Ce2Ni7P4 crystallizes in the orthorhombic Pmn2_1 space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 16-coordinate geometry to one Ni(3), one Ni(5), two equivalent Ni(2), two equivalent Ni(6), two equivalent Ni(7), three equivalent Ni(1), two equivalent P(4), and three equivalent P(1) atoms. In the second Ce site, Ce(2) is bonded in a 17-coordinate geometry to one Ni(2), one Ni(5), one Ni(6), two equivalent Ni(7), three equivalent Ni(3), three equivalent Ni(4), two equivalent P(2), two equivalent P(3), and two equivalent P(4) atoms. There are seven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Ce(1), one P(2), and two equivalent P(1) atoms. In the second Ni site, Ni(2) is bonded in a 3-coordinate geometry to one Ce(2), two equivalent Ce(1), one P(1), and two equivalent P(3) atoms. In the third Ni site, Ni(3) is bonded to one Ce(1), three equivalent Ce(2), one P(2), one P(3), and two equivalent P(4) atoms to form a mixture of distorted corner and edge-sharing NiCe4P4 tetrahedra. In the fourth Ni site, Ni(4) is bonded in a 4-coordinate geometry to three equivalent Ce(2), one P(2), one P(4), and two equivalent P(3) atoms. In the fifth Ni site, Ni(5) is bonded in a 3-coordinate geometry to one Ce(1), one Ce(2), one P(3), and two equivalent P(2) atoms. In the sixth Ni site, Ni(6) is bonded in a 4-coordinate geometry to one Ce(2), two equivalent Ce(1), one P(1), one P(4), and two equivalent P(2) atoms. In the seventh Ni site, Ni(7) is bonded in a 4-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), one P(3), one P(4), and two equivalent P(1) atoms. There are four inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to three equivalent Ce(1), one Ni(2), one Ni(6), two equivalent Ni(1), and two equivalent Ni(7) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Ce(2), one Ni(1), one Ni(3), one Ni(4), two equivalent Ni(5), and two equivalent Ni(6) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to two equivalent Ce(2), one Ni(3), one Ni(5), one Ni(7), two equivalent Ni(2), and two equivalent Ni(4) atoms. In the fourth P site, P(4) is bonded in a 9-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), one Ni(4), one Ni(6), one Ni(7), and two equivalent Ni(3) atoms.
Ce2Ni7P4 crystallizes in the orthorhombic Pmn2_1 space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 16-coordinate geometry to one Ni(3), one Ni(5), two equivalent Ni(2), two equivalent Ni(6), two equivalent Ni(7), three equivalent Ni(1), two equivalent P(4), and three equivalent P(1) atoms. The Ce(1)-Ni(3) bond length is 3.21 Å. The Ce(1)-Ni(5) bond length is 2.99 Å. Both Ce(1)-Ni(2) bond lengths are 3.07 Å. Both Ce(1)-Ni(6) bond lengths are 2.95 Å. Both Ce(1)-Ni(7) bond lengths are 3.28 Å. There are two shorter (3.02 Å) and one longer (3.20 Å) Ce(1)-Ni(1) bond length. Both Ce(1)-P(4) bond lengths are 2.98 Å. There is one shorter (2.94 Å) and two longer (3.04 Å) Ce(1)-P(1) bond lengths. In the second Ce site, Ce(2) is bonded in a 17-coordinate geometry to one Ni(2), one Ni(5), one Ni(6), two equivalent Ni(7), three equivalent Ni(3), three equivalent Ni(4), two equivalent P(2), two equivalent P(3), and two equivalent P(4) atoms. The Ce(2)-Ni(2) bond length is 3.15 Å. The Ce(2)-Ni(5) bond length is 3.14 Å. The Ce(2)-Ni(6) bond length is 3.29 Å. Both Ce(2)-Ni(7) bond lengths are 3.00 Å. There is one shorter (3.12 Å) and two longer (3.15 Å) Ce(2)-Ni(3) bond lengths. There are two shorter (2.98 Å) and one longer (3.14 Å) Ce(2)-Ni(4) bond length. Both Ce(2)-P(2) bond lengths are 2.91 Å. Both Ce(2)-P(3) bond lengths are 2.86 Å. Both Ce(2)-P(4) bond lengths are 2.95 Å. There are seven inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Ce(1), one P(2), and two equivalent P(1) atoms. The Ni(1)-P(2) bond length is 2.18 Å. Both Ni(1)-P(1) bond lengths are 2.31 Å. In the second Ni site, Ni(2) is bonded in a 3-coordinate geometry to one Ce(2), two equivalent Ce(1), one P(1), and two equivalent P(3) atoms. The Ni(2)-P(1) bond length is 2.19 Å. Both Ni(2)-P(3) bond lengths are 2.35 Å. In the third Ni site, Ni(3) is bonded to one Ce(1), three equivalent Ce(2), one P(2), one P(3), and two equivalent P(4) atoms to form a mixture of distorted corner and edge-sharing NiCe4P4 tetrahedra. The Ni(3)-P(2) bond length is 2.26 Å. The Ni(3)-P(3) bond length is 2.33 Å. Both Ni(3)-P(4) bond lengths are 2.36 Å. In the fourth Ni site, Ni(4) is bonded in a 4-coordinate geometry to three equivalent Ce(2), one P(2), one P(4), and two equivalent P(3) atoms. The Ni(4)-P(2) bond length is 2.29 Å. The Ni(4)-P(4) bond length is 2.27 Å. Both Ni(4)-P(3) bond lengths are 2.38 Å. In the fifth Ni site, Ni(5) is bonded in a 3-coordinate geometry to one Ce(1), one Ce(2), one P(3), and two equivalent P(2) atoms. The Ni(5)-P(3) bond length is 2.16 Å. Both Ni(5)-P(2) bond lengths are 2.33 Å. In the sixth Ni site, Ni(6) is bonded in a 4-coordinate geometry to one Ce(2), two equivalent Ce(1), one P(1), one P(4), and two equivalent P(2) atoms. The Ni(6)-P(1) bond length is 2.33 Å. The Ni(6)-P(4) bond length is 2.24 Å. Both Ni(6)-P(2) bond lengths are 2.39 Å. In the seventh Ni site, Ni(7) is bonded in a 4-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), one P(3), one P(4), and two equivalent P(1) atoms. The Ni(7)-P(3) bond length is 2.34 Å. The Ni(7)-P(4) bond length is 2.38 Å. Both Ni(7)-P(1) bond lengths are 2.43 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to three equivalent Ce(1), one Ni(2), one Ni(6), two equivalent Ni(1), and two equivalent Ni(7) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Ce(2), one Ni(1), one Ni(3), one Ni(4), two equivalent Ni(5), and two equivalent Ni(6) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to two equivalent Ce(2), one Ni(3), one Ni(5), one Ni(7), two equivalent Ni(2), and two equivalent Ni(4) atoms. In the fourth P site, P(4) is bonded in a 9-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), one Ni(4), one Ni(6), one Ni(7), and two equivalent Ni(3) atoms.