Ce2Ni12As7 crystallizes in the hexagonal P-6 space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 18-coordinate geometry to three equivalent Ni(1), three equivalent Ni(2), six equivalent Ni(3), and six equivalent As(2) atoms. In the second Ce site, Ce(2) is bonded in a 15-coordinate geometry to three equivalent Ni(3), six equivalent Ni(1), and six equivalent As(1) atoms. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one Ce(1), two equivalent Ce(2), two equivalent As(1), and two equivalent As(2) atoms to form distorted NiCe3As4 tetrahedra that share corners with four equivalent Ni(3)Ce3As4 tetrahedra, corners with four equivalent Ni(2)CeAs4 tetrahedra, corners with six equivalent Ni(1)Ce3As4 tetrahedra,  an edgeedge with one Ni(2)CeAs4 tetrahedra, edges with two equivalent Ni(1)Ce3As4 tetrahedra, edges with four equivalent Ni(3)Ce3As4 tetrahedra,  a faceface with one Ni(2)CeAs4 tetrahedra, faces with two equivalent Ni(1)Ce3As4 tetrahedra, and faces with two equivalent Ni(3)Ce3As4 tetrahedra. In the second Ni site, Ni(2) is bonded to one Ce(1), one As(1), one As(3), and two equivalent As(2) atoms to form distorted NiCeAs4 tetrahedra that share corners with two equivalent Ni(3)Ce3As4 tetrahedra, corners with four equivalent Ni(1)Ce3As4 tetrahedra, corners with six equivalent Ni(2)CeAs4 tetrahedra,  an edgeedge with one Ni(1)Ce3As4 tetrahedra, edges with two equivalent Ni(3)Ce3As4 tetrahedra,  a faceface with one Ni(1)Ce3As4 tetrahedra, and faces with two equivalent Ni(3)Ce3As4 tetrahedra. In the third Ni site, Ni(3) is bonded to one Ce(2), two equivalent Ce(1), two equivalent As(1), and two equivalent As(2) atoms to form distorted NiCe3As4 tetrahedra that share corners with two equivalent Ni(2)CeAs4 tetrahedra, corners with four equivalent Ni(1)Ce3As4 tetrahedra, corners with six equivalent Ni(3)Ce3As4 tetrahedra, edges with two equivalent Ni(3)Ce3As4 tetrahedra, edges with two equivalent Ni(2)CeAs4 tetrahedra, edges with four equivalent Ni(1)Ce3As4 tetrahedra, faces with two equivalent Ni(1)Ce3As4 tetrahedra, faces with two equivalent Ni(3)Ce3As4 tetrahedra, and faces with two equivalent Ni(2)CeAs4 tetrahedra. In the fourth Ni site, Ni(4) is bonded in a 5-coordinate geometry to one As(2), two equivalent As(1), and two equivalent As(3) atoms. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 9-coordinate geometry to two equivalent Ce(2), one Ni(2), two equivalent Ni(1), two equivalent Ni(3), and two equivalent Ni(4) atoms. In the second As site, As(2) is bonded in a 9-coordinate geometry to two equivalent Ce(1), one Ni(4), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(3) atoms. In the third As site, As(3) is bonded in a 9-coordinate geometry to three equivalent Ni(2) and six equivalent Ni(4) atoms.
