SrMgFe(PO4)2 crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(6) atom. Mg(1) is bonded in a 2-coordinate geometry to one O(2), one O(4), one O(6), one O(7), and one O(8) atom. Fe(1) is bonded in a distorted bent 150 degrees 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 4-coordinate 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 1-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 2-coordinate geometry to one Sr(1) and one P(1) atom. In the second O site, O(2) is bonded in a water-like geometry to one Mg(1) and one P(1) atom. In the third O site, O(3) is bonded in a water-like geometry to one Sr(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted water-like geometry to one Mg(1), one Fe(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Sr(1), one Mg(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Mg(1), one Fe(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Mg(1), one Fe(1), and one P(2) atom.
SrMgFe(PO4)2 crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(6) atom. The Sr(1)-O(1) bond length is 1.79 Å. The Sr(1)-O(3) bond length is 2.06 Å. The Sr(1)-O(6) bond length is 2.22 Å. Mg(1) is bonded in a 2-coordinate geometry to one O(2), one O(4), one O(6), one O(7), and one O(8) atom. The Mg(1)-O(2) bond length is 1.67 Å. The Mg(1)-O(4) bond length is 2.34 Å. The Mg(1)-O(6) bond length is 2.64 Å. The Mg(1)-O(7) bond length is 1.91 Å. The Mg(1)-O(8) bond length is 2.46 Å. Fe(1) is bonded in a distorted bent 150 degrees geometry to one O(4), one O(7), and one O(8) atom. The Fe(1)-O(4) bond length is 1.40 Å. The Fe(1)-O(7) bond length is 1.40 Å. The Fe(1)-O(8) bond length is 2.32 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(7) atom. The P(1)-O(1) bond length is 1.79 Å. The P(1)-O(2) bond length is 1.72 Å. The P(1)-O(3) bond length is 1.54 Å. The P(1)-O(7) bond length is 1.98 Å. In the second P site, P(2) is bonded in a 1-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 1.59 Å. The P(2)-O(5) bond length is 1.09 Å. The P(2)-O(6) bond length is 2.23 Å. The P(2)-O(8) bond length is 2.00 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Sr(1) and one P(1) atom. In the second O site, O(2) is bonded in a water-like geometry to one Mg(1) and one P(1) atom. In the third O site, O(3) is bonded in a water-like geometry to one Sr(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted water-like geometry to one Mg(1), one Fe(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Sr(1), one Mg(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Mg(1), one Fe(1), and one P(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Mg(1), one Fe(1), and one P(2) atom.