Abstract
The structure of the presodyme disulfide PrS2 has been determined and refined by the LS method in space group P21/b11(14) with a=4.054(1) Å; b=8.058(1) Å; c=8.079(1) Å and α=90.08(2)° to the final values of discrepancy factors R=0.188; Rw=0.0204. The structure is a derivative structure of the ZrSSi (or PbFCl) structure type. A heringbone pattern of S2 2- dumbbells with interatomic distance 2.135(1) Å is observed in the planes parallel to (001). The investigated crystal has been twinned by pseudomerohedral law, the twin symmetry is mmm and the twinning symmetry elements are (010) and (001) mirror planes.
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