Materials Data on Mg3Si2 by Materials Project

Mg3Si2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 4-coordinate geometry to six equivalent Si atoms. There are a spread of Mg–Si bond distances ranging from 2.83–3.08 Å. In the second Mg site, Mg is bonded in a 4-coordinate geometry to four equivalent Si atoms. There are two shorter (2.72 Å) and two longer (2.78 Å) Mg–Si bond lengths. Si is bonded in a 9-coordinate geometry to eight Mg and one Si atom. The Si–Si bond length is 2.39 Å.

Mg₃Si₂结晶于单斜晶系C2/m空间群。其结构为三维结构。体系中存在两个不等价的镁（Mg）位点。在第一个镁位点中，镁原子以四配位构型与六个等价的硅（Si）原子成键，Mg–Si键的键长分布范围为2.83~3.08埃。在第二个镁位点中，镁原子以四配位构型与四个等价的硅原子成键，对应Mg–Si键长分为两组：两个较短键长为2.72埃，两个较长键长为2.78埃。硅原子以九配位构型与八个镁原子及一个硅原子成键，Si–Si键的键长为2.39埃。