KPO4 crystallizes in the monoclinic P2_1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(13), one O(3), one O(5), one O(6), one O(7), and one O(8) atom. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(16), one O(3), one O(4), one O(6), and one O(7) atom. In the third K site, K(3) is bonded in a 8-coordinate geometry to one O(11), one O(12), one O(13), one O(14), one O(15), one O(2), one O(5), and one O(6) atom. In the fourth K site, K(4) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(12), one O(14), one O(15), one O(4), one O(8), and one O(9) atom. There are four inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(5), one O(6), one O(7), and one O(8) atom. In the third P site, P(3) is bonded in a tetrahedral geometry to one O(10), one O(11), one O(12), and one O(9) atom. In the fourth P site, P(4) is bonded in a tetrahedral geometry to one O(13), one O(14), one O(15), and one O(16) atom. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(3) and one P(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(1), one K(2), 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 K(4), and one P(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one K(1), one K(3), 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), one K(3), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1), one K(4), and one P(2) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one K(4) and one P(3) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one K(1), one K(4), and one P(3) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one K(3), one K(4), and one P(3) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one K(2), one K(3), one K(4), and one P(3) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one K(1), one K(3), and one P(4) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one K(3), one K(4), and one P(4) atom. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to one K(3), one K(4), and one P(4) atom. In the sixteenth O site, O(16) is bonded in a distorted single-bond geometry to one K(2) and one P(4) atom.
KPO4 crystallizes in the monoclinic P2_1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(13), one O(3), one O(5), one O(6), one O(7), and one O(8) atom. The K(1)-O(1) bond length is 2.81 Å. The K(1)-O(10) bond length is 2.81 Å. The K(1)-O(13) bond length is 2.77 Å. The K(1)-O(3) bond length is 2.89 Å. The K(1)-O(5) bond length is 3.07 Å. The K(1)-O(6) bond length is 3.00 Å. The K(1)-O(7) bond length is 3.25 Å. The K(1)-O(8) bond length is 3.07 Å. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(1), one O(12), one O(16), one O(3), one O(4), one O(6), and one O(7) atom. The K(2)-O(1) bond length is 2.99 Å. The K(2)-O(12) bond length is 2.98 Å. The K(2)-O(16) bond length is 2.86 Å. The K(2)-O(3) bond length is 3.00 Å. The K(2)-O(4) bond length is 2.85 Å. The K(2)-O(6) bond length is 2.85 Å. The K(2)-O(7) bond length is 2.86 Å. In the third K site, K(3) is bonded in a 8-coordinate geometry to one O(11), one O(12), one O(13), one O(14), one O(15), one O(2), one O(5), and one O(6) atom. The K(3)-O(11) bond length is 2.84 Å. The K(3)-O(12) bond length is 2.84 Å. The K(3)-O(13) bond length is 2.86 Å. The K(3)-O(14) bond length is 2.96 Å. The K(3)-O(15) bond length is 3.10 Å. The K(3)-O(2) bond length is 2.83 Å. The K(3)-O(5) bond length is 3.06 Å. The K(3)-O(6) bond length is 2.96 Å. In the fourth K site, K(4) is bonded in a 8-coordinate geometry to one O(10), one O(11), one O(12), one O(14), one O(15), one O(4), one O(8), and one O(9) atom. The K(4)-O(10) bond length is 3.25 Å. The K(4)-O(11) bond length is 3.03 Å. The K(4)-O(12) bond length is 3.09 Å. The K(4)-O(14) bond length is 2.88 Å. The K(4)-O(15) bond length is 2.82 Å. The K(4)-O(4) bond length is 2.86 Å. The K(4)-O(8) bond length is 2.86 Å. The K(4)-O(9) bond length is 2.97 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The P(1)-O(1) bond length is 1.54 Å. The P(1)-O(2) bond length is 1.55 Å. The P(1)-O(3) bond length is 1.55 Å. The P(1)-O(4) bond length is 1.53 Å. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(5), one O(6), one O(7), and one O(8) atom. The P(2)-O(5) bond length is 1.55 Å. The P(2)-O(6) bond length is 1.53 Å. The P(2)-O(7) bond length is 1.55 Å. The P(2)-O(8) bond length is 1.55 Å. In the third P site, P(3) is bonded in a tetrahedral geometry to one O(10), one O(11), one O(12), and one O(9) atom. The P(3)-O(10) bond length is 1.55 Å. The P(3)-O(11) bond length is 1.55 Å. The P(3)-O(12) bond length is 1.54 Å. The P(3)-O(9) bond length is 1.55 Å. In the fourth P site, P(4) is bonded in a tetrahedral geometry to one O(13), one O(14), one O(15), and one O(16) atom. The P(4)-O(13) bond length is 1.54 Å. The P(4)-O(14) bond length is 1.54 Å. The P(4)-O(15) bond length is 1.55 Å. The P(4)-O(16) bond length is 1.54 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(3) and one P(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(1), one K(2), 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 K(4), and one P(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one K(1), one K(3), 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), one K(3), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(1), one K(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1), one K(4), and one P(2) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one K(4) and one P(3) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one K(1), one K(4), and one P(3) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one K(3), one K(4), and one P(3) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one K(2), one K(3), one K(4), and one P(3) atom. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one K(1), one K(3), and one P(4) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one K(3), one K(4), and one P(4) atom. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to one K(3), one K(4), and one P(4) atom. In the sixteenth O site, O(16) is bonded in a distorted single-bond geometry to one K(2) and one P(4) atom.