K3Sm(PO4)2 crystallizes in the monoclinic P2_1/m space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one O(3), one O(6), two equivalent O(2), two equivalent O(5), and three equivalent O(1) atoms. In the second K site, K(2) is bonded in a 11-coordinate geometry to one O(1), one O(4), two equivalent O(2), three equivalent O(3), and four equivalent O(5) atoms. In the third K site, K(3) is bonded in a 10-coordinate geometry to one O(1), two equivalent O(5), three equivalent O(6), and four equivalent O(2) atoms. Sm(1) is bonded in a 7-coordinate geometry to one O(3), one O(4), one O(6), two equivalent O(2), and two equivalent O(5) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(3), one O(4), and two equivalent O(5) atoms. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(1), one O(6), and two equivalent O(2) 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(2), one K(3), three equivalent K(1), and one P(2) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one K(1), one K(2), two equivalent K(3), one Sm(1), and one P(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), one Sm(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one K(2), one Sm(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one K(1), one K(3), two equivalent K(2), one Sm(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(3), one Sm(1), and one P(2) atom.
K3Sm(PO4)2 crystallizes in the monoclinic P2_1/m space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one O(3), one O(6), two equivalent O(2), two equivalent O(5), and three equivalent O(1) atoms. The K(1)-O(3) bond length is 2.70 Å. The K(1)-O(6) bond length is 2.69 Å. Both K(1)-O(2) bond lengths are 2.97 Å. Both K(1)-O(5) bond lengths are 2.87 Å. There is one shorter (2.81 Å) and two longer (2.97 Å) K(1)-O(1) bond lengths. In the second K site, K(2) is bonded in a 11-coordinate geometry to one O(1), one O(4), two equivalent O(2), three equivalent O(3), and four equivalent O(5) atoms. The K(2)-O(1) bond length is 2.95 Å. The K(2)-O(4) bond length is 2.63 Å. Both K(2)-O(2) bond lengths are 3.10 Å. There are two shorter (2.88 Å) and one longer (3.07 Å) K(2)-O(3) bond length. There are two shorter (2.94 Å) and two longer (3.18 Å) K(2)-O(5) bond lengths. In the third K site, K(3) is bonded in a 10-coordinate geometry to one O(1), two equivalent O(5), three equivalent O(6), and four equivalent O(2) atoms. The K(3)-O(1) bond length is 2.67 Å. Both K(3)-O(5) bond lengths are 2.79 Å. There are two shorter (2.82 Å) and one longer (3.13 Å) K(3)-O(6) bond length. There are two shorter (2.80 Å) and two longer (3.02 Å) K(3)-O(2) bond lengths. Sm(1) is bonded in a 7-coordinate geometry to one O(3), one O(4), one O(6), two equivalent O(2), and two equivalent O(5) atoms. The Sm(1)-O(3) bond length is 2.51 Å. The Sm(1)-O(4) bond length is 2.45 Å. The Sm(1)-O(6) bond length is 2.46 Å. Both Sm(1)-O(2) bond lengths are 2.31 Å. Both Sm(1)-O(5) bond lengths are 2.42 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(3), one O(4), and two equivalent O(5) atoms. The P(1)-O(3) bond length is 1.55 Å. The P(1)-O(4) bond length is 1.54 Å. Both P(1)-O(5) bond lengths are 1.54 Å. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(1), one O(6), and two equivalent O(2) atoms. The P(2)-O(1) bond length is 1.52 Å. The P(2)-O(6) bond length is 1.54 Å. Both P(2)-O(2) bond lengths are 1.55 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(2), one K(3), three equivalent K(1), and one P(2) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one K(1), one K(2), two equivalent K(3), one Sm(1), and one P(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(2), one Sm(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one K(2), one Sm(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one K(1), one K(3), two equivalent K(2), one Sm(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(1), three equivalent K(3), one Sm(1), and one P(2) atom.