KU2(PO4)3 crystallizes in the monoclinic Cc space group. K(1) is bonded in a 9-coordinate geometry to one O(10), one O(3), one O(4), one O(5), one O(6), two equivalent O(11), and two equivalent O(12) atoms. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 9-coordinate geometry to one O(11), one O(5), one O(7), one O(8), one O(9), two equivalent O(1), and two equivalent O(3) atoms. In the second U site, U(2) is bonded in a 9-coordinate geometry to one O(10), one O(12), one O(6), one O(7), one O(8), two equivalent O(2), and two equivalent O(4) atoms. There are three inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(11), one O(12), one O(3), and one O(4) atom. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(1), one O(10), one O(6), and one O(7) atom. In the third P site, P(3) is bonded in a tetrahedral geometry to one O(2), one O(5), one O(8), and one O(9) atom. There are twelve inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one K(1), one U(1), and one P(3) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one K(1), one U(2), and one P(2) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to one U(1), one U(2), and one P(2) atom. In the fourth O site, O(8) is bonded in a distorted single-bond geometry to one U(1), one U(2), and one P(3) atom. In the fifth O site, O(9) is bonded in a bent 150 degrees geometry to one U(1) and one P(3) atom. In the sixth O site, O(10) is bonded in a 2-coordinate geometry to one K(1), one U(2), and one P(2) atom. In the seventh O site, O(11) is bonded in a distorted single-bond geometry to two equivalent K(1), one U(1), and one P(1) atom. In the eighth O site, O(12) is bonded in a distorted single-bond geometry to two equivalent K(1), one U(2), and one P(1) atom. In the ninth O site, O(1) is bonded in a distorted single-bond geometry to two equivalent U(1) and one P(2) atom. In the tenth O site, O(2) is bonded in a distorted single-bond geometry to two equivalent U(2) and one P(3) atom. In the eleventh O site, O(3) is bonded in a distorted single-bond geometry to one K(1), two equivalent U(1), and one P(1) atom. In the twelfth O site, O(4) is bonded in a distorted single-bond geometry to one K(1), two equivalent U(2), and one P(1) atom.
KU2(PO4)3 crystallizes in the monoclinic Cc space group. K(1) is bonded in a 9-coordinate geometry to one O(10), one O(3), one O(4), one O(5), one O(6), two equivalent O(11), and two equivalent O(12) atoms. The K(1)-O(10) bond length is 3.22 Å. The K(1)-O(3) bond length is 2.87 Å. The K(1)-O(4) bond length is 2.81 Å. The K(1)-O(5) bond length is 2.78 Å. The K(1)-O(6) bond length is 2.79 Å. There is one shorter (2.90 Å) and one longer (3.05 Å) K(1)-O(11) bond length. There is one shorter (2.78 Å) and one longer (3.36 Å) K(1)-O(12) bond length. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 9-coordinate geometry to one O(11), one O(5), one O(7), one O(8), one O(9), two equivalent O(1), and two equivalent O(3) atoms. The U(1)-O(11) bond length is 2.41 Å. The U(1)-O(5) bond length is 2.34 Å. The U(1)-O(7) bond length is 2.51 Å. The U(1)-O(8) bond length is 2.44 Å. The U(1)-O(9) bond length is 2.29 Å. There is one shorter (2.45 Å) and one longer (2.47 Å) U(1)-O(1) bond length. There is one shorter (2.47 Å) and one longer (2.64 Å) U(1)-O(3) bond length. In the second U site, U(2) is bonded in a 9-coordinate geometry to one O(10), one O(12), one O(6), one O(7), one O(8), two equivalent O(2), and two equivalent O(4) atoms. The U(2)-O(10) bond length is 2.31 Å. The U(2)-O(12) bond length is 2.41 Å. The U(2)-O(6) bond length is 2.34 Å. The U(2)-O(7) bond length is 2.44 Å. The U(2)-O(8) bond length is 2.49 Å. There is one shorter (2.44 Å) and one longer (2.47 Å) U(2)-O(2) bond length. There is one shorter (2.47 Å) and one longer (2.64 Å) U(2)-O(4) bond length. There are three inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(11), one O(12), one O(3), and one O(4) atom. The P(1)-O(11) bond length is 1.55 Å. The P(1)-O(12) bond length is 1.55 Å. The P(1)-O(3) bond length is 1.56 Å. The P(1)-O(4) bond length is 1.56 Å. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(1), one O(10), one O(6), and one O(7) atom. The P(2)-O(1) bond length is 1.56 Å. The P(2)-O(10) bond length is 1.54 Å. The P(2)-O(6) bond length is 1.54 Å. The P(2)-O(7) bond length is 1.57 Å. In the third P site, P(3) is bonded in a tetrahedral geometry to one O(2), one O(5), one O(8), and one O(9) atom. The P(3)-O(2) bond length is 1.56 Å. The P(3)-O(5) bond length is 1.54 Å. The P(3)-O(8) bond length is 1.57 Å. The P(3)-O(9) bond length is 1.54 Å. There are twelve inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one K(1), one U(1), and one P(3) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one K(1), one U(2), and one P(2) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to one U(1), one U(2), and one P(2) atom. In the fourth O site, O(8) is bonded in a distorted single-bond geometry to one U(1), one U(2), and one P(3) atom. In the fifth O site, O(9) is bonded in a bent 150 degrees geometry to one U(1) and one P(3) atom. In the sixth O site, O(10) is bonded in a 2-coordinate geometry to one K(1), one U(2), and one P(2) atom. In the seventh O site, O(11) is bonded in a distorted single-bond geometry to two equivalent K(1), one U(1), and one P(1) atom. In the eighth O site, O(12) is bonded in a distorted single-bond geometry to two equivalent K(1), one U(2), and one P(1) atom. In the ninth O site, O(1) is bonded in a distorted single-bond geometry to two equivalent U(1) and one P(2) atom. In the tenth O site, O(2) is bonded in a distorted single-bond geometry to two equivalent U(2) and one P(3) atom. In the eleventh O site, O(3) is bonded in a distorted single-bond geometry to one K(1), two equivalent U(1), and one P(1) atom. In the twelfth O site, O(4) is bonded in a distorted single-bond geometry to one K(1), two equivalent U(2), and one P(1) atom.