NaMg6Y is beta Cu3Ti-derived structured and crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Y(1) atoms to form NaY2Mg10 cuboctahedra that share corners with four equivalent Mg(4)Na2Mg10 cuboctahedra, corners with six equivalent Na(1)Y2Mg10 cuboctahedra, corners with eight equivalent Mg(3)Na2Y2Mg8 cuboctahedra, edges with two equivalent Mg(4)Na2Mg10 cuboctahedra, edges with four equivalent Mg(3)Na2Y2Mg8 cuboctahedra, edges with four equivalent Y(1)Na2Mg10 cuboctahedra, edges with eight equivalent Mg(1)Na2Y2Mg8 cuboctahedra, faces with two equivalent Na(1)Y2Mg10 cuboctahedra, faces with two equivalent Mg(4)Na2Mg10 cuboctahedra, faces with two equivalent Y(1)Na2Mg10 cuboctahedra, faces with four equivalent Mg(1)Na2Y2Mg8 cuboctahedra, faces with four equivalent Mg(3)Na2Y2Mg8 cuboctahedra, and faces with six equivalent Mg(2)Y2Mg10 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Y(1) atoms to form distorted MgNa2Y2Mg8 cuboctahedra that share corners with four equivalent Mg(2)Y2Mg10 cuboctahedra, corners with four equivalent Y(1)Na2Mg10 cuboctahedra, corners with ten equivalent Mg(1)Na2Y2Mg8 cuboctahedra, edges with two equivalent Mg(1)Na2Y2Mg8 cuboctahedra, edges with two equivalent Mg(2)Y2Mg10 cuboctahedra, edges with two equivalent Y(1)Na2Mg10 cuboctahedra, edges with four equivalent Na(1)Y2Mg10 cuboctahedra, edges with four equivalent Mg(4)Na2Mg10 cuboctahedra, edges with four equivalent Mg(3)Na2Y2Mg8 cuboctahedra, faces with two equivalent Na(1)Y2Mg10 cuboctahedra, faces with two equivalent Mg(4)Na2Mg10 cuboctahedra, faces with two equivalent Mg(2)Y2Mg10 cuboctahedra, faces with two equivalent Y(1)Na2Mg10 cuboctahedra, faces with four equivalent Mg(1)Na2Y2Mg8 cuboctahedra, and faces with eight equivalent Mg(3)Na2Y2Mg8 cuboctahedra. In the second Mg site, Mg(2) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Y(1) atoms to form MgY2Mg10 cuboctahedra that share corners with four equivalent Y(1)Na2Mg10 cuboctahedra, corners with six equivalent Mg(2)Y2Mg10 cuboctahedra, corners with eight equivalent Mg(1)Na2Y2Mg8 cuboctahedra, edges with two equivalent Y(1)Na2Mg10 cuboctahedra, edges with four equivalent Mg(4)Na2Mg10 cuboctahedra, edges with four equivalent Mg(1)Na2Y2Mg8 cuboctahedra, edges with eight equivalent Mg(3)Na2Y2Mg8 cuboctahedra, faces with two equivalent Mg(4)Na2Mg10 cuboctahedra, faces with two equivalent Mg(2)Y2Mg10 cuboctahedra, faces with two equivalent Y(1)Na2Mg10 cuboctahedra, faces with four equivalent Mg(1)Na2Y2Mg8 cuboctahedra, faces with four equivalent Mg(3)Na2Y2Mg8 cuboctahedra, and faces with six equivalent Na(1)Y2Mg10 cuboctahedra. In the third Mg site, Mg(3) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Y(1) atoms to form distorted MgNa2Y2Mg8 cuboctahedra that share corners with four equivalent Na(1)Y2Mg10 cuboctahedra, corners with four equivalent Mg(4)Na2Mg10 cuboctahedra, corners with ten equivalent