Materials Data on RbErS2 by Materials Project
RbErS2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Rb1+ is bonded in a 6-coordinate geometry to six equivalent S2- atoms. All Rb–S bond lengths are 3.33 Å. Er3+ is bonded to six equivalent S2- atoms to form edge-sharing ErS6 octahedra. All Er–S bond lengths are 2.76 Å. S2- is bonded to three equivalent Rb1+ and three equivalent Er3+ atoms to form a mixture of distorted edge and corner-sharing SRb3Er3 octahedra. The corner-sharing octahedral tilt angles are 0°.
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