Ba2Sr2CaTi5O15 is (Cubic) Perovskite-derived structured and crystallizes in the monoclinic Pm space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to one O(12), one O(13), one O(14), one O(15), two equivalent O(10), two equivalent O(2), two equivalent O(4), and two equivalent O(9) atoms to form BaO12 cuboctahedra that share corners with three equivalent Ba(2)O12 cuboctahedra, corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Ca(1)O12 cuboctahedra,  a faceface with one Ba(2)O12 cuboctahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Ca(1)O12 cuboctahedra, faces with two equivalent Ba(1)O12 cuboctahedra, faces with two equivalent Ti(2)O6 octahedra, faces with two equivalent Ti(3)O6 octahedra, faces with two equivalent Ti(4)O6 octahedra, and faces with two equivalent Ti(5)O6 octahedra. In the second Ba site, Ba(2) is bonded to one O(11), one O(13), one O(14), one O(15), two equivalent O(10), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms to form BaO12 cuboctahedra that share corners with three equivalent Ba(1)O12 cuboctahedra, corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Ca(1)O12 cuboctahedra,  a faceface with one Ba(1)O12 cuboctahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Ca(1)O12 cuboctahedra, faces with two equivalent Ba(2)O12 cuboctahedra, faces with two equivalent Ti(1)O6 octahedra, faces with two equivalent Ti(3)O6 octahedra, faces with two equivalent Ti(4)O6 octahedra, and faces with two equivalent Ti(5)O6 octahedra. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(11), one O(12), one O(14), one O(15), two equivalent O(1), two equivalent O(4), two equivalent O(6), and two equivalent O(7) atoms to form SrO12 cuboctahedra that share corners with three equivalent Ba(1)O12 cuboctahedra, corners with three equivalent Ba(2)O12 cuboctahedra, corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Ca(1)O12 cuboctahedra,  a faceface with one Ba(1)O12 cuboctahedra,  a faceface with one Ba(2)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Ca(1)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Ti(1)O6 octahedra, faces with two equivalent Ti(2)O6 octahedra, faces with two equivalent Ti(4)O6 octahedra, and faces with two equivalent Ti(5)O6 octahedra. In the second Sr site, Sr(2) is bonded to one O(11), one O(12), one O(13), one O(15), two equivalent O(2), two equivalent O(5), two equivalent O(7), and two equivalent O(8) atoms to form SrO12 cuboctahedra that share corners with three equivalent Ba(1)O12 cuboctahedra, corners with three equivalent Ba(2)O12 cuboctahedra, corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Ca(1)O12 cuboctahedra,  a faceface with one Ba(1)O12 cuboctahedra,  a faceface with one Ba(2)O12 cuboctahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Ca(1)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, faces with two equivalent Ti(1)O6 octahedra, faces with two equivalent Ti(2)O6 octahedra, faces with two equivalent Ti(3)O6 octahedra, and faces with two equivalent Ti(5)O6 octahedra. Ca(1) is bonded to one O(11), one O(12), one O(13), one O(14), two equivalent O(1), two equivalent O(3), two equivalent O(8), and two equivalent O(9) atoms to form CaO12 cuboctahedra that share corners with three equivalent Ba(1)O12 cuboctahedra, corners with three equivalent Ba(2)O12 cuboctahedra, corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(2)O12 cuboctahedra,  a faceface with one Ba(1)O12 cuboctahedra,  a faceface with one Ba(2)O12 cuboctahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra, faces with two equivalent Ca(1)O12 cuboctahedra, faces with two equivalent Ti(1)O6 octahedra, faces with two equivalent Ti(2)O6 