SrBi2Ta2O9 crystallizes in the orthorhombic Cmc2_1 space group. Sr(1) is bonded in a 12-coordinate geometry to four equivalent O(1), four equivalent O(2), and four equivalent O(4) atoms. Ta(1) is bonded to one O(4), one O(5), two equivalent O(1), and two equivalent O(2) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 11-23°. Bi(1) is bonded in a 6-coordinate geometry to two equivalent O(5) and four equivalent O(3) atoms. There are five inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to one Ta(1) and two equivalent Bi(1) atoms. In the second O site, O(1) is bonded in a distorted linear geometry to two equivalent Sr(1) and two equivalent Ta(1) atoms. In the third O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Ta(1) atoms. In the fourth O site, O(3) is bonded to four equivalent Bi(1) atoms to form a mixture of corner and edge-sharing OBi4 tetrahedra. In the fifth O site, O(4) is bonded in a 6-coordinate geometry to four equivalent Sr(1) and two equivalent Ta(1) atoms.
SrBi2Ta2O9 crystallizes in the orthorhombic Cmc2_1 space group. Sr(1) is bonded in a 12-coordinate geometry to four equivalent O(1), four equivalent O(2), and four equivalent O(4) atoms. There are two shorter (2.75 Å) and two longer (3.02 Å) Sr(1)-O(1) bond lengths. There are two shorter (2.57 Å) and two longer (2.61 Å) Sr(1)-O(2) bond lengths. There are a spread of Sr(1)-O(4) bond distances ranging from 2.52-3.02 Å. Ta(1) is bonded to one O(4), one O(5), two equivalent O(1), and two equivalent O(2) atoms to form corner-sharing TaO6 octahedra. The corner-sharing octahedral tilt angles range from 11-23°. The Ta(1)-O(4) bond length is 2.12 Å. The Ta(1)-O(5) bond length is 1.88 Å. There is one shorter (1.93 Å) and one longer (2.02 Å) Ta(1)-O(1) bond length. There is one shorter (1.94 Å) and one longer (2.04 Å) Ta(1)-O(2) bond length. Bi(1) is bonded in a 6-coordinate geometry to two equivalent O(5) and four equivalent O(3) atoms. There is one shorter (2.46 Å) and one longer (2.53 Å) Bi(1)-O(5) bond length. There are a spread of Bi(1)-O(3) bond distances ranging from 2.19-2.57 Å. There are five inequivalent O sites. In the first O site, O(5) is bonded in a distorted single-bond geometry to one Ta(1) and two equivalent Bi(1) atoms. In the second O site, O(1) is bonded in a distorted linear geometry to two equivalent Sr(1) and two equivalent Ta(1) atoms. In the third O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Ta(1) atoms. In the fourth O site, O(3) is bonded to four equivalent Bi(1) atoms to form a mixture of corner and edge-sharing OBi4 tetrahedra. In the fifth O site, O(4) is bonded in a 6-coordinate geometry to four equivalent Sr(1) and two equivalent Ta(1) atoms.