SrMn2(PO4)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to one O(1), one O(12), one O(14), one O(15), one O(16), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(13), one O(16), one O(2), one O(7), one O(8), and one O(9) atom. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(15), one O(2), one O(3), one O(4), one O(6), and one O(7) atom to form distorted MnO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra,  a cornercorner with one Mn(2)O5 trigonal bipyramid, corners with two equivalent Mn(4)O5 trigonal bipyramids, and  an edgeedge with one P(1)O4 tetrahedra. In the second Mn site, Mn(2) is bonded to one O(10), one O(12), one O(3), one O(5), and one O(8) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, and corners with two equivalent Mn(3)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 73°. In the third Mn site, Mn(3) is bonded to one O(11), one O(12), one O(14), one O(16), and one O(8) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, corners with two equivalent Mn(2)O5 trigonal bipyramids, and  an edgeedge with one Mn(4)O5 trigonal bipyramid. In the fourth Mn site, Mn(4) is bonded to one O(11), one O(13), one O(14), one O(2), and one O(4) atom to form distorted MnO5 trigonal bipyramids that share corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one P(3)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, and  an edgeedge with one Mn(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 72-73°. There are four 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(4) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O5 trigonal bipyramid, corners with two equivalent Mn(4)O5 trigonal bipyramids, and  an edgeedge with one Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles are 56°. In the second P site, P(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one Mn(3)O5 trigonal bipyramid, and corners with two equivalent Mn(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 42-66°. In the third P site, P(3) is bonded to one O(10), one O(11), one O(12), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(4)O5 trigonal bipyramid, corners with two equivalent Mn(2)O5 trigonal bipyramids, and corners with two equivalent Mn(3)O5 trigonal bipyramids. In the fourth P site, P(4) is bonded to one O(13), one O(14), one O(15), and one O(16) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra, corners with two equivalent Mn(3)O5 trigonal bipyramids, and corners with two equivalent Mn(4)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 68°. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Sr(1), one Sr(2), and one P(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(2), one Mn(1), one Mn(4), and one P(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Mn(1), one Mn(2), and one P(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), one Mn(1), one Mn(4), and one P(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Sr(1), one Mn(2), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one Mn(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Mn(1), and one P(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), one Mn(2), one Mn(3), and one P(2) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one P(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Sr(2), one Mn(2), and one P(3) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Mn(3), one Mn(4), and one P(3) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Sr(1), one Mn(2), one Mn(3), and one P(3) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 150 degrees geometry to one Sr(2), one Mn(4), and one P(4) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Sr(1), one Mn(3), one Mn(4), and one P(4) atom. In the fifteenth O site, O(15) is bonded in a 2-coordinate geometry to one Sr(1), one Mn(1), and one P(4) atom. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Mn(3), and one P(4) atom.
SrMn2(PO4)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to one O(1), one O(12), one O(14), one O(15), one O(16), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. The Sr(1)-O(1) bond length is 3.17 Å. The Sr(1)-O(12) bond length is 2.82 Å. The Sr(1)-O(14) bond length is 2.71 Å. The Sr(1)-O(15) bond length is 2.87 Å. The Sr(1)-O(16) bond length is 2.80 Å. The Sr(1)-O(4) bond length is 2.61 Å. The Sr(1)-O(5) bond length is 2.59 Å. The Sr(1)-O(6) bond length is 3.03 Å. The Sr(1)-O(7) bond length is 2.74 Å. The Sr(1)-O(9) bond length is 2.56 Å. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(13), one O(16), one O(2), one O(7), one O(8), and one O(9) atom. The Sr(2)-O(1) bond length is 2.39 Å. The Sr(2)-O(10) bond length is 2.76 Å. The Sr(2)-O(13) bond length is 2.90 Å. The Sr(2)-O(16) bond length is 2.71 Å. The Sr(2)-O(2) bond length is 2.81 Å. The Sr(2)-O(7) bond length is 2.66 Å. The Sr(2)-O(8) bond length is 2.78 Å. The Sr(2)-O(9) bond length is 2.47 Å. