Sr10Mg5Mo(W2O15)2 crystallizes in the triclinic P-1 space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(10), one O(11), one O(15), one O(3), one O(4), one O(6), two equivalent O(1), two equivalent O(13), and two equivalent O(8) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Sr(5)O12 cuboctahedra, corners with six equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(3)O12 cuboctahedra, faces with three equivalent Sr(4)O12 cuboctahedra,  a faceface with one Mg(1)O6 octahedra,  a faceface with one W(2)O6 octahedra, faces with three equivalent Mg(2)O6 octahedra, and faces with three equivalent W(1)O6 octahedra. In the second Sr site, Sr(2) is bonded to one O(11), one O(3), one O(6), three equivalent O(12), three equivalent O(2), and three equivalent O(7) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(3)O12 cuboctahedra, corners with six equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Sr(3)O12 cuboctahedra,  a faceface with one Mg(2)O6 octahedra, faces with three equivalent Mg(3)O6 octahedra, and faces with four equivalent W(2)O6 octahedra. In the third Sr site, Sr(3) is bonded to one O(1), one O(12), one O(13), one O(2), one O(7), one O(8), two equivalent O(11), two equivalent O(3), and two equivalent O(6) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Sr(4)O12 cuboctahedra, corners with six equivalent Sr(3)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra,  a faceface with one Mg(3)O6 octahedra,  a faceface with one W(1)O6 octahedra, faces with three equivalent Mg(2)O6 octahedra, and faces with three equivalent W(2)O6 octahedra. In the fourth Sr site, Sr(4) is bonded to one O(1), one O(13), one O(14), one O(5), one O(8), one O(9), two equivalent O(10), two equivalent O(15), and two equivalent O(4) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(3)O12 cuboctahedra, corners with three equivalent Sr(5)O12 cuboctahedra, corners with six equivalent Sr(4)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(5)O12 cuboctahedra,  a faceface with one Mg(2)O6 octahedra,  a faceface with one Mo(1)O6 octahedra, faces with three equivalent Mg(1)O6 octahedra, and faces with three equivalent W(1)O6 octahedra. In the fifth Sr site, Sr(5) is bonded to one O(10), one O(15), one O(4), three equivalent O(14), three equivalent O(5), and three equivalent O(9) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(4)O12 cuboctahedra, corners with six equivalent Sr(5)O12 cuboctahedra, faces with three equivalent Sr(4)O12 cuboctahedra, faces with three equivalent Sr(5)O12 cuboctahedra,  a faceface with one W(1)O6 octahedra, faces with three equivalent Mo(1)O6 octahedra, and faces with four equivalent Mg(1)O6 octahedra. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(10), one O(14), one O(15), one O(4), one O(5), and one O(9) atom to form MgO6 octahedra that share corners with three equivalent W(1)O6 octahedra, corners with three equivalent Mo(1)O6 octahedra,  a faceface with one Sr(1)O12 cuboctahedra, faces with three equivalent Sr(4)O12 cuboctahedra, and faces with four equivalent Sr(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-15°. In the second Mg site, Mg(2) is bonded to one O(1), one O(11), one O(13), one O(3), one O(6), and one O(8) atom to form MgO6 octahedra that share corners with three equivalent W(1)O6 octahedra, corners with three equivalent W(2)O6 octahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, and faces with three equivalent Sr(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-16°. In the third Mg site, Mg(3) is bonded to two equivalent O(12), two equivalent O(2), and two equivalent O(7) atoms to form MgO6 octahedra that share corners with six equivalent W(2)O6 octahedra, faces with two equivalent Sr(3)O12 cuboctahedra, and faces with six equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-15°. