SrNi2(PO4)2 crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 1-coordinate geometry to one O(2), one O(3), one O(4), and two equivalent O(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(5), one O(6), and one O(7) atom. In the second Ni site, Ni(2) is bonded in a 4-coordinate geometry to one O(5), one O(6), one O(7), and one O(8) atom. There are two inequivalent P sites. In the first P site, P(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(3), one O(4), and one O(6) atom. In the second P site, P(2) is bonded in a 4-coordinate geometry to one O(2), one O(5), 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 4-coordinate geometry to two equivalent Sr(1), one Ni(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted water-like geometry to one Sr(1) and one P(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), one Ni(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Sr(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Ni(1), one Ni(2), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ni(1), one Ni(2), and one P(1) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one Ni(1), one Ni(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Ni(2) and one P(2) atom.
SrNi2(PO4)2 crystallizes in the triclinic P-1 space group. Sr(1) is bonded in a 1-coordinate geometry to one O(2), one O(3), one O(4), and two equivalent O(1) atoms. The Sr(1)-O(2) bond length is 2.58 Å. The Sr(1)-O(3) bond length is 2.46 Å. The Sr(1)-O(4) bond length is 1.73 Å. There is one shorter (2.45 Å) and one longer (3.19 Å) Sr(1)-O(1) bond length. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(5), one O(6), and one O(7) atom. The Ni(1)-O(1) bond length is 2.45 Å. The Ni(1)-O(3) bond length is 2.21 Å. The Ni(1)-O(5) bond length is 2.29 Å. The Ni(1)-O(6) bond length is 2.21 Å. The Ni(1)-O(7) bond length is 2.45 Å. In the second Ni site, Ni(2) is bonded in a 4-coordinate geometry to one O(5), one O(6), one O(7), and one O(8) atom. The Ni(2)-O(5) bond length is 1.81 Å. The Ni(2)-O(6) bond length is 1.67 Å. The Ni(2)-O(7) bond length is 2.21 Å. The Ni(2)-O(8) bond length is 1.88 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(3), one O(4), and one O(6) atom. The P(1)-O(1) bond length is 2.07 Å. The P(1)-O(3) bond length is 1.63 Å. The P(1)-O(4) bond length is 1.50 Å. The P(1)-O(6) bond length is 1.55 Å. In the second P site, P(2) is bonded in a 4-coordinate geometry to one O(2), one O(5), one O(7), and one O(8) atom. The P(2)-O(2) bond length is 2.22 Å. The P(2)-O(5) bond length is 1.57 Å. The P(2)-O(7) bond length is 1.21 Å. The P(2)-O(8) bond length is 1.76 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Ni(1), and one P(1) atom. In the second O site, O(2) is bonded in a distorted water-like geometry to one Sr(1) and one P(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Sr(1), one Ni(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Sr(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Ni(1), one Ni(2), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Ni(1), one Ni(2), and one P(1) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one Ni(1), one Ni(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Ni(2) and one P(2) atom.