Materials Data on ErAs3 by Materials Project
ErAs3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Er3+ is bonded to twelve equivalent As1- atoms to form a mixture of face and corner-sharing ErAs12 cuboctahedra. There are six shorter (3.00 Å) and six longer (3.15 Å) Er–As bond lengths. As1- is bonded in a 6-coordinate geometry to four equivalent Er3+ and two equivalent As1- atoms. Both As–As bond lengths are 2.72 Å.
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