Mg2Y is Bergman Structure: Mg32(Al,Zn)49 Bergman-derived structured and crystallizes in the monoclinic C2/m space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to three equivalent Mg(2), four equivalent Mg(1), and five equivalent Y(1) atoms to form a mixture of face, corner, and edge-sharing MgY5Mg7 cuboctahedra. In the second Mg site, Mg(2) is bonded in a 11-coordinate geometry to three equivalent Mg(1), four equivalent Mg(2), and four equivalent Y(1) atoms. Y(1) is bonded in a 12-coordinate geometry to four equivalent Mg(2), five equivalent Mg(1), and three equivalent Y(1) atoms.
Mg2Y is Bergman Structure: Mg32(Al,Zn)49 Bergman-derived structured and crystallizes in the monoclinic C2/m space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to three equivalent Mg(2), four equivalent Mg(1), and five equivalent Y(1) atoms to form a mixture of face, corner, and edge-sharing MgY5Mg7 cuboctahedra. There are two shorter (3.16 Å) and one longer (3.17 Å) Mg(1)-Mg(2) bond length. There are two shorter (3.18 Å) and two longer (3.39 Å) Mg(1)-Mg(1) bond lengths. There are a spread of Mg(1)-Y(1) bond distances ranging from 3.42-3.63 Å. In the second Mg site, Mg(2) is bonded in a 11-coordinate geometry to three equivalent Mg(1), four equivalent Mg(2), and four equivalent Y(1) atoms. There are two shorter (3.07 Å) and two longer (3.39 Å) Mg(2)-Mg(2) bond lengths. All Mg(2)-Y(1) bond lengths are 3.30 Å. Y(1) is bonded in a 12-coordinate geometry to four equivalent Mg(2), five equivalent Mg(1), and three equivalent Y(1) atoms. There are two shorter (3.39 Å) and one longer (3.48 Å) Y(1)-Y(1) bond length.