Abstract
The phase diagrams of the ternary reciprocal systems Na,K||BO2,CO3 and Na,K||BO2,Cl were studied for the first time by a calculation-experimental method and by differential thermal analysis. Analytical models of phase equilibrium states were derived, and the coordinates of eutectics were found to be (680°C, 32 mol % NaBO2, 68 mol % KCl) and (648°C, 9 mol % NaBO2, 45.5 mol % NaCl, 45.5 mol % KCl). Binary solid solutions based on metaborates and carbonates of sodium and potassium were shown to be stable. The possibility of synthesizing tungsten oxide bronzes in a eutectic melt in the ternary system NaBO2–NaCl–КCl was revealed.
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