Experimental Study of the High-Temperature Region of the Ca3(PO4)2–CaKPO4–CaNaPO4 System

• Published in: Russian Journal of Physical Chemistry A Vol. 95; no. 7; pp. 1302 - 1306
• Main Authors: Orlov, N. K., Kiseleva, A. K., Milkin, P. A., Evdokimov, P. V., Putlayev, V. I., Liu, Yaxiong
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 2021; Springer Nature B.V
• Subjects: Calcium phosphates; Chemical Thermodynamics and Thermochemistry; Chemistry; Chemistry and Materials Science; Composition; High temperature; Low temperature; Phase diagrams; Physical Chemistry; phase transformations; sodium and potassium; mixed phosphates of calcium; phase diagrams of ternary systems
• ISSN: 0036-0244; 1531-863X
• DOI: 10.1134/S0036024421070190

An experimental study is performed of the high-temperature region of the phase diagram of the Ca
3
(PO
4
)
2
–CaNaPO
4
–CaKPO
4
system. The compositions of the phase fields at 1200°C are determined. It is shown that the region of tricalcium composition at the given temperature consists of two single-phase regions: high-temperature α-Ca
3
(PO
4
)
2
and low-temperature β-Ca
3
(PO
4
)
2
. The upper temperatures of the existence of fields of the phase triangle section at 1200°C are determined.