Cd3(PO4)2 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. In the second Cd site, Cd(2) is bonded in a 6-coordinate geometry to one O(2), one O(4), two equivalent O(3), 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(1), one O(2), and two equivalent O(5) atoms. In the second P site, P(2) is bonded in a tetrahedral geometry to two equivalent O(3) and two equivalent O(4) atoms. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Cd(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Cd(2) and one P(1) atom. In the third O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Cd(2) and one P(1) atom. In the fourth O site, O(3) is bonded in a 4-coordinate geometry to one Cd(1), two equivalent Cd(2), and one P(2) atom. In the fifth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cd(1), one Cd(2), and one P(2) atom.
Cd3(PO4)2 crystallizes in the orthorhombic Cmce space group. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. Both Cd(1)-O(1) bond lengths are 2.26 Å. Both Cd(1)-O(3) bond lengths are 2.58 Å. Both Cd(1)-O(4) bond lengths are 2.30 Å. In the second Cd site, Cd(2) is bonded in a 6-coordinate geometry to one O(2), one O(4), two equivalent O(3), and two equivalent O(5) atoms. The Cd(2)-O(2) bond length is 2.36 Å. The Cd(2)-O(4) bond length is 2.27 Å. There is one shorter (2.25 Å) and one longer (2.53 Å) Cd(2)-O(3) bond length. There is one shorter (2.18 Å) and one longer (2.38 Å) Cd(2)-O(5) bond length. 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(5) atoms. The P(1)-O(1) bond length is 1.56 Å. The P(1)-O(2) bond length is 1.52 Å. Both P(1)-O(5) bond lengths are 1.55 Å. In the second P site, P(2) is bonded in a tetrahedral geometry to two equivalent O(3) and two equivalent O(4) atoms. Both P(2)-O(3) bond lengths are 1.55 Å. Both P(2)-O(4) bond lengths are 1.54 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Cd(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Cd(2) and one P(1) atom. In the third O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Cd(2) and one P(1) atom. In the fourth O site, O(3) is bonded in a 4-coordinate geometry to one Cd(1), two equivalent Cd(2), and one P(2) atom. In the fifth O site, O(4) is bonded in a distorted trigonal planar geometry to one Cd(1), one Cd(2), and one P(2) atom.