Materials Data on Er2MgSi2 by Materials Project
MgEr2Si2 crystallizes in the tetragonal P4/mbm space group. The structure is three-dimensional. Mg2+ is bonded in a square co-planar geometry to four equivalent Si4- atoms. All Mg–Si bond lengths are 2.84 Å. Er3+ is bonded in a distorted hexagonal planar geometry to six equivalent Si4- atoms. There are two shorter (2.92 Å) and four longer (3.01 Å) Er–Si bond lengths. Si4- is bonded in a 9-coordinate geometry to two equivalent Mg2+, six equivalent Er3+, and one Si4- atom. The Si–Si bond length is 2.39 Å.
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