octahedra, faces with two equivalent Ti(3)O6 octahedra, and faces with two equivalent Ti(4)O6 octahedra. There are five inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(5), one O(6), one O(8), and two equivalent O(11) atoms to form TiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra, corners with two equivalent Ti(1)O6 octahedra, faces with two equivalent Ba(2)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, and faces with two equivalent Ca(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-2°. In the second Ti site, Ti(2) is bonded to one O(1), one O(2), one O(7), one O(9), and two equivalent O(12) atoms to form TiO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, faces with two equivalent Ba(1)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, and faces with two equivalent Ca(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the third Ti site, Ti(3) is bonded to one O(10), one O(2), one O(3), one O(8), and two equivalent O(13) atoms to form TiO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra, corners with two equivalent Ti(3)O6 octahedra, faces with two equivalent Ba(1)O12 cuboctahedra, faces with two equivalent Ba(2)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, and faces with two equivalent Ca(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-3°. In the fourth Ti site, Ti(4) is bonded to one O(3), one O(4), one O(6), one O(9), and two equivalent O(14) atoms to form TiO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra, corners with two equivalent Ti(4)O6 octahedra, faces with two equivalent Ba(1)O12 cuboctahedra, faces with two equivalent Ba(2)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with two equivalent Ca(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-3°. In the fifth Ti site, Ti(5) is bonded to one O(10), one O(4), one O(5), one O(7), and two equivalent O(15) atoms to form TiO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(4)O6 octahedra, corners with two equivalent Ti(5)O6 octahedra, faces with two equivalent Ba(1)O12 cuboctahedra, faces with two equivalent Ba(2)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with two equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-2°. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Ca(1), one Ti(1), and one Ti(2) atom. In the second O site, O(2) is bonded to two equivalent Ba(1), two equivalent Sr(2), one Ti(2), and one Ti(3) atom to form distorted OBa2Sr2Ti2 octahedra that share corners with two equivalent O(5)Ba2Sr2Ti2 octahedra, corners with two equivalent O(10)Ba4Ti2 octahedra,  an edgeedge with one O(5)Ba2Sr2Ti2 octahedra, edges with two equivalent O(2)Ba2Sr2Ti2 octahedra, and  a faceface with one O(10)Ba4Ti2 octahedra. The corner-sharing octahedral tilt angles range from 0-60°. In the third O site, O(3) is bonded in a distorted linear geometry to two equivalent Ba(2), two equivalent Ca(1), one Ti(3), and one Ti(4) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to two equivalent Ba(1), two equivalent Sr(1), one Ti(4), and one Ti(5) atom. In the fifth O site, O(5) is bonded to two equivalent Ba(2), two equivalent Sr(2), one Ti(1), and one Ti(5) atom to form distorted OBa2Sr2Ti2 octahedra that share corners with two equivalent O(2)Ba2Sr2Ti2 octahedra, corners with two equivalent O(6)Ba2Sr2Ti2 octahedra, corners with two equivalent O(10)Ba4Ti2 octahedra,  an edgeedge with one O(2)Ba2Sr2Ti2 octahedra, edges with two equivalent O(5)Ba2Sr2Ti2 octahedra,  a faceface with one O(6)Ba2Sr2Ti2 octahedra, and  a faceface with one O(10)Ba4Ti2 octahedra. The corner-sharing octahedral tilt angles range from 0-61°. In the sixth O site, O(6) is bonded to two