K3(Mg10In7)2 crystallizes in the cubic Pm-3m space group. K(1) is bonded in a 20-coordinate geometry to four equivalent Mg(1), eight equivalent Mg(2), and eight equivalent In(2) atoms. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 5-coordinate geometry to one K(1), one In(3), and four equivalent In(2) atoms. In the second Mg site, Mg(2) is bonded to three equivalent K(1), one In(1), and three equivalent In(2) atoms to form a mixture of face, corner, and edge-sharing MgK3In4 tetrahedra. There are three inequivalent In sites. In the first In site, In(3) is bonded in a cuboctahedral geometry to twelve equivalent Mg(1) atoms. In the second In site, In(1) is bonded in a body-centered cubic geometry to eight equivalent Mg(2) atoms. In the third In site, In(2) is bonded in a 10-coordinate geometry to two equivalent K(1), two equivalent Mg(2), four equivalent Mg(1), and two equivalent In(2) atoms.
K3(Mg10In7)2 crystallizes in the cubic Pm-3m space group. K(1) is bonded in a 20-coordinate geometry to four equivalent Mg(1), eight equivalent Mg(2), and eight equivalent In(2) atoms. All K(1)-Mg(1) bond lengths are 3.70 Å. All K(1)-Mg(2) bond lengths are 4.03 Å. All K(1)-In(2) bond lengths are 3.75 Å. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 5-coordinate geometry to one K(1), one In(3), and four equivalent In(2) atoms. The Mg(1)-In(3) bond length is 3.27 Å. All Mg(1)-In(2) bond lengths are 3.12 Å. In the second Mg site, Mg(2) is bonded to three equivalent K(1), one In(1), and three equivalent In(2) atoms to form a mixture of face, corner, and edge-sharing MgK3In4 tetrahedra. The Mg(2)-In(1) bond length is 2.98 Å. All Mg(2)-In(2) bond lengths are 2.98 Å. There are three inequivalent In sites. In the first In site, In(3) is bonded in a cuboctahedral geometry to twelve equivalent Mg(1) atoms. In the second In site, In(1) is bonded in a body-centered cubic geometry to eight equivalent Mg(2) atoms. In the third In site, In(2) is bonded in a 10-coordinate geometry to two equivalent K(1), two equivalent Mg(2), four equivalent Mg(1), and two equivalent In(2) atoms. Both In(2)-In(2) bond lengths are 2.97 Å.