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.