Mg(3)Na2Y2Mg8 cuboctahedra, edges with two equivalent Na(1)Y2Mg10 cuboctahedra, edges with two equivalent Mg(4)Na2Mg10 cuboctahedra, edges with two equivalent Mg(3)Na2Y2Mg8 cuboctahedra, edges with four equivalent Mg(1)Na2Y2Mg8 cuboctahedra, edges with four equivalent Mg(2)Y2Mg10 cuboctahedra, edges with four equivalent Y(1)Na2Mg10 cuboctahedra, faces with two equivalent Na(1)Y2Mg10 cuboctahedra, faces with two equivalent Mg(4)Na2Mg10 cuboctahedra, faces with two equivalent Mg(2)Y2Mg10 cuboctahedra, faces with two equivalent Y(1)Na2Mg10 cuboctahedra, faces with four equivalent Mg(3)Na2Y2Mg8 cuboctahedra, and faces with eight equivalent Mg(1)Na2Y2Mg8 cuboctahedra. In the fourth Mg site, Mg(4) is bonded to two equivalent Na(1), two equivalent Mg(2), four equivalent Mg(1), and four equivalent Mg(3) atoms to form distorted MgNa2Mg10 cuboctahedra that share corners with four equivalent Na(1)Y2Mg10 cuboctahedra, corners with six equivalent Mg(4)Na2Mg10 cuboctahedra, corners with eight equivalent Mg(3)Na2Y2Mg8 cuboctahedra, edges with two equivalent Na(1)Y2Mg10 cuboctahedra, edges with four equivalent Mg(3)Na2Y2Mg8 cuboctahedra, edges with four equivalent Mg(2)Y2Mg10 cuboctahedra, edges with eight equivalent Mg(1)Na2Y2Mg8 cuboctahedra, faces with two equivalent Na(1)Y2Mg10 cuboctahedra, faces with two equivalent Mg(4)Na2Mg10 cuboctahedra, faces with two equivalent Mg(2)Y2Mg10 cuboctahedra, faces with four equivalent Mg(1)Na2Y2Mg8 cuboctahedra, faces with four equivalent Mg(3)Na2Y2Mg8 cuboctahedra, and faces with six equivalent Y(1)Na2Mg10 cuboctahedra. Y(1) is bonded to two equivalent Na(1), two equivalent Mg(2), four equivalent Mg(1), and four equivalent Mg(3) atoms to form YNa2Mg10 cuboctahedra that share corners with four equivalent Mg(2)Y2Mg10 cuboctahedra, corners with six equivalent Y(1)Na2Mg10 cuboctahedra, corners with eight equivalent Mg(1)Na2Y2Mg8 cuboctahedra, edges with two equivalent Mg(2)Y2Mg10 cuboctahedra, edges with four equivalent Na(1)Y2Mg10 cuboctahedra, edges with four equivalent Mg(1)Na2Y2Mg8 cuboctahedra, edges with eight equivalent Mg(3)Na2Y2Mg8 cuboctahedra, faces with two equivalent Na(1)Y2Mg10 cuboctahedra, faces with two equivalent Mg(2)Y2Mg10 cuboctahedra, faces with two equivalent Y(1)Na2Mg10 cuboctahedra, faces with four equivalent Mg(1)Na2Y2Mg8 cuboctahedra, faces with four equivalent Mg(3)Na2Y2Mg8 cuboctahedra, and faces with six equivalent Mg(4)Na2Mg10 cuboctahedra.
NaMg6Y is beta Cu3Ti-derived structured and crystallizes in the orthorhombic Amm2 space group. Na(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Y(1) atoms to form NaY2Mg10 cuboctahedra that share corners with four equivalent Mg(4)Na2Mg10 cuboctahedra, corners with six equivalent Na(1)Y2Mg10 cuboctahedra, corners with eight equivalent Mg(3)Na2Y2Mg8 cuboctahedra, edges with two equivalent Mg(4)Na2Mg10 cuboctahedra, edges with four equivalent