Interactions in the LiPO3-MoO3, NaPO3-MoO3, and KPO3-MoO3 systems

The MPO3 - MoO3 (M = Li, Na, K) pseudobinary systems have been examined by differential thermal analysis and x-ray phase analysis. The phase diagrams have been derived, and the temperatures and compositions of the eutectics h ave been determined. The compounds have been examined by x-ray phase analys is, infrared spectroscopy, and diffuse reflection spectroscopy. The conduct ivity and optical properties of the compounds MMoO2(PO4) (M = Li, Na, K) ha ve been determined. The coordinates of the liquidus lines have been used to calculate the activities of the components in the MPO3 - MoO3 systems. Tho se activities show large negative deviations from ideal solutions. This ind icates strong interaction between particles in the liquid state.