Sr4MgIn2(SbO6)2 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(3), one O(4), one O(6), and one O(9) atom. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(3), one O(4), one O(5), one O(6), and one O(9) atom. In the third Sr site, Sr(3) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(12), one O(2), one O(7), one O(8), and one O(9) atom. In the fourth Sr site, Sr(4) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(2), one O(4), one O(5), one O(7), and one O(8) atom. Mg(1) is bonded to one O(11), one O(2), one O(3), and one O(5) atom to form distorted MgO4 tetrahedra that share  a cornercorner with one In(1)O6 octahedra,  a cornercorner with one In(2)O5 square pyramid, and  an edgeedge with one In(2)O5 square pyramid. The corner-sharing octahedral tilt angles are 3°. There are two inequivalent In sites. In the first In site, In(1) is bonded to one O(1), one O(10), one O(12), one O(3), one O(4), and one O(7) atom to form InO6 octahedra that share corners with four equivalent Sb(1)O6 octahedra and  a cornercorner with one Mg(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 24-32°. In the second In site, In(2) is bonded to one O(11), one O(2), one O(5), one O(8), and one O(9) atom to form distorted InO5 square pyramids that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Mg(1)O4 tetrahedra, and  an edgeedge with one Mg(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 36°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(1), one O(10), one O(12), one O(4), one O(6), and one O(8) atom to form SbO6 octahedra that share corners with four equivalent In(1)O6 octahedra and  a cornercorner with one In(2)O5 square pyramid. The corner-sharing octahedral tilt angles range from 24-32°. In the second Sb site, Sb(2) is bonded in a 3-coordinate geometry to one O(2), one O(5), one O(7), and one O(9) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Sr(2), one Sr(3), one Sr(4), one In(1), and one Sb(1) atom to form a mixture of distorted corner and edge-sharing OSr3InSb trigonal bipyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Sr(3), one Sr(4), one Mg(1), one In(2), and one Sb(2) atom. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to one Sr(1), one Sr(2), one Mg(1), and one In(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(4), one In(1), and one Sb(1) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(4), one Mg(1), one In(2), and one Sb(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Sr(2), and one Sb(1) atom. In the seventh O site, O(7) is bonded in a distorted see-saw-like geometry to one Sr(3), one Sr(4), one In(1), and one Sb(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(4), one In(2), and one Sb(1) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one In(2), and one Sb(2) atom. In the tenth O site, O(10) is bonded to one Sr(1), one Sr(2), one In(1), and one Sb(1) atom to form distorted OSr2InSb trigonal pyramids that share corners with two equivalent O(12)Sr2InSb tetrahedra,  a cornercorner with one O(1)Sr3InSb trigonal bipyramid, and  an edgeedge with one O(1)Sr3InSb trigonal bipyramid. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Mg(1), and one In(2) atom. In the twelfth O site, O(12) is bonded to one Sr(3), one Sr(4), one In(1), and one Sb(1) atom to form distorted OSr2InSb tetrahedra that share corners with two equivalent O(10)Sr2InSb trigonal pyramids and edges with two equivalent O(1)Sr3InSb trigonal bipyramids.
Sr4MgIn2(SbO6)2 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(3), one O(4), one O(6), and one O(9) atom. The Sr(1)-O(10) bond length is 2.56 Å. The Sr(1)-O(11) bond length is 2.61 Å. The Sr(1)-O(3) bond length is 2.75 Å. The Sr(1)-O(4) bond length is 2.75 Å. The Sr(1)-O(6) bond length is 2.56 Å. The Sr(1)-O(9) bond length is 3.10 Å. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(3), one O(4), one O(5), one O(6), and one O(9) atom. The Sr(2)-O(1) bond length is 2.75 Å. The Sr(2)-O(10) bond length is 2.49 Å. The Sr(2)-O(3) bond length is 2.51 Å. The Sr(2)-O(4) bond length is 2.49 Å. The Sr(2)-O(5) bond length is 2.91 Å. The Sr(2)-O(6) bond length is 2.60 Å. The Sr(2)-O(9) bond length is 3.02 Å. In the third Sr site, Sr(3) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(12), one O(2), one O(7), one O(8), and one O(9) atom. The Sr(3)-O(1) bond length is 2.67 Å. The Sr(3)-O(11) bond length is 2.59 Å. The Sr(3)-O(12) bond length is 2.55 Å. The Sr(3)-O(2) bond length is 2.80 Å. The Sr(3)-O(7) bond length is 2.66 Å. The Sr(3)-O(8) bond length is 2.66 Å. The