Ag3Mg is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. Mg(1) is bonded to four equivalent Ag(1) and eight equivalent Ag(2) atoms to form MgAg12 cuboctahedra that share corners with four equivalent Mg(1)Ag12 cuboctahedra, corners with eight equivalent Ag(1)Mg4Ag8 cuboctahedra, edges with eight equivalent Mg(1)Ag12 cuboctahedra, edges with sixteen equivalent Ag(2)Mg4Ag8 cuboctahedra, faces with four equivalent Mg(1)Ag12 cuboctahedra, faces with six equivalent Ag(1)Mg4Ag8 cuboctahedra, and faces with eight equivalent Ag(2)Mg4Ag8 cuboctahedra. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to four equivalent Mg(1) and eight equivalent Ag(2) atoms to form distorted AgMg4Ag8 cuboctahedra that share corners with four equivalent Ag(1)Mg4Ag8 cuboctahedra, corners with eight equivalent Mg(1)Ag12 cuboctahedra, edges with eight equivalent Ag(1)Mg4Ag8 cuboctahedra, edges with sixteen equivalent Ag(2)Mg4Ag8 cuboctahedra, faces with four equivalent Ag(1)Mg4Ag8 cuboctahedra, faces with six equivalent Mg(1)Ag12 cuboctahedra, and faces with eight equivalent Ag(2)Mg4Ag8 cuboctahedra. In the second Ag site, Ag(2) is bonded to four equivalent Mg(1), four equivalent Ag(1), and four equivalent Ag(2) atoms to form distorted AgMg4Ag8 cuboctahedra that share corners with twelve equivalent Ag(2)Mg4Ag8 cuboctahedra, edges with eight equivalent Mg(1)Ag12 cuboctahedra, edges with eight equivalent Ag(1)Mg4Ag8 cuboctahedra, edges with eight equivalent Ag(2)Mg4Ag8 cuboctahedra, faces with four equivalent Mg(1)Ag12 cuboctahedra, faces with four equivalent Ag(1)Mg4Ag8 cuboctahedra, and faces with ten equivalent Ag(2)Mg4Ag8 cuboctahedra.
Ag3Mg is Uranium Silicide-like structured and crystallizes in the tetragonal I4/mmm space group. Mg(1) is bonded to four equivalent Ag(1) and eight equivalent Ag(2) atoms to form MgAg12 cuboctahedra that share corners with four equivalent Mg(1)Ag12 cuboctahedra, corners with eight equivalent Ag(1)Mg4Ag8 cuboctahedra, edges with eight equivalent Mg(1)Ag12 cuboctahedra, edges with sixteen equivalent Ag(2)Mg4Ag8 cuboctahedra, faces with four equivalent Mg(1)Ag12 cuboctahedra, faces with six equivalent Ag(1)Mg4Ag8 cuboctahedra, and faces with eight equivalent Ag(2)Mg4Ag8 cuboctahedra. All Mg(1)-Ag(1) bond lengths are 2.90 Å. All Mg(1)-Ag(2) bond lengths are 2.92 Å. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded to four equivalent Mg(1) and eight equivalent Ag(2) atoms to form distorted AgMg4Ag8 cuboctahedra that share corners with four equivalent Ag(1)Mg4Ag8 cuboctahedra, corners with eight equivalent Mg(1)Ag12 cuboctahedra, edges with eight equivalent Ag(1)Mg4Ag8 cuboctahedra, edges with sixteen equivalent Ag(2)Mg4Ag8 cuboctahedra, faces with four equivalent Ag(1)Mg4Ag8 cuboctahedra, faces with six equivalent Mg(1)Ag12 cuboctahedra, and faces with eight equivalent Ag(2)Mg4Ag8 cuboctahedra. All Ag(1)-Ag(2) bond lengths are 2.92 Å. In the second Ag site, Ag(2) is bonded to four equivalent Mg(1), four equivalent Ag(1), and four equivalent Ag(2) atoms to form distorted AgMg4Ag8 cuboctahedra that share corners with twelve equivalent Ag(2)Mg4Ag8 cuboctahedra, edges with eight equivalent Mg(1)Ag12 cuboctahedra, edges with eight equivalent Ag(1)Mg4Ag8 cuboctahedra, edges with eight equivalent Ag(2)Mg4Ag8 cuboctahedra, faces with four equivalent Mg(1)Ag12 cuboctahedra, faces with four equivalent Ag(1)Mg4Ag8 cuboctahedra, and faces with ten equivalent Ag(2)Mg4Ag8 cuboctahedra. All Ag(2)-Ag(2) bond lengths are 2.90 Å.