Sr4BiP3O13 crystallizes in the monoclinic P2_1/m space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(9), two equivalent O(4), and two equivalent O(5) atoms. In the third Sr site, Sr(3) is bonded to one O(10), one O(2), one O(7), two equivalent O(5), and two equivalent O(6) atoms to form distorted SrO7 pentagonal bipyramids that share  a cornercorner with one P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  an edgeedge with one P(3)O4 tetrahedra. Bi(1) is bonded in a 6-coordinate geometry to one O(10), one O(3), two equivalent O(4), and two equivalent O(6) atoms. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(7), and two equivalent O(4) atoms to form PO4 tetrahedra that share  a cornercorner with one Sr(3)O7 pentagonal bipyramid. In the second P site, P(2) is bonded to one O(2), one O(8), and two equivalent O(5) atoms to form PO4 tetrahedra that share corners with three equivalent Sr(3)O7 pentagonal bipyramids. In the third P site, P(3) is bonded to one O(3), one O(9), and two equivalent O(6) atoms to form PO4 tetrahedra that share  an edgeedge with one Sr(3)O7 pentagonal bipyramid. There are ten inequivalent O sites. In the first O site, O(7) is bonded in a distorted single-bond geometry to one Sr(3), two equivalent Sr(1), and one P(1) atom. In the second O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one P(2) atom. In the third O site, O(9) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one P(3) atom. In the fourth O site, O(10) is bonded in a trigonal planar geometry to one Sr(2), one Sr(3), and one Bi(1) atom. In the fifth O site, O(1) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one P(1) atom. In the sixth O site, O(2) is bonded in a distorted tetrahedral geometry to one Sr(3), two equivalent Sr(1), and one P(2) atom. In the seventh O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Sr(1), one Bi(1), and one P(3) atom. In the eighth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), one Bi(1), and one P(1) atom. In the ninth O site, O(5) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), and one P(2) atom. In the tenth O site, O(6) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), one Bi(1), and one P(3) atom.
Sr4BiP3O13 crystallizes in the monoclinic P2_1/m space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. The Sr(1)-O(1) bond length is 2.65 Å. The Sr(1)-O(2) bond length is 2.57 Å. The Sr(1)-O(3) bond length is 2.56 Å. The Sr(1)-O(4) bond length is 3.03 Å. The Sr(1)-O(5) bond length is 2.91 Å. The Sr(1)-O(6) bond length is 2.93 Å. The Sr(1)-O(7) bond length is 2.62 Å. The Sr(1)-O(8) bond length is 2.54 Å. The Sr(1)-O(9) bond length is 2.59 Å. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(9), two equivalent O(4), and two equivalent O(5) atoms. The Sr(2)-O(1) bond length is 2.63 Å. The Sr(2)-O(10) bond length is 2.45 Å. The Sr(2)-O(9) bond length is 2.89 Å. Both Sr(2)-O(4) bond lengths are 2.62 Å. Both Sr(2)-O(5) bond lengths are 2.63 Å. In the third Sr site, Sr(3) is bonded to one O(10), one O(2), one O(7), two equivalent O(5), and two equivalent O(6) atoms to form distorted SrO7 pentagonal bipyramids that share  a cornercorner with one P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  an edgeedge with one P(3)O4 tetrahedra. The Sr(3)-O(10) bond length is 2.45 Å. The Sr(3)-O(2) bond length is 2.52 Å. The Sr(3)-O(7) bond length is 2.84 Å. Both Sr(3)-O(5) bond lengths are 2.57 Å. Both Sr(3)-O(6) bond lengths are 2.67 Å. Bi(1) is bonded in a 6-coordinate geometry to one O(10), one O(3), two equivalent O(4), and two equivalent O(6) atoms. The Bi(1)-O(10) bond length is 2.06 Å. The Bi(1)-O(3) bond length is 2.73 Å. Both Bi(1)-O(4) bond lengths are 2.45 Å. Both Bi(1)-O(6) bond lengths are 2.61 Å. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(7), and two equivalent O(4) atoms to form PO4 tetrahedra that share  a cornercorner with one Sr(3)O7 pentagonal bipyramid. The P(1)-O(1) bond length is 1.55 Å. The P(1)-O(7) bond length is 1.54 Å. Both P(1)-O(4) bond lengths are 1.58 Å. In the second P site, P(2) is bonded to one O(2), one O(8), and two equivalent O(5) atoms to form PO4 tetrahedra that share corners with three equivalent Sr(3)O7 pentagonal bipyramids. The P(2)-O(2) bond length is 1.56 Å. The P(2)-O(8) bond length is 1.56 Å. Both P(2)-O(5) bond lengths are 1.55 Å. In the third P site, P(3) is bonded to one O(3), one O(9), and two equivalent O(6) atoms to form PO4 tetrahedra that share  an edgeedge with one Sr(3)O7 pentagonal bipyramid. The P(3)-O(3) bond length is 1.56 Å. The P(3)-O(9) bond length is 1.55 Å. Both P(3)-O(6) bond lengths are 1.57 Å. There are ten inequivalent O sites. In the first O site, O(7) is bonded in a distorted single-bond geometry to one Sr(3), two equivalent Sr(1), and one P(1) atom. In the second O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one P(2) atom. In the third O site, O(9) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one P(3) atom. In the fourth O site, O(10) is bonded in a trigonal planar geometry to one Sr(2), one Sr(3), and one Bi(1) atom. In the fifth O site, O(1) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one P(1) atom. In the sixth O site, O(2) is bonded in a distorted tetrahedral geometry to one Sr(3), two equivalent Sr(1), and one P(2) atom. In the seventh O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Sr(1), one Bi(1), and one P(3) atom. In the eighth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), one Bi(1), and one P(1) atom. In the ninth O site, O(5) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), and one P(2) atom. In the tenth O site, O(6) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), one Bi(1), and one P(3) atom.