MgDy2Se4 is Spinel structured and crystallizes in the cubic Fd-3m space group. Mg(1) is bonded to four equivalent Se(1) atoms to form MgSe4 tetrahedra that share corners with twelve equivalent Dy(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 56°. Dy(1) is bonded to six equivalent Se(1) atoms to form DySe6 octahedra that share corners with six equivalent Mg(1)Se4 tetrahedra and edges with six equivalent Dy(1)Se6 octahedra. Se(1) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1) and three equivalent Dy(1) atoms.
MgDy2Se4 is Spinel structured and crystallizes in the cubic Fd-3m space group. Mg(1) is bonded to four equivalent Se(1) atoms to form MgSe4 tetrahedra that share corners with twelve equivalent Dy(1)Se6 octahedra. The corner-sharing octahedral tilt angles are 56°. All Mg(1)-Se(1) bond lengths are 2.61 Å. Dy(1) is bonded to six equivalent Se(1) atoms to form DySe6 octahedra that share corners with six equivalent Mg(1)Se4 tetrahedra and edges with six equivalent Dy(1)Se6 octahedra. All Dy(1)-Se(1) bond lengths are 2.85 Å. Se(1) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1) and three equivalent Dy(1) atoms.