Structure of a New Intermediate Lu2+xS3 Phase.

Abstract A new intermediate phase in the Lu-S system, Lu 2 + x S 3 , between the sulfur-rich end of the monosulfide homogeneity range and Lu 2 S 3 was found to be isostructural with Sc 2 S 3 . The structure of Lu 2 + x S 3 is based upon the NaCl-type with a 12 times larger orthorhombic unit cell due to ordering on the vacant lutetium sites, and with ordered vacancies that differentiate it from Sc 2 S 3 .