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The structure of the presodyme disulfide PrS 2  has been determined and refined by the LS method in space group P2 1 /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 S 2  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 mmm and the twinning symmetry elements are (010) and (001) mirror planes.

Contribution to the crystal chemistry of rare-earth chalcogenides. II The crystal structure and twinning of rare-earth diusulfide PrS 2