Materials Data on Er2CuO4 by Materials Project
Er2CuO4 crystallizes in the orthorhombic Cmce space group. The structure is three-dimensional. Er3+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Er–O bond distances ranging from 2.20–2.38 Å. Cu2+ is bonded in a square co-planar geometry to four equivalent O2- atoms. There is two shorter (1.97 Å) and two longer (1.98 Å) Cu–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Er3+ and two equivalent Cu2+ atoms. In the second O2- site, O2- is bonded to four equivalent Er3+ atoms to form a mixture of edge and corner-sharing OEr4 tetrahedra.
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