MgNiPO5 crystallizes in the monoclinic Cc space group. Mg(1) is bonded in a 7-coordinate geometry to one O(3), one O(4), one O(5), two equivalent O(1), and two equivalent O(2) atoms. Ni(1) is bonded to one O(1), one O(2), one O(3), one O(4), and two equivalent O(5) atoms to form NiO6 octahedra that share corners with two equivalent Ni(1)O6 octahedra and corners with four equivalent P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with four equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-56°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Mg(1), one Ni(1), and one P(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Mg(1), one Ni(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Ni(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mg(1), one Ni(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent Ni(1) atoms.
MgNiPO5 crystallizes in the monoclinic Cc space group. Mg(1) is bonded in a 7-coordinate geometry to one O(3), one O(4), one O(5), two equivalent O(1), and two equivalent O(2) atoms. The Mg(1)-O(3) bond length is 2.15 Å. The Mg(1)-O(4) bond length is 2.22 Å. The Mg(1)-O(5) bond length is 1.96 Å. There is one shorter (2.32 Å) and one longer (2.63 Å) Mg(1)-O(1) bond length. There is one shorter (2.43 Å) and one longer (2.45 Å) Mg(1)-O(2) bond length. Ni(1) is bonded to one O(1), one O(2), one O(3), one O(4), and two equivalent O(5) atoms to form NiO6 octahedra that share corners with two equivalent Ni(1)O6 octahedra and corners with four equivalent P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. The Ni(1)-O(1) bond length is 2.10 Å. The Ni(1)-O(2) bond length is 2.09 Å. The Ni(1)-O(3) bond length is 2.05 Å. The Ni(1)-O(4) bond length is 2.02 Å. There is one shorter (1.84 Å) and one longer (1.88 Å) Ni(1)-O(5) bond length. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with four equivalent Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-56°. 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 1.53 Å. The P(1)-O(4) bond length is 1.56 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent Mg(1), one Ni(1), and one P(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent Mg(1), one Ni(1), and one P(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Ni(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mg(1), one Ni(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent Ni(1) atoms.