Materials Data on Er2MgSe4 by Materials Project

MgEr2Se4 is Spinel structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Mg2+ is bonded to four equivalent Se2- atoms to form MgSe4 tetrahedra that share corners with twelve equivalent ErSe6 octahedra. The corner-sharing octahedral tilt angles are 56°. All Mg–Se bond lengths are 2.62 Å. Er3+ is bonded to six equivalent Se2- atoms to form ErSe6 octahedra that share corners with six equivalent MgSe4 tetrahedra and edges with six equivalent ErSe6 octahedra. All Er–Se bond lengths are 2.85 Å. Se2- is bonded in a distorted rectangular see-saw-like geometry to one Mg2+ and three equivalent Er3+ atoms.

MgEr₂Se₄为尖晶石结构，结晶于立方晶系Fd-3m空间群。该结构为三维网状结构。Mg²+与四个等价的Se²-配位，形成MgSe₄四面体，该四面体与十二个等价的ErSe₆八面体共顶点。共顶点八面体的倾斜角为56°。所有Mg–Se键的键长均为2.62 Å。Er³+与六个等价的Se²-配位，形成ErSe₆八面体，该八面体与六个等价的MgSe₄四面体共顶点，同时与六个等价的ErSe₆八面体共边。所有Er–Se键的键长均为2.85 Å。Se²-以畸变的矩形跷跷板状配位几何与一个Mg²+和三个等价的Er³+配位。