Abstract
Phase equilibria in the Li 2CrO 4CaCrO 4 system were determined by differential thermal analysis and X-ray powder diffraction. The phase diagram is characterized by a eutectic reaction at 489°C and 5 mole% CaCrO 4, and a monotectic reaction at 570°C and 80 mole% CaCrO 4. The solubility of Li 2CrO 4 in CaCrO 4 was ≈15 mole% at the eutectic temperature and declined to <5 mole% at the monotectic temperature. No double salt was formed between the end members. The immiscibility observed in the system is rationalized in terms of the cation coordination polyhedra. Thermal events indicative of a solid state phase change in Li 2CrO 4 as reported in some references are judged to be the result of a Li 2CO 3 impurity.
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