MgNi crystallizes in the trigonal R-3m space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted hexagonal planar geometry to six equivalent Mg(2) and six equivalent Ni(1) atoms. In the second Mg site, Mg(2) is bonded in a 16-coordinate geometry to three equivalent Mg(1), four equivalent Mg(2), and nine equivalent Ni(1) atoms. Ni(1) is bonded to two equivalent Mg(1), six equivalent Mg(2), and four equivalent Ni(1) atoms to form a mixture of distorted edge, face, and corner-sharing NiMg8Ni4 cuboctahedra.
MgNi crystallizes in the trigonal R-3m space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted hexagonal planar geometry to six equivalent Mg(2) and six equivalent Ni(1) atoms. All Mg(1)-Mg(2) bond lengths are 2.92 Å. All Mg(1)-Ni(1) bond lengths are 2.46 Å. In the second Mg site, Mg(2) is bonded in a 16-coordinate geometry to three equivalent Mg(1), four equivalent Mg(2), and nine equivalent Ni(1) atoms. There is one shorter (2.87 Å) and three longer (3.08 Å) Mg(2)-Mg(2) bond lengths. There are six shorter (2.87 Å) and three longer (2.94 Å) Mg(2)-Ni(1) bond lengths. Ni(1) is bonded to two equivalent Mg(1), six equivalent Mg(2), and four equivalent Ni(1) atoms to form a mixture of distorted edge, face, and corner-sharing NiMg8Ni4 cuboctahedra. All Ni(1)-Ni(1) bond lengths are 2.48 Å.