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(10), one O(13), one O(15), one O(4), and one O(8) atom to form WO6 octahedra that share corners with three equivalent Mg(1)O6 octahedra, corners with three equivalent Mg(2)O6 octahedra,  a faceface with one Sr(3)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, and faces with three equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-16°. In the second W site, W(2) is bonded to one O(11), one O(12), one O(2), one O(3), one O(6), and one O(7) atom to form WO6 octahedra that share corners with three equivalent Mg(2)O6 octahedra, corners with three equivalent Mg(3)O6 octahedra,  a faceface with one Sr(1)O12 cuboctahedra, faces with three equivalent Sr(3)O12 cuboctahedra, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-15°. Mo(1) is bonded to two equivalent O(14), two equivalent O(5), and two equivalent O(9) atoms to form MoO6 octahedra that share corners with six equivalent Mg(1)O6 octahedra, faces with two equivalent Sr(4)O12 cuboctahedra, and faces with six equivalent Sr(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-15°. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded to one Sr(3), one Sr(4), two equivalent Sr(1), one Mg(2), and one W(1) atom to form distorted OSr4MgW octahedra that share  a cornercorner with one O(5)Sr4MgMo octahedra,  a cornercorner with one O(2)Sr4MgW octahedra,  a cornercorner with one O(3)Sr4MgW octahedra,  a cornercorner with one O(4)Sr4MgW octahedra, corners with two equivalent O(1)Sr4MgW octahedra, edges with two equivalent O(3)Sr4MgW octahedra, and edges with two equivalent O(4)Sr4MgW octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the second O site, O(2) is bonded to one Sr(3), three equivalent Sr(2), one Mg(3), and one W(2) atom to form a mixture of distorted corner and edge-sharing OSr4MgW octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), two equivalent Sr(3), one Mg(2), and one W(2) atom to form a mixture of distorted corner and edge-sharing OSr4MgW octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(5), two equivalent Sr(4), one Mg(1), and one W(1) atom to form distorted OSr4MgW octahedra that share  a cornercorner with one O(1)Sr4MgW octahedra,  a cornercorner with one O(3)Sr4MgW octahedra, corners with two equivalent O(5)Sr4MgMo octahedra, corners with two equivalent O(4)Sr4MgW octahedra, edges with two equivalent O(5)Sr4MgMo octahedra, and edges with two equivalent O(1)Sr4MgW octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the fifth O site, O(5) is bonded to one Sr(4), three equivalent Sr(5), one Mg(1), and one Mo(1) atom to form distorted OSr4MgMo octahedra that share  a cornercorner with one O(1)Sr4MgW octahedra, corners with two equivalent O(4)Sr4MgW octahedra, corners with three equivalent O(5)Sr4MgMo octahedra, edges with two equivalent O(5)Sr4MgMo octahedra, and edges with two equivalent O(4)Sr4MgW octahedra. The corner-sharing octahedral tilt angles range from 0-4°. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), two equivalent Sr(3), one Mg(2), and one W(2) atom. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Sr(3), three equivalent Sr(2), one Mg(3), and one W(2) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Sr(3), one Sr(4), two equivalent Sr(1), one Mg(2), and one W(1) atom. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to one Sr(4), three equivalent Sr(5), one Mg(1), and one Mo(1) atom. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(5), two equivalent Sr(4), one Mg(1), and one W(1) atom. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), two equivalent Sr(3), one Mg(2), and one W(2) atom. In the twelfth O site, O(12) is bonded in a 6-coordinate geometry to one Sr(3), three equivalent Sr(2), one Mg(3), and one W(2) atom. In the thirteenth O site, O(13) is bonded in a 6-coordinate geometry to one Sr(3), one Sr(4), two equivalent Sr(1), one Mg(2), and one W(1) atom. In the fourteenth O site, O(14) is bonded in a 6-coordinate geometry to one Sr(4), three equivalent Sr(5), one Mg(1), and one Mo(1) atom. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(5), two equivalent Sr(4), one Mg(1), and one W(1) atom.
