Materials Data on PmSe2 by Materials Project
PmSe2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Pm3+ is bonded in a 9-coordinate geometry to nine Se+1.50- atoms. There are a spread of Pm–Se bond distances ranging from 3.04–3.13 Å. There are two inequivalent Se+1.50- sites. In the first Se+1.50- site, Se+1.50- is bonded in a 8-coordinate geometry to four equivalent Pm3+ and four equivalent Se+1.50- atoms. All Se–Se bond lengths are 2.93 Å. In the second Se+1.50- site, Se+1.50- is bonded to five equivalent Pm3+ atoms to form a mixture of distorted edge and corner-sharing SePm5 trigonal bipyramids.
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