Sr3TiGa10O20 crystallizes in the monoclinic C2/m 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(5), two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(6) atoms. Ti(1) is bonded to two equivalent O(5) and four equivalent O(2) atoms to form TiO6 octahedra that share corners with four equivalent Ga(3)O4 tetrahedra and edges with four equivalent Ga(2)O6 octahedra. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form GaO4 tetrahedra that share  a cornercorner with one Ga(2)O6 octahedra,  a cornercorner with one Ga(1)O4 tetrahedra, and corners with three equivalent Ga(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 52°. In the second Ga site, Ga(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form GaO6 octahedra that share corners with two equivalent Ga(1)O4 tetrahedra, corners with four equivalent Ga(3)O4 tetrahedra,  an edgeedge with one Ga(2)O6 octahedra, and edges with two equivalent Ti(1)O6 octahedra. In the third Ga site, Ga(3) is bonded to one O(2), one O(3), one O(4), and one O(6) atom to form GaO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra, corners with two equivalent Ga(2)O6 octahedra, and corners with three equivalent Ga(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-63°. There are six inequivalent O sites. In the first O site, O(3) is bonded in a trigonal planar geometry to one Ga(1), one Ga(2), and one Ga(3) atom. In the second O site, O(4) is bonded in a distorted trigonal planar geometry to one Sr(1), one Ga(1), and one Ga(3) atom. In the third O site, O(5) is bonded to one Sr(1), one Ti(1), and two equivalent Ga(2) atoms to form distorted OSrTiGa2 tetrahedra that share  a cornercorner with one O(5)SrTiGa2 tetrahedra, corners with two equivalent O(6)Sr2Ga2 tetrahedra, and  an edgeedge with one O(5)SrTiGa2 tetrahedra. In the fourth O site, O(6) is bonded to one Sr(1), one Sr(2), one Ga(1), and one Ga(3) atom to form distorted OSr2Ga2 tetrahedra that share  a cornercorner with one O(5)SrTiGa2 tetrahedra, corners with two equivalent O(6)Sr2Ga2 tetrahedra, and  an edgeedge with one O(6)Sr2Ga2 tetrahedra. In the fifth O site, O(1) is bonded in a trigonal planar geometry to one Sr(2) and two equivalent Ga(1) atoms. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to one Sr(1), one Ti(1), one Ga(2), and one Ga(3) atom.
Sr3TiGa10O20 crystallizes in the monoclinic C2/m 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(5), two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms. The Sr(1)-O(5) bond length is 2.48 Å. Both Sr(1)-O(2) bond lengths are 3.09 Å. Both Sr(1)-O(4) bond lengths are 2.55 Å. Both Sr(1)-O(6) bond lengths are 2.71 Å. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(6) atoms. Both Sr(2)-O(1) bond lengths are 2.51 Å. All Sr(2)-O(6) bond lengths are 2.75 Å. Ti(1) is bonded to two equivalent O(5) and four equivalent O(2) atoms to form TiO6 octahedra that share corners with four equivalent Ga(3)O4 tetrahedra and edges with four equivalent Ga(2)O6 octahedra. Both Ti(1)-O(5) bond lengths are 1.94 Å. All Ti(1)-O(2) bond lengths are 2.01 Å. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form GaO4 tetrahedra that share  a cornercorner with one Ga(2)O6 octahedra,  a cornercorner with one Ga(1)O4 tetrahedra, and corners with three equivalent Ga(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 52°. The Ga(1)-O(1) bond length is 1.85 Å. The Ga(1)-O(3) bond length is 1.88 Å. The Ga(1)-O(4) bond length is 1.84 Å. The Ga(1)-O(6) bond length is 1.86 Å. In the second Ga site, Ga(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form GaO6 octahedra that share corners with two equivalent Ga(1)O4 tetrahedra, corners with four equivalent Ga(3)O4 tetrahedra,  an edgeedge with one Ga(2)O6 octahedra, and edges with two equivalent Ti(1)O6 octahedra. Both Ga(2)-O(2) bond lengths are 2.00 Å. Both Ga(2)-O(3) bond lengths are 1.96 Å. Both Ga(2)-O(5) bond lengths are 2.09 Å. In the third Ga site, Ga(3) is bonded to one O(2), one O(3), one O(4), and one O(6) atom to form GaO4 tetrahedra that share  a cornercorner with one Ti(1)O6 octahedra, corners with two equivalent Ga(2)O6 octahedra, and corners with three equivalent Ga(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-63°. The Ga(3)-O(2) bond length is 1.86 Å. The Ga(3)-O(3) bond length is 1.89 Å. The Ga(3)-O(4) bond length is 1.84 Å. The Ga(3)-O(6) bond length is 1.87 Å. There are six inequivalent O sites. In the first O site, O(3) is bonded in a trigonal planar geometry to one Ga(1), one Ga(2), and one Ga(3) atom. In the second O site, O(4) is bonded in a distorted trigonal planar geometry to one Sr(1), one Ga(1), and one Ga(3) atom. In the third O site, O(5) is bonded to one Sr(1), one Ti(1), and two equivalent Ga(2) atoms to form distorted OSrTiGa2 tetrahedra that share  a cornercorner with one O(5)SrTiGa2 tetrahedra, corners with two equivalent O(6)Sr2Ga2 tetrahedra, and  an edgeedge with one O(5)SrTiGa2 tetrahedra. In the fourth O site, O(6) is bonded to one Sr(1), one Sr(2), one Ga(1), and one Ga(3) atom to form distorted OSr2Ga2 tetrahedra that share  a cornercorner with one O(5)SrTiGa2 tetrahedra, corners with two equivalent O(6)Sr2Ga2 tetrahedra, and  an edgeedge with one O(6)Sr2Ga2 tetrahedra. In the fifth O site, O(1) is bonded in a trigonal planar geometry to one Sr(2) and two equivalent Ga(1) atoms. In the sixth O site, O(2) is bonded in a 3-coordinate geometry to one Sr(1), one Ti(1), one Ga(2), and one Ga(3) atom.