Abstract
Phase relations in high-temperature solutions of the M 2 I O-P2O5-Fe2O3-CaO(CaF2) (MI = Na, K) systems (M 2 I O/P2O5 = 0.7, 1.0, 1.3; Ca/P = 0.3; Ca/Fe = 1.0; Δt = 1000–680°C) have been studied. The nature of the calcium precursor has been shown to influence the phase relations in the multicomponent alkali metal phosphate high-temperature solutions. The synthesized compounds have been characterized by X-ray powder diffraction and IR spectroscopy, and the crystal structure of the new phosphate Na2.5CaFe1.5(PO4)3 has been determined by single-crystal X-ray structure analysis.
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