RbPO4 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one O(4), one O(5), one O(7), two equivalent O(3), and two equivalent O(6) atoms. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to one O(1), one O(4), one O(7), two equivalent O(2), and two equivalent O(8) 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), 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. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Rb(2) and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Rb(2) and one P(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), and one P(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Rb(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent Rb(2) and one P(2) atom.
RbPO4 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one O(4), one O(5), one O(7), two equivalent O(3), and two equivalent O(6) atoms. The Rb(1)-O(4) bond length is 3.09 Å. The Rb(1)-O(5) bond length is 3.16 Å. The Rb(1)-O(7) bond length is 3.06 Å. There is one shorter (3.02 Å) and one longer (3.03 Å) Rb(1)-O(3) bond length. There is one shorter (3.00 Å) and one longer (3.15 Å) Rb(1)-O(6) bond length. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to one O(1), one O(4), one O(7), two equivalent O(2), and two equivalent O(8) atoms. The Rb(2)-O(1) bond length is 3.12 Å. The Rb(2)-O(4) bond length is 3.11 Å. The Rb(2)-O(7) bond length is 3.13 Å. There is one shorter (2.99 Å) and one longer (3.24 Å) Rb(2)-O(2) bond length. Both Rb(2)-O(8) bond lengths are 3.05 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), one O(3), and one O(4) atom. The P(1)-O(1) bond length is 1.56 Å. The P(1)-O(2) bond length is 1.55 Å. The P(1)-O(3) bond length is 1.54 Å. The P(1)-O(4) bond length is 1.54 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 1.56 Å. The P(2)-O(6) bond length is 1.55 Å. The P(2)-O(7) bond length is 1.54 Å. The P(2)-O(8) bond length is 1.54 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Rb(2) and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Rb(2) and one P(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), and one P(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Rb(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Rb(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent Rb(2) and one P(2) atom.