Аннотация:Phase equilibria in the quasi-binary section CaNaPO4 - CaKPO4 (M = Na, K) is distinguished by high-temperature isomorphism of glaserite like phases α'-Ca3(PO4)2 and α-CaMPO4 (M=Na, K). Solid solution CaNa1-xKxPO4 with glaserite type structure is stable at room temperature with wide field of existence (x=0.45-0.75). First-order phase transition of this intermediate solid solution bears ferroelastic character with negative volume effect during heating. Alkaline nitrates can be used as mineralizers for phase equilibria study in the CaNaPO4 – CaKPO4 system.
Keywords: phase diagram, thermal analysis, mineralizer, bioceramics, double calcium and alkaline phosphates, rhenanite.