Ni5Sb2 crystallizes in the monoclinic C2/m space group. There are six inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), two equivalent Ni(4), two equivalent Sb(1), and two equivalent Sb(2) atoms to form a mixture of distorted edge, corner, and face-sharing NiNi8Sb4 cuboctahedra. In the second Ni site, Ni(2) is bonded in a 11-coordinate geometry to two Ni(1,1); four Ni(4,4); two equivalent Sb(2); and three equivalent Sb(1) atoms. In the third Ni site, Ni(3) is bonded in a 10-coordinate geometry to two Ni(1,1); four Ni(4,4); two equivalent Sb(1); and two equivalent Sb(2) atoms. In the fourth Ni site, Ni(4) is bonded to one Ni(1); two equivalent Ni(2); two equivalent Ni(3); three Ni(4,4); two equivalent Sb(1); and two equivalent Sb(2) atoms to form a mixture of distorted edge, corner, and face-sharing NiNi8Sb4 cuboctahedra. In the fifth Ni site, Ni(4) is bonded to one Ni(1), two equivalent Ni(2), two equivalent Ni(3), three equivalent Ni(4), two equivalent Sb(1), and two equivalent Sb(2) atoms to form a mixture of distorted edge, corner, and face-sharing NiNi8Sb4 cuboctahedra. In the sixth Ni site, Ni(1) is bonded to two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), two equivalent Ni(4), two equivalent Sb(1), and two equivalent Sb(2) atoms to form a mixture of distorted edge, corner, and face-sharing NiNi8Sb4 cuboctahedra. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 11-coordinate geometry to two Ni(1,1); two equivalent Ni(3); three equivalent Ni(2); and four Ni(4,4) atoms. In the second Sb site, Sb(2) is bonded in a 10-coordinate geometry to two Ni(1,1); two equivalent Ni(2); two equivalent Ni(3); and four Ni(4,4) atoms.
Ni5Sb2 crystallizes in the monoclinic C2/m space group. There are six inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), two equivalent Ni(4), two equivalent Sb(1), and two equivalent Sb(2) atoms to form a mixture of distorted edge, corner, and face-sharing NiNi8Sb4 cuboctahedra. There is one shorter (2.69 Å) and one longer (2.71 Å) Ni(1)-Ni(1) bond length. Both Ni(1)-Ni(2) bond lengths are 2.60 Å. Both Ni(1)-Ni(3) bond lengths are 2.56 Å. Both Ni(1)-Ni(4) bond lengths are 2.62 Å. Both Ni(1)-Sb(1) bond lengths are 2.58 Å. Both Ni(1)-Sb(2) bond lengths are 2.55 Å. In the second Ni site, Ni(2) is bonded in a 11-coordinate geometry to two Ni(1,1); four Ni(4,4); two equivalent Sb(2); and three equivalent Sb(1) atoms. The Ni(2)-Ni(1) bond length is 2.60 Å. There are two shorter (2.58 Å) and two longer (2.59 Å) Ni(2)-Ni(4,4) bond lengths. There is one shorter (2.60 Å) and one longer (2.63 Å) Ni(2)-Sb(2) bond length. There are two shorter (2.70 Å) and one longer (2.81 Å) Ni(2)-Sb(1) bond length. In the third Ni site, Ni(3) is bonded in a 10-coordinate geometry to two Ni(1,1); four Ni(4,4); two equivalent Sb(1); and two equivalent Sb(2) atoms. The Ni(3)-Ni(1) bond length is 2.56 Å. There are two shorter (2.55 Å) and two longer (2.57 Å) Ni(3)-Ni(4,4) bond lengths. There is one shorter (2.58 Å) and one longer (2.61 Å) Ni(3)-Sb(1) bond length. Both Ni(3)-Sb(2) bond lengths are 2.70 Å. In the fourth Ni site, Ni(4) is bonded to one Ni(1); two equivalent Ni(2); two equivalent Ni(3); three Ni(4,4); two equivalent Sb(1); and two equivalent Sb(2) atoms to form a mixture of distorted edge, corner, and face-sharing NiNi8Sb4 cuboctahedra. The Ni(4)-Ni(1) bond length is 2.62 Å. There are a spread of Ni(4)-Ni(4,4) bond distances ranging from 2.69-2.73 Å. There is one shorter (2.58 Å) and one longer (2.61 Å) Ni(4)-Sb(1) bond length. There is one shorter (2.55 Å) and one longer (2.56 Å) Ni(4)-Sb(2) bond length. In the fifth Ni site, Ni(4) is bonded to one Ni(1), two equivalent Ni(2), two equivalent Ni(3), three equivalent Ni(4), two equivalent Sb(1), and two equivalent Sb(2) atoms to form a mixture of distorted edge, corner, and face-sharing NiNi8Sb4 cuboctahedra. The Ni(4)-Ni(1) bond length is 2.62 Å. There is one shorter (2.58 Å) and one longer (2.61 Å) Ni(4)-Sb(1) bond length. There is one shorter (2.55 Å) and one longer (2.56 Å) Ni(4)-Sb(2) bond length. In the sixth Ni site, Ni(1) is bonded to two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), two equivalent Ni(4), two equivalent Sb(1), and two equivalent Sb(2) atoms to form a mixture of distorted edge, corner, and face-sharing NiNi8Sb4 cuboctahedra. There is one shorter (2.69 Å) and one longer (2.71 Å) Ni(1)-Ni(1) bond length. Both Ni(1)-Sb(1) bond lengths are 2.58 Å. Both Ni(1)-Sb(2) bond lengths are 2.55 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 11-coordinate geometry to two Ni(1,1); two equivalent Ni(3); three equivalent Ni(2); and four Ni(4,4) atoms. In the second Sb site, Sb(2) is bonded in a 10-coordinate geometry to two Ni(1,1); two equivalent Ni(2); two equivalent Ni(3); and four Ni(4,4) atoms.