K3Tm(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 10-coordinate geometry to one O(6), two equivalent O(3), three equivalent O(5), and four equivalent O(4) atoms. In the second K site, K(2) is bonded in a 11-coordinate geometry to one O(1), one O(6), two equivalent O(4), three equivalent O(2), and four equivalent O(3) atoms. In the third K site, K(3) is bonded in a 9-coordinate geometry to one O(2), one O(5), two equivalent O(3), two equivalent O(4), and three equivalent O(6) atoms. Tm(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(5), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(1), one O(2), and two equivalent O(3) atoms. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(5), one O(6), and two equivalent O(4) atoms. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one K(2), one Tm(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(3), three equivalent K(2), one Tm(1), and one P(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one K(1), one K(3), two equivalent K(2), one Tm(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one K(2), one K(3), two equivalent K(1), one Tm(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one K(3), three equivalent K(1), one Tm(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(1), one K(2), three equivalent K(3), and one P(2) atom.
K3Tm(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 10-coordinate geometry to one O(6), two equivalent O(3), three equivalent O(5), and four equivalent O(4) atoms. The K(1)-O(6) bond length is 2.71 Å. Both K(1)-O(3) bond lengths are 2.75 Å. There are two shorter (2.84 Å) and one longer (3.10 Å) K(1)-O(5) bond length. There are two shorter (2.82 Å) and two longer (3.05 Å) K(1)-O(4) bond lengths. In the second K site, K(2) is bonded in a 11-coordinate geometry to one O(1), one O(6), two equivalent O(4), three equivalent O(2), and four equivalent O(3) atoms. The K(2)-O(1) bond length is 2.62 Å. The K(2)-O(6) bond length is 2.94 Å. Both K(2)-O(4) bond lengths are 3.10 Å. There are two shorter (2.88 Å) and one longer (3.03 Å) K(2)-O(2) bond length. There are two shorter (2.95 Å) and two longer (3.33 Å) K(2)-O(3) bond lengths. In the third K site, K(3) is bonded in a 9-coordinate geometry to one O(2), one O(5), two equivalent O(3), two equivalent O(4), and three equivalent O(6) atoms. The K(3)-O(2) bond length is 2.66 Å. The K(3)-O(5) bond length is 2.73 Å. Both K(3)-O(3) bond lengths are 2.91 Å. Both K(3)-O(4) bond lengths are 3.04 Å. There is one shorter (2.81 Å) and two longer (2.99 Å) K(3)-O(6) bond lengths. Tm(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(5), two equivalent O(3), and two equivalent O(4) atoms. The Tm(1)-O(1) bond length is 2.32 Å. The Tm(1)-O(2) bond length is 2.58 Å. The Tm(1)-O(5) bond length is 2.40 Å. Both Tm(1)-O(3) bond lengths are 2.33 Å. Both Tm(1)-O(4) bond lengths are 2.23 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(1), one O(2), and two equivalent O(3) atoms. The P(1)-O(1) bond length is 1.55 Å. The P(1)-O(2) bond length is 1.56 Å. Both P(1)-O(3) bond lengths are 1.56 Å. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(5), one O(6), and two equivalent O(4) atoms. The P(2)-O(5) bond length is 1.56 Å. The P(2)-O(6) bond length is 1.54 Å. Both P(2)-O(4) bond lengths are 1.57 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one K(2), one Tm(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(3), three equivalent K(2), one Tm(1), and one P(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one K(1), one K(3), two equivalent K(2), one Tm(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one K(2), one K(3), two equivalent K(1), one Tm(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a 1-coordinate geometry to one K(3), three equivalent K(1), one Tm(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(1), one K(2), three equivalent K(3), and one P(2) atom.