On the miscibility gap in monazite-xenotime systems

The regular solid solution model has been applied to solid solubility in the monazite-xenotime systems and is verified against the available experimental data for LaPO4-YPO4 and CePO4-YPO4 systems. The model is then used to predict the miscibility gaps in a number of other monazite-xenotime systems. The implications for prospective two-phase monazite-xenotime fiber coatings for applications in ceramic matrix composites (CMCs) are discussed.