Well-crystallized Rh2S3 and Rh_(17)S_(15) powders with average particle size of 100 nm were solvothermally prepared at 673 K for 10 h with S/Rh ratio of 1.65 and 0.9, respectively. The crys-tallinity and phase of the rhodium sulfides are closely related to the reaction temperature and the S/Rh ratio. By thermal treatment in Ar, the Rh2S3 can be transformed into Rh_(17)S_(15) at 938 K by loss of sulfur.
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