Ce2Ni12As7 crystallizes in the hexagonal P-6 space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 18-coordinate geometry to three equivalent Ni(1), three equivalent Ni(2), six equivalent Ni(3), and six equivalent As(2) atoms. All Ce(1)-Ni(1) bond lengths are 3.25 Å. All Ce(1)-Ni(2) bond lengths are 3.17 Å. All Ce(1)-Ni(3) bond lengths are 3.19 Å. All Ce(1)-As(2) bond lengths are 3.04 Å. In the second Ce site, Ce(2) is bonded in a 15-coordinate geometry to three equivalent Ni(3), six equivalent Ni(1), and six equivalent As(1) atoms. All Ce(2)-Ni(3) bond lengths are 3.21 Å. All Ce(2)-Ni(1) bond lengths are 3.13 Å. All Ce(2)-As(1) bond lengths are 3.02 Å. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one Ce(1), two equivalent Ce(2), two equivalent As(1), and two equivalent As(2) atoms to form distorted NiCe3As4 tetrahedra that share corners with four equivalent Ni(3)Ce3As4 tetrahedra, corners with four equivalent Ni(2)CeAs4 tetrahedra, corners with six equivalent Ni(1)Ce3As4 tetrahedra,  an edgeedge with one Ni(2)CeAs4 tetrahedra, edges with two equivalent Ni(1)Ce3As4 tetrahedra, edges with four equivalent Ni(3)Ce3As4 tetrahedra,  a faceface with one Ni(2)CeAs4 tetrahedra, faces with two equivalent Ni(1)Ce3As4 tetrahedra, and faces with two equivalent Ni(3)Ce3As4 tetrahedra. There is one shorter (2.38 Å) and one longer (2.39 Å) Ni(1)-As(1) bond length. Both Ni(1)-As(2) bond lengths are 2.41 Å. In the second Ni site, Ni(2) is bonded to one Ce(1), one As(1), one As(3), and two equivalent As(2) atoms to form distorted NiCeAs4 tetrahedra that share corners with two equivalent Ni(3)Ce3As4 tetrahedra, corners with four equivalent Ni(1)Ce3As4 tetrahedra, corners with six equivalent Ni(2)CeAs4 tetrahedra,  an edgeedge with one Ni(1)Ce3As4 tetrahedra, edges with two equivalent Ni(3)Ce3As4 tetrahedra,  a faceface with one Ni(1)Ce3As4 tetrahedra, and faces with two equivalent Ni(3)Ce3As4 tetrahedra. The Ni(2)-As(1) bond length is 2.31 Å. The Ni(2)-As(3) bond length is 2.26 Å. Both Ni(2)-As(2) bond lengths are 2.41 Å. In the third Ni site, Ni(3) is bonded to one Ce(2), two equivalent Ce(1), two equivalent As(1), and two equivalent As(2) atoms to form distorted NiCe3As4 tetrahedra that share corners with two equivalent Ni(2)CeAs4 tetrahedra, corners with four equivalent Ni(1)Ce3As4 tetrahedra, corners with six equivalent Ni(3)Ce3As4 tetrahedra, edges with two equivalent Ni(3)Ce3As4 tetrahedra, edges with two equivalent Ni(2)CeAs4 tetrahedra, edges with four equivalent Ni(1)Ce3As4 tetrahedra, faces with two equivalent Ni(1)Ce3As4 tetrahedra, faces with two equivalent Ni(3)Ce3As4 tetrahedra, and faces with two equivalent Ni(2)CeAs4 tetrahedra. Both Ni(3)-As(1) bond lengths are 2.40 Å. There is one shorter (2.40 Å) and one longer (2.47 Å) Ni(3)-As(2) bond length. In the fourth Ni site, Ni(4) is bonded in a 5-coordinate geometry to one As(2), two equivalent As(1), and two equivalent As(3) atoms. The Ni(4)-As(2) bond length is 2.40 Å. Both Ni(4)-As(1) bond lengths are 2.65 Å. Both Ni(4)-As(3) bond lengths are 2.60 Å. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 9-coordinate geometry to two equivalent Ce(2), one Ni(2), two equivalent Ni(1), two equivalent Ni(3), and two equivalent Ni(4) atoms. In the second As site, As(2) is bonded in a 9-coordinate geometry to two equivalent Ce(1), one Ni(4), two equivalent Ni(1), two equivalent Ni(2), and two equivalent Ni(3) atoms. In the third As site, As(3) is bonded in a 9-coordinate geometry to three equivalent Ni(2) and six equivalent Ni(4) atoms.