Materials Data on PmAs3 by Materials Project
PmAs3 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pm3+ is bonded to twelve As1- atoms to form a mixture of corner, edge, and face-sharing PmAs12 cuboctahedra. There are four shorter (2.94 Å) and eight longer (3.26 Å) Pm–As bond lengths. There are two inequivalent As1- sites. In the first As1- site, As1- is bonded in a 8-coordinate geometry to four equivalent Pm3+ and four equivalent As1- atoms. All As–As bond lengths are 2.94 Å. In the second As1- site, As1- is bonded in a square co-planar geometry to four equivalent Pm3+ atoms.
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