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Praseodymium sulphide, Pr2S3

Praseodymium sulphide, Pr2S3, cannot be prepared by the usual methods, if entirely free from cerium; the sulphate, when heated in hydrogen sulphide, giving only praseodymium oxysulphide, Pr2O2S. If, however, the praseodymium sulphate contains a little cerous sulphate, the trisulphide, Pr2S3, and persulphide, Pr2S4, may be obtained as in the cases of cerium and lanthanum. The trisulphide is chocolate-brown in colour and has a density of 5.042 at 11° (Muthmann and Stutzel). The persulphide begins to lose sulphur at about 650°.

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