Sr10Mg5Mo(W2O15)2 crystallizes in the triclinic P-1 space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(10), one O(11), one O(15), one O(3), one O(4), one O(6), two equivalent O(1), two equivalent O(13), and two equivalent O(8) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Sr(5)O12 cuboctahedra, corners with six equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(3)O12 cuboctahedra, faces with three equivalent Sr(4)O12 cuboctahedra,  a faceface with one Mg(1)O6 octahedra,  a faceface with one W(2)O6 octahedra, faces with three equivalent Mg(2)O6 octahedra, and faces with three equivalent W(1)O6 octahedra. The Sr(1)-O(10) bond length is 3.06 Å. The Sr(1)-O(11) bond length is 2.95 Å. The Sr(1)-O(15) bond length is 2.74 Å. The Sr(1)-O(3) bond length is 2.92 Å. The Sr(1)-O(4) bond length is 2.75 Å. The Sr(1)-O(6) bond length is 2.64 Å. There is one shorter (2.77 Å) and one longer (2.90 Å) Sr(1)-O(1) bond length. There is one shorter (2.60 Å) and one longer (3.09 Å) Sr(1)-O(13) bond length. There is one shorter (2.68 Å) and one longer (3.01 Å) Sr(1)-O(8) bond length. In the second Sr site, Sr(2) is bonded to one O(11), one O(3), one O(6), three equivalent O(12), three equivalent O(2), and three equivalent O(7) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(3)O12 cuboctahedra, corners with six equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra, faces with three equivalent Sr(3)O12 cuboctahedra,  a faceface with one Mg(2)O6 octahedra, faces with three equivalent Mg(3)O6 octahedra, and faces with four equivalent W(2)O6 octahedra. The Sr(2)-O(11) bond length is 2.74 Å. The Sr(2)-O(3) bond length is 2.74 Å. The Sr(2)-O(6) bond length is 3.05 Å. There are a spread of Sr(2)-O(12) bond distances ranging from 2.60-3.09 Å. There are a spread of Sr(2)-O(2) bond distances ranging from 2.77-2.92 Å. There are a spread of Sr(2)-O(7) bond distances ranging from 2.64-3.01 Å. In the third Sr site, Sr(3) is bonded to one O(1), one O(12), one O(13), one O(2), one O(7), one O(8), two equivalent O(11), two equivalent O(3), and two equivalent O(6) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Sr(4)O12 cuboctahedra, corners with six equivalent Sr(3)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(2)O12 cuboctahedra,  a faceface with one Mg(3)O6 octahedra,  a faceface with one W(1)O6 octahedra, faces with three equivalent Mg(2)O6 octahedra, and faces with three equivalent W(2)O6 octahedra. The Sr(3)-O(1) bond length is 2.92 Å. The Sr(3)-O(12) bond length is 2.74 Å. The Sr(3)-O(13) bond length is 2.95 Å. The Sr(3)-O(2) bond length is 2.74 Å. The Sr(3)-O(7) bond length is 3.05 Å. The Sr(3)-O(8) bond length is 2.64 Å. There is one shorter (2.60 Å) and one longer (3.09 Å) Sr(3)-O(11) bond length. There is one shorter (2.77 Å) and one longer (2.90 Å) Sr(3)-O(3) bond length. There is one shorter (2.68 Å) and one longer (3.01 Å) Sr(3)-O(6) bond length. In the fourth Sr site, Sr(4) is bonded to one O(1), one O(13), one O(14), one O(5), one O(8), one O(9), two equivalent O(10), two equivalent O(15), and two equivalent O(4) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(3)O12 cuboctahedra, corners with three equivalent Sr(5)O12 cuboctahedra, corners with six equivalent Sr(4)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, faces with three equivalent Sr(5)O12 cuboctahedra,  a faceface with one Mg(2)O6 octahedra,  a faceface with one Mo(1)O6 octahedra, faces with three equivalent Mg(1)O6 octahedra, and faces with three equivalent W(1)O6 octahedra. The Sr(4)-O(1) bond length is 2.76 Å. The Sr(4)-O(13) bond length is 2.75 Å. The Sr(4)-O(14) bond length is 2.94 Å. The Sr(4)-O(5) bond length is 2.90 Å. The Sr(4)-O(8) bond length is 3.07 Å. The Sr(4)-O(9) bond length is 2.63 Å. There is one shorter (2.68 Å) and one longer (3.00 Å) Sr(4)-O(10) bond