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Solubility Phase Diagram of the Ca(NO<sub>3</sub>)<sub>2</sub>–LiNO<sub>3</sub>–H<sub>2</sub>O System
Abstract
Solubility isotherms of the ternary Ca(NO<sub>3</sub>)<sub>2</sub>–LiNO<sub>3</sub>–H<sub>2</sub>O system were elaborately determined at <i>T</i> = (273.15, 298.15, and 323.15 K) by an isothermal equilibrium method, and the results showed that there are two stable solubility branches for the solid phases Ca(NO<sub>3</sub>)<sub>2</sub>·4H<sub>2</sub>O and LiNO<sub>3</sub>·3H<sub>2</sub>O at 273.15 K, and four stable solubility isotherms for the solid phases Ca(NO<sub>3</sub>)<sub>2</sub>·4H<sub>2</sub>O, Ca(NO<sub>3</sub>)<sub>2</sub>·3H<sub>2</sub>O, LiNO<sub>3</sub>·3H<sub>2</sub>O, and LiNO<sub>3</sub> at 298.15 K, and solubility data corresponding to solid phases Ca(NO<sub>3</sub>)<sub>2</sub>·3H<sub>2</sub>O, Ca(NO<sub>3</sub>)<sub>2</sub>·2H<sub>2</sub>O, and LiNO<sub>3</sub> at 323.15 K. The experimental data were correlated by a modified Brunauer–Emmett–Teller (BET) model to obtain the complete phase diagram of the ternary system over the temperature range from 273 to 373 K. On the basis of the simulated polytherms, an eutectic point Ca(NO<sub>3</sub>)<sub>2</sub>·4H<sub>2</sub>O + LiNO<sub>3</sub>·3H<sub>2</sub>O was recognized, and the melting temperature and fusion heat are 290.5 K and 139.8 J·g<sup>–1</sup>, respectively, measured by differential scanning calorimetrySimilar works
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