equivalent Ba(2), two equivalent Sr(1), one Ti(1), and one Ti(4) atom to form distorted OBa2Sr2Ti2 octahedra that share corners with two equivalent O(5)Ba2Sr2Ti2 octahedra, corners with two equivalent O(10)Ba4Ti2 octahedra,  an edgeedge with one O(10)Ba4Ti2 octahedra, edges with two equivalent O(6)Ba2Sr2Ti2 octahedra, and  a faceface with one O(5)Ba2Sr2Ti2 octahedra. The corner-sharing octahedral tilt angles range from 1-61°. In the seventh O site, O(7) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(2), one Ti(2), and one Ti(5) atom. In the eighth O site, O(8) is bonded in a distorted linear geometry to two equivalent Sr(2), two equivalent Ca(1), one Ti(1), and one Ti(3) atom. In the ninth O site, O(9) is bonded in a distorted linear geometry to two equivalent Ba(1), two equivalent Ca(1), one Ti(2), and one Ti(4) atom. In the tenth O site, O(10) is bonded to two equivalent Ba(1), two equivalent Ba(2), one Ti(3), and one Ti(5) atom to form distorted OBa4Ti2 octahedra that share corners with two equivalent O(2)Ba2Sr2Ti2 octahedra, corners with two equivalent O(5)Ba2Sr2Ti2 octahedra, corners with two equivalent O(6)Ba2Sr2Ti2 octahedra,  an edgeedge with one O(6)Ba2Sr2Ti2 octahedra, edges with two equivalent O(10)Ba4Ti2 octahedra,  a faceface with one O(2)Ba2Sr2Ti2 octahedra, and  a faceface with one O(5)Ba2Sr2Ti2 octahedra. The corner-sharing octahedral tilt angles range from 1-60°. In the eleventh O site, O(11) is bonded in a distorted linear geometry to one Ba(2), one Sr(1), one Sr(2), one Ca(1), and two equivalent Ti(1) atoms. In the twelfth O site, O(12) is bonded in a distorted linear geometry to one Ba(1), one Sr(1), one Sr(2), one Ca(1), and two equivalent Ti(2) atoms. In the thirteenth O site, O(13) is bonded in a distorted linear geometry to one Ba(1), one Ba(2), one Sr(2), one Ca(1), and two equivalent Ti(3) atoms. In the fourteenth O site, O(14) is bonded in a distorted linear geometry to one Ba(1), one Ba(2), one Sr(1), one Ca(1), and two equivalent Ti(4) atoms. In the fifteenth O site, O(15) is bonded in a distorted linear geometry to one Ba(1), one Ba(2), one Sr(1), one Sr(2), and two equivalent Ti(5) atoms.
Ba2Sr2CaTi5O15 is (Cubic) Perovskite-derived structured and crystallizes in the monoclinic Pm space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded to one O(12), one O(13), one O(14), one O(15), two equivalent O(10), two equivalent O(2), two equivalent O(4), and two equivalent O(9) atoms to form BaO12 cuboctahedra that share corners with three equivalent Ba(2)O12 cuboctahedra, corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Ca(1)O12 cuboctahedra,  a faceface with one Ba(2)O12 cuboctahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Ca(1)O12 cuboctahedra, faces with two equivalent Ba(1)O12 cuboctahedra, faces with two equivalent Ti(2)O6 octahedra, faces with two equivalent Ti(3)O6 octahedra, faces with two equivalent Ti(4)O6 octahedra, and faces with two equivalent Ti(5)O6 octahedra. The Ba(1)-O(12) bond length is 2.85 Å. The Ba(1)-O(13) bond length is 2.89 Å. The Ba(1)-O(14) bond length is 2.82 Å. The Ba(1)-O(15) bond length is 2.87 Å. Both Ba(1)-O(10) bond lengths are 2.82 Å. Both Ba(1)-O(2) bond lengths are 2.85 Å. Both Ba(1)-O(4) bond lengths are 2.85 Å. Both Ba(1)-O(9) bond lengths are 2.86 Å. In the second Ba site, Ba(2) is bonded to one O(11), one O(13), one O(14), one O(15), two equivalent O(10), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms to form BaO12 cuboctahedra that share corners with three equivalent Ba(1)O12 cuboctahedra, corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Ca(1)O12 cuboctahedra,  a faceface with one Ba(1)O12 cuboctahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Ca(1)O12 cuboctahedra, faces with two equivalent Ba(2)O12 cuboctahedra, faces with two equivalent Ti(1)O6 octahedra, faces with two equivalent Ti(3)O6 octahedra, faces with two equivalent Ti(4)O6 octahedra, and faces with two equivalent Ti(5)O6 octahedra. The Ba(2)-O(11) bond length is 2.89 Å. The Ba(2)-O(13) bond length is 2.87 Å. The Ba(2)-O(14) bond length is 2.81 Å. The Ba(2)-O(15) bond length is 2.86 Å. Both Ba(2)-O(10) bond lengths are 2.81 Å. Both Ba(2)-O(3) bond lengths are 2.87 Å. Both Ba(2)-O(5) bond lengths are 2.86 Å. Both Ba(2)-O(6) bond lengths are 2.84 Å. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(11), one O(12), one O(14), one O(15), two equivalent O(1), two equivalent O(4), two equivalent O(6), and two equivalent O(7) atoms to form SrO12 cuboctahedra that share corners with three equivalent Ba(1)O12 cuboctahedra, corners with three equivalent Ba(2)O12 cuboctahedra, corners with three equivalent Sr(2)O12 cuboctahedra, corners with three equivalent Ca(1)O12 cuboctahedra,  a faceface with one Ba(1)O12 cuboctahedra,  a faceface with one Ba(2)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra,  a faceface with one Ca(1)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Ti(1)O6 octahedra, faces with two equivalent Ti(2)O6 octahedra, faces with two equivalent Ti(4)O6 octahedra, and faces with two equivalent Ti(5)O6 octahedra. The Sr(1)-O(11) bond length is 2.80 Å. The Sr(1)-O(12) bond length is 2.75 Å. The Sr(1)-O(14) bond length is 2.84 Å. The Sr(1)-O(15) bond length is 2.77 Å. Both Sr(1)-O(1) bond lengths are 2.82 Å. Both Sr(1)-O(4) bond lengths are 2.78 Å. Both Sr(1)-O(6) bond lengths are 2.78 Å. Both Sr(1)-O(7) bond lengths are 2.80 Å. In the second Sr site, Sr(2) is bonded to one O(11), one O(12), one O(13), one O(15), two equivalent O(2), two equivalent O(5), two equivalent O(7), and two equivalent O(8) atoms to form SrO12 cuboctahedra that share corners with three equivalent Ba(1)O12 cuboctahedra, corners with three equivalent Ba(2)O12 cuboctahedra, corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Ca(1)O12 cuboctahedra,  a faceface with one Ba(1)O12 cuboctahedra,  a faceface with one Ba(2)O12 cuboctahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Ca(1)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, faces with two equivalent Ti(1)O6 octahedra, faces with two equivalent Ti(2)O6 octahedra, faces with two equivalent Ti(3)O6 octahedra, and faces with two equivalent Ti(5)O6 octahedra. The Sr(2)-O(11) bond length is 2.81 Å. The Sr(2)-O(12) bond length is 2.84 Å. The Sr(2)-O(13) bond length is 2.75 Å. The Sr(2)-O(15) bond length is 2.76 Å. Both Sr(2)-O(2) bond lengths are 2.76 Å. Both Sr(2)-O(5) bond lengths are 2.76 Å. Both Sr(2)-O(7) bond lengths are 2.82 Å. Both Sr(2)-O(8) bond lengths are 2.83 Å. Ca(1) is bonded to one O(11), one O(12), one O(13), one O(14), two equivalent O(1), two equivalent O(3), two equivalent O(8), and two equivalent O(9) atoms to form CaO12 cuboctahedra that share corners with three equivalent Ba(1)O12 cuboctahedra, corners with three equivalent Ba(2)O12 cuboctahedra, corners with three equivalent Sr(1)O12 cuboctahedra, corners with three equivalent Sr(2)O12 cuboctahedra,  a faceface with one Ba(1)O12 cuboctahedra,  a faceface with one Ba(2)O12 cuboctahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Sr(2)O12 cuboctahedra, faces with two equivalent Ca(1)O12 cuboctahedra, faces with two equivalent Ti(1)O6 octahedra, faces with two equivalent Ti(2)O6 octahedra, faces with two equivalent Ti(3)O6 octahedra, and faces with two equivalent Ti(4)O6 octahedra. The