Materials Data on ErTe3 by Materials Project
ErTe3 crystallizes in the orthorhombic Cmcm space group. The structure is two-dimensional and consists of four ErTe3 sheets oriented in the (0, 1, 0) direction. Er3+ is bonded to five Te1- atoms to form a mixture of distorted edge and corner-sharing ErTe5 square pyramids. There are four shorter (3.01 Å) and one longer (3.17 Å) Er–Te bond lengths. There are three inequivalent Te1- sites. In the first Te1- site, Te1- is bonded in a 4-coordinate geometry to four equivalent Te1- atoms. All Te–Te bond lengths are 3.08 Å. In the second Te1- site, Te1- is bonded in a distorted square co-planar geometry to four equivalent Er3+ atoms. In the third Te1- site, Te1- is bonded in a distorted single-bond geometry to one Er3+ and four equivalent Te1- atoms.