Materials Data on Eu3Si4 by Materials Project

Eu3Si4 crystallizes in the orthorhombic Imm2 space group. The structure is three-dimensional. there are two inequivalent Eu+2.67+ sites. In the first Eu+2.67+ site, Eu+2.67+ is bonded to twelve Si2- atoms to form a mixture of edge and face-sharing EuSi12 cuboctahedra. There are a spread of Eu–Si bond distances ranging from 3.20–3.42 Å. In the second Eu+2.67+ site, Eu+2.67+ is bonded in a 7-coordinate geometry to seven Si2- atoms. There are a spread of Eu–Si bond distances ranging from 3.11–3.24 Å. There are two inequivalent Si2- sites. In the first Si2- site, Si2- is bonded in a 9-coordinate geometry to seven Eu+2.67+ and two equivalent Si2- atoms. Both Si–Si bond lengths are 2.40 Å. In the second Si2- site, Si2- is bonded in a 9-coordinate geometry to six Eu+2.67+ and three Si2- atoms. The Si–Si bond length is 2.37 Å.

Eu₃Si₄结晶于正交晶系Imm2空间群。其结构为三维结构。存在两个不等价的Eu²⁺·⁶⁷位点。在第一个Eu²⁺·⁶⁷位点中，Eu²⁺·⁶⁷与12个Si²⁻原子键合，形成边共享和面共享的EuSi₁₂立方八面体的混合结构。Eu–Si键长分布在3.20–3.42 Å之间。在第二个Eu²⁺·⁶⁷位点中，Eu²⁺·⁶⁷以七配位几何结构与7个Si²⁻原子键合。存在两个不等价的Si²⁻位点。在第一个Si²⁻位点中，Si²⁻以九配位几何结构与7个Eu²⁺·⁶⁷和2个等价的Si²⁻原子键合，两个Si–Si键的键长均为2.40 Å。在第二个Si²⁻位点中，Si²⁻以九配位几何结构与6个Eu²⁺·⁶⁷和3个Si²⁻原子键合，其Si–Si键长为2.37 Å。