Ca(1)-O(11) bond length is 2.72 Å. The Ca(1)-O(12) bond length is 2.78 Å. The Ca(1)-O(13) bond length is 2.73 Å. The Ca(1)-O(14) bond length is 2.78 Å. Both Ca(1)-O(1) bond lengths are 2.79 Å. Both Ca(1)-O(3) bond lengths are 2.75 Å. Both Ca(1)-O(8) bond lengths are 2.78 Å. Both Ca(1)-O(9) bond lengths are 2.76 Å. There are five inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(1), one O(5), one O(6), one O(8), and two equivalent O(11) atoms to form TiO6 octahedra that share  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra, corners with two equivalent Ti(1)O6 octahedra, faces with two equivalent Ba(2)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, and faces with two equivalent Ca(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-2°. The Ti(1)-O(1) bond length is 1.95 Å. The Ti(1)-O(5) bond length is 2.02 Å. The Ti(1)-O(6) bond length is 2.01 Å. The Ti(1)-O(8) bond length is 1.95 Å. Both Ti(1)-O(11) bond lengths are 1.99 Å. In the second Ti site, Ti(2) is bonded to one O(1), one O(2), one O(7), one O(9), and two equivalent O(12) atoms to form TiO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra, corners with two equivalent Ti(2)O6 octahedra, faces with two equivalent Ba(1)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, and faces with two equivalent Ca(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-3°. The Ti(2)-O(1) bond length is 1.95 Å. The Ti(2)-O(2) bond length is 2.02 Å. The Ti(2)-O(7) bond length is 1.97 Å. The Ti(2)-O(9) bond length is 1.98 Å. Both Ti(2)-O(12) bond lengths are 1.99 Å. In the third Ti site, Ti(3) is bonded to one O(10), one O(2), one O(3), one O(8), and two equivalent O(13) atoms to form TiO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(4)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra, corners with two equivalent Ti(3)O6 octahedra, faces with two equivalent Ba(1)O12 cuboctahedra, faces with two equivalent Ba(2)O12 cuboctahedra, faces with two equivalent Sr(2)O12 cuboctahedra, and faces with two equivalent Ca(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-3°. The Ti(3)-O(10) bond length is 2.04 Å. The Ti(3)-O(2) bond length is 2.00 Å. The Ti(3)-O(3) bond length is 1.98 Å. The Ti(3)-O(8) bond length is 1.94 Å. Both Ti(3)-O(13) bond lengths are 1.99 Å. In the fourth Ti site, Ti(4) is bonded to one O(3), one O(4), one O(6), one O(9), and two equivalent O(14) atoms to form TiO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(5)O6 octahedra, corners with two equivalent Ti(4)O6 octahedra, faces with two equivalent Ba(1)O12 cuboctahedra, faces with two equivalent Ba(2)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with two equivalent Ca(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 1-3°. The Ti(4)-O(3) bond length is 1.97 Å. The Ti(4)-O(4) bond length is 2.00 Å. The Ti(4)-O(6) bond length is 2.01 Å. The Ti(4)-O(9) bond length is 1.98 Å. Both Ti(4)-O(14) bond lengths are 1.99 Å. In the fifth Ti site, Ti(5) is bonded to one O(10), one O(4), one O(5), one O(7), and two equivalent O(15) atoms to form TiO6 octahedra that share  a cornercorner with one Ti(1)O6 octahedra,  a cornercorner with one Ti(2)O6 octahedra,  a cornercorner with one Ti(3)O6 octahedra,  a cornercorner with one Ti(4)O6 octahedra, corners with two equivalent Ti(5)O6 octahedra, faces with two equivalent Ba(1)O12 cuboctahedra, faces with two equivalent Ba(2)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, and faces with two equivalent Sr(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-2°. The Ti(5)-O(10) bond length is 2.03 Å. The Ti(5)-O(4) bond length is 2.00 Å. The Ti(5)-O(5) bond length is 1.99 Å. The Ti(5)-O(7) bond length