ON THE PHASE-RELATIONS IN THE MO-CA-S, S-MO-O AND CA-S-O SYSTEMS AT 1373-K

Phase equilibria in the MoCaS, SMoO and CaSO systems have been revealed by X-ray powder diffractometry. The sole ternary phase, previously known as CaMo6S8 (Chevrel type), has been identified. Experiments with arcsealed molybdenum crucibles have not confirmed the theoretical predictions of the existence of equilibrated phases in the MoCa system. The existence of the CaO0.99S0.01 solid solution in the CaSO system has been established. A gravimetric method for calcium determination is presented. © 1990.