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 have been determined. The compounds have been examined by x-ray phase analysis, infrared spectroscopy, and diffuse reflection spectroscopy. The conductivity and optical properties of the compounds MMoO2(PO4) (M=Li, Na, K) have been determined. The coordinates of the liquidus lines have been used to calculate the activities of the components in the MPO3 — MoO3 systems. Those activities show large negative deviations from ideal solutions. This indicates strong interaction between particles in the liquid state.