Materials Data on PmP3 by Materials Project
PmP3 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pm3+ is bonded to twelve P1- atoms to form a mixture of corner, edge, and face-sharing PmP12 cuboctahedra. There are four shorter (2.81 Å) and eight longer (3.12 Å) Pm–P bond lengths. There are two inequivalent P1- sites. In the first P1- site, P1- is bonded in a 8-coordinate geometry to four equivalent Pm3+ and four equivalent P1- atoms. All P–P bond lengths are 2.81 Å. In the second P1- site, P1- is bonded in a square co-planar geometry to four equivalent Pm3+ atoms.
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