is 1.96 Å. Both Ti(5)-O(15) bond lengths are 1.99 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Ca(1), one Ti(1), and one Ti(2) atom. In the second O site, O(2) is bonded to two equivalent Ba(1), two equivalent Sr(2), one Ti(2), and one Ti(3) atom to form distorted OBa2Sr2Ti2 octahedra that share corners with two equivalent O(5)Ba2Sr2Ti2 octahedra, corners with two equivalent O(10)Ba4Ti2 octahedra,  an edgeedge with one O(5)Ba2Sr2Ti2 octahedra, edges with two equivalent O(2)Ba2Sr2Ti2 octahedra, and  a faceface with one O(10)Ba4Ti2 octahedra. The corner-sharing octahedral tilt angles range from 0-60°. In the third O site, O(3) is bonded in a distorted linear geometry to two equivalent Ba(2), two equivalent Ca(1), one Ti(3), and one Ti(4) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to two equivalent Ba(1), two equivalent Sr(1), one Ti(4), and one Ti(5) atom. In the fifth O site, O(5) is bonded to two equivalent Ba(2), two equivalent Sr(2), one Ti(1), and one Ti(5) atom to form distorted OBa2Sr2Ti2 octahedra that share corners with two equivalent O(2)Ba2Sr2Ti2 octahedra, corners with two equivalent O(6)Ba2Sr2Ti2 octahedra, corners with two equivalent O(10)Ba4Ti2 octahedra,  an edgeedge with one O(2)Ba2Sr2Ti2 octahedra, edges with two equivalent O(5)Ba2Sr2Ti2 octahedra,  a faceface with one O(6)Ba2Sr2Ti2 octahedra, and  a faceface with one O(10)Ba4Ti2 octahedra. The corner-sharing octahedral tilt angles range from 0-61°. In the sixth O site, O(6) is bonded to two equivalent Ba(2), two equivalent Sr(1), one Ti(1), and one Ti(4) atom to form distorted OBa2Sr2Ti2 octahedra that share corners with two equivalent O(5)Ba2Sr2Ti2 octahedra, corners with two equivalent O(10)Ba4Ti2 octahedra,  an edgeedge with one O(10)Ba4Ti2 octahedra, edges with two equivalent O(6)Ba2Sr2Ti2 octahedra, and  a faceface with one O(5)Ba2Sr2Ti2 octahedra. The corner-sharing octahedral tilt angles range from 1-61°. In the seventh O site, O(7) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(2), one Ti(2), and one Ti(5) atom. In the eighth O site, O(8) is bonded in a distorted linear geometry to two equivalent Sr(2), two equivalent Ca(1), one Ti(1), and one Ti(3) atom. In the ninth O site, O(9) is bonded in a distorted linear geometry to two equivalent Ba(1), two equivalent Ca(1), one Ti(2), and one Ti(4) atom. In the tenth O site, O(10) is bonded to two equivalent Ba(1), two equivalent Ba(2), one Ti(3), and one Ti(5) atom to form distorted OBa4Ti2 octahedra that share corners with two equivalent O(2)Ba2Sr2Ti2 octahedra, corners with two equivalent O(5)Ba2Sr2Ti2 octahedra, corners with two equivalent O(6)Ba2Sr2Ti2 octahedra,  an edgeedge with one O(6)Ba2Sr2Ti2 octahedra, edges with two equivalent O(10)Ba4Ti2 octahedra,  a faceface with one O(2)Ba2Sr2Ti2 octahedra, and  a faceface with one O(5)Ba2Sr2Ti2 octahedra. The corner-sharing octahedral tilt angles range from 1-60°. In the eleventh O site, O(11) is bonded in a distorted linear geometry to one Ba(2), one Sr(1), one Sr(2), one Ca(1), and two equivalent Ti(1) atoms. In the twelfth O site, O(12) is bonded in a distorted linear geometry to one Ba(1), one Sr(1), one Sr(2), one Ca(1), and two equivalent Ti(2) atoms. In the thirteenth O site, O(13) is bonded in a distorted linear geometry to one Ba(1), one Ba(2), one Sr(2), one Ca(1), and two equivalent Ti(3) atoms. In the fourteenth O site, O(14) is bonded in a distorted linear geometry to one Ba(1), one Ba(2), one Sr(1), one Ca(1), and two equivalent Ti(4) atoms. In the fifteenth O site, O(15) is bonded in a distorted linear geometry to one Ba(1), one Ba(2), one Sr(1), one Sr(2), and two equivalent Ti(5) atoms.