length. There is one shorter (2.60 Å) and one longer (3.10 Å) Sr(4)-O(15) bond length. There is one shorter (2.77 Å) and one longer (2.90 Å) Sr(4)-O(4) bond length. In the fifth Sr site, Sr(5) is bonded to one O(10), one O(15), one O(4), three equivalent O(14), three equivalent O(5), and three equivalent O(9) atoms to form distorted SrO12 cuboctahedra that share corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(4)O12 cuboctahedra, corners with six equivalent Sr(5)O12 cuboctahedra, faces with three equivalent Sr(4)O12 cuboctahedra, faces with three equivalent Sr(5)O12 cuboctahedra,  a faceface with one W(1)O6 octahedra, faces with three equivalent Mo(1)O6 octahedra, and faces with four equivalent Mg(1)O6 octahedra. The Sr(5)-O(10) bond length is 2.65 Å. The Sr(5)-O(15) bond length is 2.96 Å. The Sr(5)-O(4) bond length is 2.93 Å. There are a spread of Sr(5)-O(14) bond distances ranging from 2.60-3.09 Å. There are a spread of Sr(5)-O(5) bond distances ranging from 2.73-2.90 Å. There are a spread of Sr(5)-O(9) bond distances ranging from 2.68-3.04 Å. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to one O(10), one O(14), one O(15), one O(4), one O(5), and one O(9) atom to form MgO6 octahedra that share corners with three equivalent W(1)O6 octahedra, corners with three equivalent Mo(1)O6 octahedra,  a faceface with one Sr(1)O12 cuboctahedra, faces with three equivalent Sr(4)O12 cuboctahedra, and faces with four equivalent Sr(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-15°. The Mg(1)-O(10) bond length is 2.08 Å. The Mg(1)-O(14) bond length is 2.09 Å. The Mg(1)-O(15) bond length is 2.08 Å. The Mg(1)-O(4) bond length is 2.08 Å. The Mg(1)-O(5) bond length is 2.09 Å. The Mg(1)-O(9) bond length is 2.09 Å. In the second Mg site, Mg(2) is bonded to one O(1), one O(11), one O(13), one O(3), one O(6), and one O(8) atom to form MgO6 octahedra that share corners with three equivalent W(1)O6 octahedra, corners with three equivalent W(2)O6 octahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Sr(4)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, and faces with three equivalent Sr(3)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-16°. The Mg(2)-O(1) bond length is 2.08 Å. The Mg(2)-O(11) bond length is 2.08 Å. The Mg(2)-O(13) bond length is 2.08 Å. The Mg(2)-O(3) bond length is 2.08 Å. The Mg(2)-O(6) bond length is 2.08 Å. The Mg(2)-O(8) bond length is 2.08 Å. In the third Mg site, Mg(3) is bonded to two equivalent O(12), two equivalent O(2), and two equivalent O(7) atoms to form MgO6 octahedra that share corners with six equivalent W(2)O6 octahedra, faces with two equivalent Sr(3)O12 cuboctahedra, and faces with six equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-15°. Both Mg(3)-O(12) bond lengths are 2.08 Å. Both Mg(3)-O(2) bond lengths are 2.08 Å. Both Mg(3)-O(7) bond lengths are 2.08 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(10), one O(13), one O(15), one O(4), and one O(8) atom to form WO6 octahedra that share corners with three equivalent Mg(1)O6 octahedra, corners with three equivalent Mg(2)O6 octahedra,  a faceface with one Sr(3)O12 cuboctahedra,  a faceface with one Sr(5)O12 cuboctahedra, faces with three equivalent Sr(1)O12 cuboctahedra, and faces with three equivalent Sr(4)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-16°. The W(1)-O(1) bond length is 1.95 Å. The W(1)-O(10) bond length is 1.96 Å. The W(1)-O(13) bond length is 1.95 Å. The W(1)-O(15) bond length is 1.96 Å. The W(1)-O(4) bond length is 1.96 Å. The W(1)-O(8) bond length is 1.95 Å. In the second W site, W(2) is bonded to one O(11), one O(12), one O(2), one O(3), one O(6), and one O(7) atom to form WO6 octahedra that share corners with three equivalent Mg(2)O6 octahedra, corners with three equivalent Mg(3)O6 octahedra,  a faceface with one Sr(1)O12 cuboctahedra, faces with three equivalent Sr(3)O12 cuboctahedra, and faces with four equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-15°. The W(2)-O(11) bond length is 1.95 Å. The W(2)-O(12) bond length is 1.95 Å. The W(2)-O(2) bond length is 1.95 Å. The W(2)-O(3) bond length is 1.96 Å. The W(2)-O(6) bond length is 1.95 Å. The W(2)-O(7) bond length is 1.95 Å. Mo(1) is bonded to two equivalent O(14), two equivalent O(5), and two equivalent O(9) atoms to form MoO6 octahedra that share corners with six equivalent Mg(1)O6 octahedra, faces with two equivalent Sr(4)O12 cuboctahedra, and faces with six equivalent Sr(5)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 6-15°. Both Mo(1)-O(14) bond lengths are 1.95 Å. Both Mo(1)-O(5) bond lengths are 1.95 Å. Both Mo(1)-O(9) bond lengths are 1.95 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded to one Sr(3), one Sr(4), two equivalent Sr(1), one Mg(2), and one W(1) atom to form distorted OSr4MgW octahedra that share  a cornercorner with one O(5)Sr4MgMo octahedra,  a cornercorner with one O(2)Sr4MgW octahedra,  a cornercorner with one O(3)Sr4MgW octahedra,  a cornercorner with one O(4)Sr4MgW octahedra, corners with two equivalent O(1)Sr4MgW octahedra, edges with two equivalent O(3)Sr4MgW octahedra, and edges with two equivalent O(4)Sr4MgW octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the second O site, O(2) is bonded to one Sr(3), three equivalent Sr(2), one Mg(3), and one W(2) atom to form a mixture of distorted corner and edge-sharing OSr4MgW octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the third O site, O(3) is bonded to one Sr(1), one Sr(2), two equivalent Sr(3), one Mg(2), and one W(2) atom to form a mixture of distorted corner and edge-sharing OSr4MgW octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the fourth O site, O(4) is bonded to one Sr(1), one Sr(5), two equivalent Sr(4), one Mg(1), and one W(1) atom to form distorted OSr4MgW octahedra that share  a cornercorner with one O(1)Sr4MgW octahedra,  a cornercorner with one O(3)Sr4MgW octahedra, corners with two equivalent O(5)Sr4MgMo octahedra, corners with two equivalent O(4)Sr4MgW octahedra, edges with two equivalent O(5)Sr4MgMo octahedra, and edges with two equivalent O(1)Sr4MgW octahedra. The corner-sharing octahedral tilt angles range from 0-5°. In the fifth O site, O(5) is bonded to one Sr(4), three equivalent Sr(5), one Mg(1), and one Mo(1) atom to form distorted OSr4MgMo octahedra that share  a cornercorner with one O(1)Sr4MgW octahedra, corners with two equivalent O(4)Sr4MgW octahedra, corners with three equivalent O(5)Sr4MgMo octahedra, edges with two equivalent O(5)Sr4MgMo octahedra, and edges with two equivalent O(4)Sr4MgW octahedra. The corner-sharing octahedral tilt angles range from 0-4°. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), two equivalent Sr(3), one Mg(2), and one W(2) atom. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one Sr(3), three equivalent Sr(2), one Mg(3), and one W(2) atom. In the eighth O site, O(8) is bonded in a 6-coordinate geometry to one Sr(3), one Sr(4), two equivalent Sr(1), one Mg(2), and one W(1) atom. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to one Sr(4), three equivalent Sr(5), one Mg(1), and one Mo(1) atom. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(5), two equivalent Sr(4), one Mg(1), and one W(1) atom. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), two equivalent Sr(3), one Mg(2), and one W(2) atom. In the twelfth O site, O(12) is bonded in a 6-coordinate geometry to one Sr(3), three equivalent Sr(2), one Mg(3), and one W(2) atom. In the thirteenth O site, O(13) is bonded in a 6-coordinate geometry to one Sr(3), one Sr(4), two equivalent Sr(1), one Mg(2), and one W(1) atom. In the fourteenth O site, O(14) is bonded in a 6-coordinate geometry to one Sr(4), three equivalent Sr(5), one Mg(1), and one Mo(1) atom. In the fifteenth O site, O(15) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(5), two equivalent Sr(4), one Mg(1), and one W(1) atom.