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EuSi2 is hexagonal omega structure structured and crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Eu is bonded to twelve equivalent Si atoms to form a mixture of edge and face-sharing EuSi12 cuboctahedra. All Eu–Si bond lengths are 3.17 Å. Si is bonded in a 9-coordinate geometry to six equivalent Eu and three equivalent Si atoms. All Si–Si bond lengths are 2.36 Å.
SiEu crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Eu is bonded in a 7-coordinate geometry to seven equivalent Si atoms. There are a spread of Eu–Si bond distances ranging from 3.14–3.26 Å. Si is bonded in a 9-coordinate geometry to seven equivalent Eu and two equivalent Si atoms. Both Si–Si bond lengths are 2.46 Å.
EuSi6 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Eu is bonded in a 8-coordinate geometry to eighteen Si atoms. There are a spread of Eu–Si bond distances ranging from 3.12–3.51 Å. There are three inequivalent Si sites. In the first Si site, Si is bonded in a 7-coordinate geometry to three equivalent Eu and four Si atoms. There are a spread of Si–Si bond distances ranging from 2.37–2.44 Å. In the second Si site, Si is bonded in a 7-coordinate geometry to three equivalent Eu and four Si atoms. All Si–Si bond lengths are 2.41 Å. In the third Si site, Si is bonded in a 4-coordinate geometry to three equivalent Eu and four Si atoms. The Si–Si bond length is 2.41 Å.
Eu5Si3 crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. there are two inequivalent Eu+2.40+ sites. In the first Eu+2.40+ site, Eu+2.40+ is bonded to five Si4- atoms to form a mixture of edge, face, and corner-sharing EuSi5 trigonal bipyramids. There are a spread of Eu–Si bond distances ranging from 3.17–3.27 Å. In the second Eu+2.40+ site, Eu+2.40+ is bonded in a distorted square co-planar geometry to four equivalent Si4- atoms. All Eu–Si bond lengths are 3.16 Å. There are two inequivalent Si4- sites. In the first Si4- site, Si4- is bonded in a 9-coordinate geometry to eight Eu+2.40+ and one Si4- atom. The Si–Si bond length is 2.44 Å. In the second Si4- site, Si4- is bonded in a 10-coordinate geometry to eight equivalent Eu+2.40+ atoms.
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.