Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 39, Issue 16, Pages 5410-5422Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.07.044
Keywords
Bioceramics; Mixed Ca-K-Na phosphates; Na and K rhenanites; Phase diagram; Phase transformations
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Funding
- Russian Science Foundation [4-19-00752]
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An investigation of the two-component phase diagram of the CaNaPO4 - CaKPO(4)system performed using various analysis techniques is reported. The continuous solid solution series of alpha-CaMPO4 existing above 700 degrees C undergoes eutectoid decomposition during cooling to beta-CaMPO4-based solid solutions enriched with Na and K, and to an intermediate nonstoichiometric compound with an ideal composition of CaK0.6Na0.4PO4. All three compounds exhibit significant volumetric effects associated with first-order phase transitions, with positive volume changes under cooling for the intermediate compound. Increased K content in ceramics based on CaKyNa1-yPO4 compositions enhances the strength properties of those ceramics, including their fracture toughness, which is associated with increased density. Increased K content also has a smaller effect of inducing phase transformations accompanied by strong volume changes.
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