Materials Data on Tb2MgSe4 by Materials Project

MgTb2Se4 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 TbSe6 octahedra. The corner-sharing octahedral tilt angles are 56°. All Mg–Se bond lengths are 2.63 Å. Tb3+ is bonded to six equivalent Se2- atoms to form TbSe6 octahedra that share corners with six equivalent MgSe4 tetrahedra and edges with six equivalent TbSe6 octahedra. All Tb–Se bond lengths are 2.89 Å. Se2- is bonded in a distorted rectangular see-saw-like geometry to one Mg2+ and three equivalent Tb3+ atoms.

MgTb₂Se₄ 具有尖晶石（Spinel）结构，结晶于立方晶系Fd-3m空间群。该晶体结构为三维网状结构。Mg²+与四个等价的Se²-离子配位，形成MgSe₄四面体，该四面体与十二个等价的TbSe₆八面体共顶点。共顶点八面体的倾斜角为56°。所有Mg-Se键长均为2.63 Å。Tb³+与六个等价的Se²-离子配位，形成TbSe₆八面体，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TbSe₆八面体共边。所有Tb-Se键长均为2.89 Å。Se²-以畸变的矩形跷跷板型配位几何，与一个Mg²+和三个等价的Tb³+离子成键。