Mg(3)Na2Y2Mg8 cuboctahedra, edges with four equivalent Y(1)Na2Mg10 cuboctahedra, edges with eight equivalent Mg(1)Na2Y2Mg8 cuboctahedra, faces with two equivalent Na(1)Y2Mg10 cuboctahedra, faces with two equivalent Mg(4)Na2Mg10 cuboctahedra, faces with two equivalent Y(1)Na2Mg10 cuboctahedra, faces with four equivalent Mg(1)Na2Y2Mg8 cuboctahedra, faces with four equivalent Mg(3)Na2Y2Mg8 cuboctahedra, and faces with six equivalent Mg(2)Y2Mg10 cuboctahedra. Both Na(1)-Mg(4) bond lengths are 3.33 Å. All Na(1)-Mg(1) bond lengths are 3.25 Å. There are two shorter (3.28 Å) and two longer (3.39 Å) Na(1)-Mg(3) bond lengths. Both Na(1)-Y(1) bond lengths are 3.32 Å. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Y(1) atoms to form distorted MgNa2Y2Mg8 cuboctahedra that share corners with four equivalent Mg(2)Y2Mg10 cuboctahedra, corners with four equivalent Y(1)Na2Mg10 cuboctahedra, corners with ten equivalent Mg(1)Na2Y2Mg8 cuboctahedra, edges with two equivalent Mg(1)Na2Y2Mg8 cuboctahedra, edges with two equivalent Mg(2)Y2Mg10 cuboctahedra, edges with two equivalent Y(1)Na2Mg10 cuboctahedra, edges with four equivalent Na(1)Y2Mg10 cuboctahedra, edges with four equivalent Mg(4)Na2Mg10 cuboctahedra, edges with four equivalent Mg(3)Na2Y2Mg8 cuboctahedra, faces with two equivalent Na(1)Y2Mg10 cuboctahedra, faces with two equivalent Mg(4)Na2Mg10 cuboctahedra, faces with two equivalent Mg(2)Y2Mg10 cuboctahedra, faces with two equivalent Y(1)Na2Mg10 cuboctahedra, faces with four equivalent Mg(1)Na2Y2Mg8 cuboctahedra, and faces with eight equivalent Mg(3)Na2Y2Mg8 cuboctahedra. There is one shorter (3.31 Å) and one longer (3.35 Å) Mg(1)-Mg(1) bond length. There is one shorter (3.28 Å) and one longer (3.39 Å) Mg(1)-Mg(2) bond length. Both Mg(1)-Mg(3) bond lengths are 3.25 Å. Both Mg(1)-Mg(4) bond lengths are 3.27 Å. There is one shorter (3.28 Å) and one longer (3.39 Å) Mg(1)-Y(1) bond length. In the second Mg site, Mg(2) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(3), and two equivalent Y(1) atoms to form MgY2Mg10 cuboctahedra that share corners with four equivalent Y(1)Na2Mg10 cuboctahedra, corners with six equivalent Mg(2)Y2Mg10 cuboctahedra, corners with eight equivalent Mg(1)Na2Y2Mg8 cuboctahedra, edges with two equivalent Y(1)Na2Mg10 cuboctahedra, edges with four equivalent Mg(4)Na2Mg10 cuboctahedra, edges with four equivalent Mg(1)Na2Y2Mg8 cuboctahedra, edges with eight equivalent Mg(3)Na2Y2Mg8 cuboctahedra, faces with two equivalent Mg(4)Na2Mg10 cuboctahedra, faces with two equivalent Mg(2)Y2Mg10 cuboctahedra, faces with two equivalent Y(1)Na2Mg10 cuboctahedra, faces with four equivalent Mg(1)Na2Y2Mg8 cuboctahedra, faces with four equivalent Mg(3)Na2Y2Mg8 cuboctahedra, and faces with six equivalent Na(1)Y2Mg10 cuboctahedra. Both Mg(2)-Mg(4) bond lengths are 3.28 Å. All Mg(2)-Mg(3) bond lengths are 3.25 Å. Both Mg(2)-Y(1) bond lengths are 3.33 Å. In