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(15), one O(2), one O(3), one O(4), one O(6), and one O(7) atom to form distorted MnO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra,  a cornercorner with one Mn(2)O5 trigonal bipyramid, corners with two equivalent Mn(4)O5 trigonal bipyramids, and  an edgeedge with one P(1)O4 tetrahedra. The Mn(1)-O(15) bond length is 2.25 Å. The Mn(1)-O(2) bond length is 2.34 Å. The Mn(1)-O(3) bond length is 2.15 Å. The Mn(1)-O(4) bond length is 2.45 Å. The Mn(1)-O(6) bond length is 2.16 Å. The Mn(1)-O(7) bond length is 2.17 Å. In the second Mn site, Mn(2) is bonded to one O(10), one O(12), one O(3), one O(5), and one O(8) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, and corners with two equivalent Mn(3)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 73°. The Mn(2)-O(10) bond length is 2.15 Å. The Mn(2)-O(12) bond length is 2.26 Å. The Mn(2)-O(3) bond length is 2.17 Å. The Mn(2)-O(5) bond length is 2.12 Å. The Mn(2)-O(8) bond length is 2.23 Å. In the third Mn site, Mn(3) is bonded to one O(11), one O(12), one O(14), one O(16), and one O(8) atom to form distorted MnO5 trigonal bipyramids that share  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, corners with two equivalent Mn(2)O5 trigonal bipyramids, and  an edgeedge with one Mn(4)O5 trigonal bipyramid. The Mn(3)-O(11) bond length is 2.17 Å. The Mn(3)-O(12) bond length is 2.18 Å. The Mn(3)-O(14) bond length is 2.16 Å. The Mn(3)-O(16) bond length is 2.15 Å. The Mn(3)-O(8) bond length is 2.21 Å. In the fourth Mn site, Mn(4) is bonded to one O(11), one O(13), one O(14), one O(2), and one O(4) atom to form distorted MnO5 trigonal bipyramids that share corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one P(3)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, and  an edgeedge with one Mn(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 72-73°. The Mn(4)-O(11) bond length is 2.14 Å. The Mn(4)-O(13) bond length is 2.10 Å. The Mn(4)-O(14) bond length is 2.36 Å. The Mn(4)-O(2) bond length is 2.19 Å. The Mn(4)-O(4) bond length is 2.12 Å. There are four 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(4) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O5 trigonal bipyramid, corners with two equivalent Mn(4)O5 trigonal bipyramids, and  an edgeedge with one Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles are 56°. The P(1)-O(1) bond length is 1.51 Å. The P(1)-O(2) bond length is 1.57 Å. The P(1)-O(3) bond length is 1.56 Å. The P(1)-O(4) bond length is 1.58 Å. In the second P site, P(2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one Mn(3)O5 trigonal bipyramid, and corners with two equivalent Mn(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 42-66°. The P(2)-O(5) bond length is 1.54 Å. The P(2)-O(6) bond length is 1.55 Å. The P(2)-O(7) bond length is 1.56 Å. The P(2)-O(8) bond length is 1.57 Å. In the third P site, P(3) is bonded to one O(10), one O(11), one O(12), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(4)O5 trigonal bipyramid, corners with two equivalent Mn(2)O5 trigonal bipyramids, and corners with two equivalent Mn(3)O5 trigonal bipyramids. The P(3)-O(10) bond length is 1.55 Å. The P(3)-O(11) bond length is 1.56 Å. The P(3)-O(12) bond length is 1.59 Å. The P(3)-O(9) bond length is 1.54 Å. In the fourth P site, P(4) is bonded to one O(13), one O(14), one O(15), and one O(16) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra, corners with two equivalent Mn(3)O5 trigonal bipyramids, and corners with two equivalent Mn(4)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 68°. The P(4)-O(13) bond length is 1.54 Å. The P(4)-O(14) bond length is 1.57 Å. The P(4)-O(15) bond length is 1.55 Å. The P(4)-O(16) bond length is 1.56 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Sr(1), one Sr(2), and one P(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Sr(2), one Mn(1), one Mn(4), and one P(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Mn(1), one Mn(2), and one P(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(1), one Mn(1), one Mn(4), and one P(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Sr(1), one Mn(2), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one Mn(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Mn(1), and one P(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), one Mn(2), one Mn(3), and one P(2) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), and one P(3) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Sr(2), one Mn(2), and one P(3) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Mn(3), one Mn(4), and one P(3) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Sr(1), one Mn(2), one Mn(3), and one P(3) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 150 degrees geometry to one Sr(2), one Mn(4), and one P(4) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Sr(1), one Mn(3), one Mn(4), and one P(4) atom. In the fifteenth O site, O(15) is bonded in a 2-coordinate geometry to one Sr(1), one Mn(1), and one P(4) atom. In the sixteenth O site, O(16) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Mn(3), and one P(4) atom.