SrBi4Ti4O15 crystallizes in the orthorhombic Cmc2_1 space group. Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(6), and four equivalent O(4) atoms. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(5), one O(6), two equivalent O(2), and two equivalent O(4) atoms to form corner-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 14-28°. In the second Ti site, Ti(2) is bonded in a 6-coordinate geometry to one O(1), one O(5), two equivalent O(7), and two equivalent O(8) atoms. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to one O(2), one O(7), two equivalent O(5), and two equivalent O(8) atoms. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(3) atoms. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ti(2) and two equivalent Bi(2) atoms. In the second O site, O(7) is bonded in a distorted T-shaped geometry to two equivalent Ti(2) and one Bi(1) atom. In the third O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Ti(1), and one Bi(1) atom. In the fourth O site, O(3) is bonded to four equivalent Bi(2) atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. In the fifth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(1) and two equivalent Ti(1) atoms. In the sixth O site, O(5) is bonded in a distorted see-saw-like geometry to one Ti(1), one Ti(2), and two equivalent Bi(1) atoms. In the seventh O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Ti(1) atoms. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to two equivalent Ti(2) and two equivalent Bi(1) atoms.
SrBi4Ti4O15 crystallizes in the orthorhombic Cmc2_1 space group. Sr(1) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(6), and four equivalent O(4) atoms. Both Sr(1)-O(2) bond lengths are 2.69 Å. There is one shorter (2.53 Å) and one longer (2.56 Å) Sr(1)-O(6) bond length. There are two shorter (2.57 Å) and two longer (2.66 Å) Sr(1)-O(4) bond lengths. There are two inequivalent Ti sites. In the first Ti site, Ti(1) is bonded to one O(5), one O(6), two equivalent O(2), and two equivalent O(4) atoms to form corner-sharing TiO6 octahedra. The corner-sharing octahedral tilt angles range from 14-28°. The Ti(1)-O(5) bond length is 2.01 Å. The Ti(1)-O(6) bond length is 2.00 Å. There is one shorter (1.87 Å) and one longer (2.14 Å) Ti(1)-O(2) bond length. There is one shorter (1.83 Å) and one longer (2.12 Å) Ti(1)-O(4) bond length. In the second Ti site, Ti(2) is bonded in a 6-coordinate geometry to one O(1), one O(5), two equivalent O(7), and two equivalent O(8) atoms. The Ti(2)-O(1) bond length is 1.78 Å. The Ti(2)-O(5) bond length is 2.37 Å. There is one shorter (1.91 Å) and one longer (2.07 Å) Ti(2)-O(7) bond length. There is one shorter (1.96 Å) and one longer (2.11 Å) Ti(2)-O(8) bond length. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to one O(2), one O(7), two equivalent O(5), and two equivalent O(8) atoms. The Bi(1)-O(2) bond length is 2.46 Å. The Bi(1)-O(7) bond length is 2.36 Å. There is one shorter (2.26 Å) and one longer (2.46 Å) Bi(1)-O(5) bond length. There is one shorter (2.34 Å) and one longer (2.63 Å) Bi(1)-O(8) bond length. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(3) atoms. There is one shorter (2.48 Å) and one longer (2.70 Å) Bi(2)-O(1) bond length. There are a spread of Bi(2)-O(3) bond distances ranging from 2.23-2.48 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ti(2) and two equivalent Bi(2) atoms. In the second O site, O(7) is bonded in a distorted T-shaped geometry to two equivalent Ti(2) and one Bi(1) atom. In the third O site, O(2) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Ti(1), and one Bi(1) atom. In the fourth O site, O(3) is bonded to four equivalent Bi(2) atoms to form a mixture of edge and corner-sharing OBi4 tetrahedra. In the fifth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sr(1) and two equivalent Ti(1) atoms. In the sixth O site, O(5) is bonded in a distorted see-saw-like geometry to one Ti(1), one Ti(2), and two equivalent Bi(1) atoms. In the seventh O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Ti(1) atoms. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to two equivalent Ti(2) and two equivalent Bi(1) atoms.