Sr(3)-O(9) bond length is 2.90 Å. In the fourth Sr site, Sr(4) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(2), one O(4), one O(5), one O(7), and one O(8) atom. The Sr(4)-O(1) bond length is 2.47 Å. The Sr(4)-O(12) bond length is 2.53 Å. The Sr(4)-O(2) bond length is 2.48 Å. The Sr(4)-O(4) bond length is 2.89 Å. The Sr(4)-O(5) bond length is 2.85 Å. The Sr(4)-O(7) bond length is 2.49 Å. The Sr(4)-O(8) bond length is 2.69 Å. Mg(1) is bonded to one O(11), one O(2), one O(3), and one O(5) atom to form distorted MgO4 tetrahedra that share  a cornercorner with one In(1)O6 octahedra,  a cornercorner with one In(2)O5 square pyramid, and  an edgeedge with one In(2)O5 square pyramid. The corner-sharing octahedral tilt angles are 3°. The Mg(1)-O(11) bond length is 1.96 Å. The Mg(1)-O(2) bond length is 1.96 Å. The Mg(1)-O(3) bond length is 1.94 Å. The Mg(1)-O(5) bond length is 1.97 Å. There are two inequivalent In sites. In the first In site, In(1) is bonded to one O(1), one O(10), one O(12), one O(3), one O(4), and one O(7) atom to form InO6 octahedra that share corners with four equivalent Sb(1)O6 octahedra and  a cornercorner with one Mg(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 24-32°. The In(1)-O(1) bond length is 2.31 Å. The In(1)-O(10) bond length is 2.32 Å. The In(1)-O(12) bond length is 2.28 Å. The In(1)-O(3) bond length is 2.10 Å. The In(1)-O(4) bond length is 2.30 Å. The In(1)-O(7) bond length is 2.21 Å. In the second In site, In(2) is bonded to one O(11), one O(2), one O(5), one O(8), and one O(9) atom to form distorted InO5 square pyramids that share  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Mg(1)O4 tetrahedra, and  an edgeedge with one Mg(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 36°. The In(2)-O(11) bond length is 2.10 Å. The In(2)-O(2) bond length is 2.14 Å. The In(2)-O(5) bond length is 2.33 Å. The In(2)-O(8) bond length is 2.20 Å. The In(2)-O(9) bond length is 2.11 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(1), one O(10), one O(12), one O(4), one O(6), and one O(8) atom to form SbO6 octahedra that share corners with four equivalent In(1)O6 octahedra and  a cornercorner with one In(2)O5 square pyramid. The corner-sharing octahedral tilt angles range from 24-32°. The Sb(1)-O(1) bond length is 2.08 Å. The Sb(1)-O(10) bond length is 2.10 Å. The Sb(1)-O(12) bond length is 2.08 Å. The Sb(1)-O(4) bond length is 2.07 Å. The Sb(1)-O(6) bond length is 1.98 Å. The Sb(1)-O(8) bond length is 2.04 Å. In the second Sb site, Sb(2) is bonded in a 3-coordinate geometry to one O(2), one O(5), one O(7), and one O(9) atom. The Sb(2)-O(2) bond length is 2.59 Å. The Sb(2)-O(5) bond length is 2.03 Å. The Sb(2)-O(7) bond length is 2.00 Å. The Sb(2)-O(9) bond length is 2.00 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Sr(2), one Sr(3), one Sr(4), one In(1), and one Sb(1) atom to form a mixture of distorted corner and edge-sharing OSr3InSb trigonal bipyramids. In the second O site, O(2) is bonded in a 5-coordinate geometry to one Sr(3), one Sr(4), one Mg(1), one In(2), and one Sb(2) atom. In the third O site, O(3) is bonded in a distorted see-saw-like geometry to one Sr(1), one Sr(2), one Mg(1), and one In(1) atom. In the fourth O site, O(4) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(4), one In(1), and one Sb(1) atom. In the fifth O site, O(5) is bonded in a 5-coordinate geometry to one Sr(2), one Sr(4), one Mg(1), one In(2), and one Sb(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Sr(1), one Sr(2), and one Sb(1) atom. In the seventh O site, O(7) is bonded in a distorted see-saw-like geometry to one Sr(3), one Sr(4), one In(1), and one Sb(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(3), one Sr(4), one In(2), and one Sb(1) atom. In the ninth O site, O(9) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one In(2), and one Sb(2) atom. In the tenth O site, O(10) is bonded to one Sr(1), one Sr(2), one In(1), and one Sb(1) atom to form distorted OSr2InSb trigonal pyramids that share corners with two equivalent O(12)Sr2InSb tetrahedra,  a cornercorner with one O(1)Sr3InSb trigonal bipyramid, and  an edgeedge with one O(1)Sr3InSb trigonal bipyramid. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), one Mg(1), and one In(2) atom. In the twelfth O site, O(12) is bonded to one Sr(3), one Sr(4), one In(1), and one Sb(1) atom to form distorted OSr2InSb tetrahedra that share corners with two equivalent O(10)Sr2InSb trigonal pyramids and edges with two equivalent O(1)Sr3InSb trigonal bipyramids.