Mg6CeMn crystallizes in the orthorhombic Amm2 space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 1-coordinate geometry to two equivalent Mg(3), two equivalent Mg(4), and one Mn(1) atom. In the second Mg site, Mg(2) is bonded in a 8-coordinate geometry to two equivalent Mg(4), four equivalent Mg(3), and two equivalent Mn(1) atoms. In the third Mg site, Mg(3) is bonded in a 11-coordinate geometry to one Mg(4), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Ce(1), and two equivalent Mn(1) atoms. In the fourth Mg site, Mg(4) is bonded in a 10-coordinate geometry to two equivalent Mg(2), two equivalent Mg(3), four equivalent Mg(1), and two equivalent Ce(1) atoms. Ce(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Mg(4), four equivalent Mg(3), and two equivalent Mn(1) atoms. Mn(1) is bonded in a 2-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), four equivalent Mg(3), and two equivalent Ce(1) atoms.
Mg6CeMn crystallizes in the orthorhombic Amm2 space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 1-coordinate geometry to two equivalent Mg(3), two equivalent Mg(4), and one Mn(1) atom. Both Mg(1)-Mg(3) bond lengths are 2.92 Å. Both Mg(1)-Mg(4) bond lengths are 2.99 Å. The Mg(1)-Mn(1) bond length is 2.91 Å. In the second Mg site, Mg(2) is bonded in a 8-coordinate geometry to two equivalent Mg(4), four equivalent Mg(3), and two equivalent Mn(1) atoms. Both Mg(2)-Mg(4) bond lengths are 2.99 Å. All Mg(2)-Mg(3) bond lengths are 3.11 Å. Both Mg(2)-Mn(1) bond lengths are 3.19 Å. In the third Mg site, Mg(3) is bonded in a 11-coordinate geometry to one Mg(4), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Ce(1), and two equivalent Mn(1) atoms. The Mg(3)-Mg(4) bond length is 3.22 Å. There is one shorter (3.14 Å) and one longer (3.18 Å) Mg(3)-Mg(3) bond length. There is one shorter (3.08 Å) and one longer (3.78 Å) Mg(3)-Ce(1) bond length. Both Mg(3)-Mn(1) bond lengths are 3.33 Å. In the fourth Mg site, Mg(4) is bonded in a 10-coordinate geometry to two equivalent Mg(2), two equivalent Mg(3), four equivalent Mg(1), and two equivalent Ce(1) atoms. Both Mg(4)-Ce(1) bond lengths are 3.22 Å. Ce(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Mg(4), four equivalent Mg(3), and two equivalent Mn(1) atoms. Both Ce(1)-Mn(1) bond lengths are 2.44 Å. Mn(1) is bonded in a 2-coordinate geometry to two equivalent Mg(1), two equivalent Mg(2), four equivalent Mg(3), and two equivalent Ce(1) atoms.