(4)-O(4) bond length is 1.56 Å. The P(4)-O(6) bond length is 1.57 Å. The P(4)-O(8) bond length is 1.53 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Sr(1), one Mg(1), and one P(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Sr(2), one Zn(1), and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(2), one Mg(1), and one P(4) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Sr(1), one Mg(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Zn(2), one Sn(1), and one P(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Zn(1), one Sn(2), and one P(3) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one P(4) atom. In the ninth O site, O(9) is bonded in a 2-coordinate geometry to one Sr(2), one Sn(2), and one P(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one P(3) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(2), one Mg(1), and one P(1) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Zn(2), one Sn(1), and one P(1) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Zn(1), one Sn(2), and one P(2) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Sr(1), one Sn(2), and one P(3) atom. In the fifteenth O site, O(15) is bonded in a 3-coordinate geometry to one Sr(1), one Zn(2), and one P(3) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Sr(2), one Mg(1), and one P(4) atom.