Mg3Bi2 crystallizes in the cubic Ia-3 space group. Mg(1) is bonded to one Bi(1) and three equivalent Bi(2) atoms to form a mixture of edge and corner-sharing MgBi4 tetrahedra. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to six equivalent Mg(1) atoms. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to six equivalent Mg(1) atoms.
Mg3Bi2 crystallizes in the cubic Ia-3 space group. Mg(1) is bonded to one Bi(1) and three equivalent Bi(2) atoms to form a mixture of edge and corner-sharing MgBi4 tetrahedra. The Mg(1)-Bi(1) bond length is 2.93 Å. There are a spread of Mg(1)-Bi(2) bond distances ranging from 2.89-2.98 Å. There are two inequivalent Bi sites. In the first Bi site, Bi(1) is bonded in a 6-coordinate geometry to six equivalent Mg(1) atoms. In the second Bi site, Bi(2) is bonded in a 6-coordinate geometry to six equivalent Mg(1) atoms.