the third Mg site, Mg(3) is bonded to two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Y(1) atoms to form distorted MgNa2Y2Mg8 cuboctahedra that share corners with four equivalent Na(1)Y2Mg10 cuboctahedra, corners with four equivalent Mg(4)Na2Mg10 cuboctahedra, corners with ten equivalent Mg(3)Na2Y2Mg8 cuboctahedra, edges with two equivalent Na(1)Y2Mg10 cuboctahedra, edges with two equivalent Mg(4)Na2Mg10 cuboctahedra, edges with two equivalent Mg(3)Na2Y2Mg8 cuboctahedra, edges with four equivalent Mg(1)Na2Y2Mg8 cuboctahedra, edges with four equivalent Mg(2)Y2Mg10 cuboctahedra, edges with four equivalent Y(1)Na2Mg10 cuboctahedra, faces with two equivalent Na(1)Y2Mg10 cuboctahedra, faces with two equivalent Mg(4)Na2Mg10 cuboctahedra, faces with two equivalent Mg(2)Y2Mg10 cuboctahedra, faces with two equivalent Y(1)Na2Mg10 cuboctahedra, faces with four equivalent Mg(3)Na2Y2Mg8 cuboctahedra, and faces with eight equivalent Mg(1)Na2Y2Mg8 cuboctahedra. There is one shorter (3.31 Å) and one longer (3.34 Å) Mg(3)-Mg(3) bond length. Both Mg(3)-Mg(4) bond lengths are 3.34 Å. Both Mg(3)-Y(1) bond lengths are 3.25 Å. In the fourth Mg site, Mg(4) is bonded to two equivalent Na(1), two equivalent Mg(2), four equivalent Mg(1), and four equivalent Mg(3) atoms to form distorted MgNa2Mg10 cuboctahedra that share corners with four equivalent Na(1)Y2Mg10 cuboctahedra, corners with six equivalent Mg(4)Na2Mg10 cuboctahedra, corners with eight equivalent Mg(3)Na2Y2Mg8 cuboctahedra, edges with two equivalent Na(1)Y2Mg10 cuboctahedra, edges with four equivalent Mg(3)Na2Y2Mg8 cuboctahedra, edges with four equivalent Mg(2)Y2Mg10 cuboctahedra, edges with eight equivalent Mg(1)Na2Y2Mg8 cuboctahedra, faces with two equivalent Na(1)Y2Mg10 cuboctahedra, faces with two equivalent Mg(4)Na2Mg10 cuboctahedra, faces with two equivalent Mg(2)Y2Mg10 cuboctahedra, faces with four equivalent Mg(1)Na2Y2Mg8 cuboctahedra, faces with four equivalent Mg(3)Na2Y2Mg8 cuboctahedra, and faces with six equivalent Y(1)Na2Mg10 cuboctahedra. Y(1) is bonded to two equivalent Na(1), two equivalent Mg(2), four equivalent Mg(1), and four equivalent Mg(3) atoms to form YNa2Mg10 cuboctahedra that share corners with four equivalent Mg(2)Y2Mg10 cuboctahedra, corners with six equivalent Y(1)Na2Mg10 cuboctahedra, corners with eight equivalent Mg(1)Na2Y2Mg8 cuboctahedra, edges with two equivalent Mg(2)Y2Mg10 cuboctahedra, edges with four equivalent Na(1)Y2Mg10 cuboctahedra, edges with four equivalent Mg(1)Na2Y2Mg8 cuboctahedra, edges with eight equivalent Mg(3)Na2Y2Mg8 cuboctahedra, faces with two equivalent Na(1)Y2Mg10 cuboctahedra, faces with two equivalent Mg(2)Y2Mg10 cuboctahedra, faces with two equivalent Y(1)Na2Mg10 cuboctahedra, faces with four equivalent Mg(1)Na2Y2Mg8 cuboctahedra, faces with four equivalent Mg(3)Na2Y2Mg8 cuboctahedra, and faces with six equivalent Mg(4)Na2Mg10 cuboctahedra.