SrNi2P2 crystallizes in the orthorhombic Immm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 16-coordinate geometry to two equivalent Ni(2), six equivalent Ni(1), four equivalent P(1), and four equivalent P(2) atoms. In the second Sr site, Sr(2) is bonded in a 12-coordinate geometry to four equivalent Ni(1) and eight equivalent P(1) atoms. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one Sr(2), three equivalent Sr(1), one P(2), and three equivalent P(1) atoms to form distorted NiSr4P4 tetrahedra that share corners with three equivalent Ni(2)Sr2P4 tetrahedra, corners with seven equivalent Ni(1)Sr4P4 tetrahedra,  an edgeedge with one Ni(2)Sr2P4 tetrahedra, edges with five equivalent Ni(1)Sr4P4 tetrahedra, faces with two equivalent Ni(2)Sr2P4 tetrahedra, and faces with two equivalent Ni(1)Sr4P4 tetrahedra. In the second Ni site, Ni(2) is bonded to two equivalent Sr(1), two equivalent P(1), and two equivalent P(2) atoms to form distorted NiSr2P4 tetrahedra that share corners with two equivalent Ni(2)Sr2P4 tetrahedra, corners with six equivalent Ni(1)Sr4P4 tetrahedra,  an edgeedge with one Ni(2)Sr2P4 tetrahedra, edges with two equivalent Ni(1)Sr4P4 tetrahedra, and faces with four equivalent Ni(1)Sr4P4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded in a 8-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Ni(2), and three equivalent Ni(1) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to four equivalent Sr(1), two equivalent Ni(1), two equivalent Ni(2), and one P(2) atom.
SrNi2P2 crystallizes in the orthorhombic Immm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 16-coordinate geometry to two equivalent Ni(2), six equivalent Ni(1), four equivalent P(1), and four equivalent P(2) atoms. Both Sr(1)-Ni(2) bond lengths are 3.25 Å. There are four shorter (3.22 Å) and two longer (3.38 Å) Sr(1)-Ni(1) bond lengths. All Sr(1)-P(1) bond lengths are 3.16 Å. All Sr(1)-P(2) bond lengths are 3.19 Å. In the second Sr site, Sr(2) is bonded in a 12-coordinate geometry to four equivalent Ni(1) and eight equivalent P(1) atoms. All Sr(2)-Ni(1) bond lengths are 3.35 Å. All Sr(2)-P(1) bond lengths are 3.26 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one Sr(2), three equivalent Sr(1), one P(2), and three equivalent P(1) atoms to form distorted NiSr4P4 tetrahedra that share corners with three equivalent Ni(2)Sr2P4 tetrahedra, corners with seven equivalent Ni(1)Sr4P4 tetrahedra,  an edgeedge with one Ni(2)Sr2P4 tetrahedra, edges with five equivalent Ni(1)Sr4P4 tetrahedra, faces with two equivalent Ni(2)Sr2P4 tetrahedra, and faces with two equivalent Ni(1)Sr4P4 tetrahedra. The Ni(1)-P(2) bond length is 2.22 Å. There are two shorter (2.22 Å) and one longer (2.27 Å) Ni(1)-P(1) bond length. In the second Ni site, Ni(2) is bonded to two equivalent Sr(1), two equivalent P(1), and two equivalent P(2) atoms to form distorted NiSr2P4 tetrahedra that share corners with two equivalent Ni(2)Sr2P4 tetrahedra, corners with six equivalent Ni(1)Sr4P4 tetrahedra,  an edgeedge with one Ni(2)Sr2P4 tetrahedra, edges with two equivalent Ni(1)Sr4P4 tetrahedra, and faces with four equivalent Ni(1)Sr4P4 tetrahedra. Both Ni(2)-P(1) bond lengths are 2.26 Å. Both Ni(2)-P(2) bond lengths are 2.27 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded in a 8-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one Ni(2), and three equivalent Ni(1) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to four equivalent Sr(1), two equivalent Ni(1), two equivalent Ni(2), and one P(2) atom. The P(2)-P(2) bond length is 2.49 Å.