Phase equilibria in the tricalcium phosphate-mixed calcium sodium (potassium) phosphate systems |
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| Authors: | P. V. Evdokimov V. I. Putlyaev V. K. Ivanov A. P. Garshev T. B. Shatalova N. K. Orlov E. S. Klimashina T. V. Safronova |
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| Affiliation: | 1. Lomonosov Moscow State University, Leninskie Gory, Moscow, 119991, Russia
2. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia
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| Abstract: | Phase equilibria in the quasi-binary sections Ca3(PO4)2-CaMPO4 (M = Na, K) are distinguished by high-temperature isomorphism of glaserite-like phases α’-Ca3(PO4)2 and α-CaMPO4. The main differences of the Ca3(PO4)2-CaKPO4 system from the Ca3(PO4)2-CaNaPO4 system are a shift of invariant equilibria toward higher temperatures, deceleration of phase transformations, and the emergence of polymorphism of an intermediate phase of an ordered solid solution based on α-CaKPO4. The low-temperature modification of this phase of a composition near Ca8K2(PO4)6 has the apatite structure with unoccupied hexagonal channels. |
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