Phase and Physicochemical Properties Diagrams of Quaternary System Li2B4O7 + Na2B4O7 + Mg2B6O11 + H2O

Abstract

The phase and physicochemical properties diagrams of the quaternary system (Li₂B₄O₇ + Na₂B₄O₇ + Mg₂B₆O₁₁) at 288.15 K and 0.1 MPa were constructed using the solubilities, densities, and refractive indices measured. In the phase diagrams of the system there are one invariant point, three univariant isothermic dissolution curves, and three crystallization regions corresponding to Li₂B₄O₇ · 3H₂O, Na₂B₄O₇ · 10H₂O, and Mg₂B₆O₁₁ · 15H₂O, respectively. The solution density, refractive index of the quaternary system changes regularly with the increasing of Li₂B₄O₇ concentration. The calculated values of density and refractive index using empirical equations of the quaternary system are in good agreement with the experimental values.