KSr4(BO3)3 crystallizes in the orthorhombic Ama2 space group. K(1) is bonded in a 8-coordinate geometry to one O(1), one O(5), two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(6), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(6), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(1), one O(5), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. There are three inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(5) and two equivalent O(4) atoms. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1) and two equivalent O(2) atoms. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(6) and two equivalent O(3) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one Sr(3), two equivalent Sr(1), and one B(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one Sr(2), one Sr(3), two equivalent Sr(1), and one B(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), two equivalent Sr(1), and one B(3) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one K(1), one Sr(2), one Sr(3), two equivalent Sr(1), and one B(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(1), one Sr(3), two equivalent Sr(2), and one B(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent K(1), one Sr(2), two equivalent Sr(1), and one B(3) atom.
KSr4(BO3)3 crystallizes in the orthorhombic Ama2 space group. K(1) is bonded in a 8-coordinate geometry to one O(1), one O(5), two equivalent O(2), two equivalent O(4), and two equivalent O(6) atoms. The K(1)-O(1) bond length is 2.90 Å. The K(1)-O(5) bond length is 3.02 Å. Both K(1)-O(2) bond lengths are 3.12 Å. Both K(1)-O(4) bond lengths are 2.87 Å. Both K(1)-O(6) bond lengths are 3.02 Å. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(6), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. The Sr(1)-O(1) bond length is 2.58 Å. The Sr(1)-O(6) bond length is 2.63 Å. There is one shorter (2.53 Å) and one longer (2.62 Å) Sr(1)-O(2) bond length. There is one shorter (2.62 Å) and one longer (2.69 Å) Sr(1)-O(3) bond length. There is one shorter (2.58 Å) and one longer (2.66 Å) Sr(1)-O(4) bond length. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(6), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. The Sr(2)-O(6) bond length is 2.59 Å. Both Sr(2)-O(2) bond lengths are 2.77 Å. Both Sr(2)-O(3) bond lengths are 2.60 Å. Both Sr(2)-O(4) bond lengths are 2.66 Å. Both Sr(2)-O(5) bond lengths are 2.97 Å. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(1), one O(5), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. The Sr(3)-O(1) bond length is 2.68 Å. The Sr(3)-O(5) bond length is 2.58 Å. Both Sr(3)-O(2) bond lengths are 2.58 Å. Both Sr(3)-O(3) bond lengths are 2.58 Å. Both Sr(3)-O(4) bond lengths are 2.72 Å. There are three inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(5) and two equivalent O(4) atoms. The B(1)-O(5) bond length is 1.37 Å. Both B(1)-O(4) bond lengths are 1.42 Å. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(1) and two equivalent O(2) atoms. The B(2)-O(1) bond length is 1.38 Å. Both B(2)-O(2) bond lengths are 1.41 Å. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(6) and two equivalent O(3) atoms. The B(3)-O(6) bond length is 1.38 Å. Both B(3)-O(3) bond lengths are 1.40 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one Sr(3), two equivalent Sr(1), and one B(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one Sr(2), one Sr(3), two equivalent Sr(1), and one B(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), two equivalent Sr(1), and one B(3) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one K(1), one Sr(2), one Sr(3), two equivalent Sr(1), and one B(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(1), one Sr(3), two equivalent Sr(2), and one B(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent K(1), one Sr(2), two equivalent Sr(1), and one B(3) atom.