Аннотация
The Mg(CH 3 CH 2 COO) 2 -H 3 BO 3 -H 2 O section of the MgO-B 2 O 3 -C 6 H 10 O 3 -H 2 O quaternary system was studied at 50 and 60°C using the isothermal solubility method and measurements of the density, pH, and refractive index of saturated solutions. A chemical reaction with the formation of MgB 4 O 7 · 7H 2 O and MgB 6 O 10 · 8H 2 O was established to proceed in the system. The identity of precipitated solid phases was confirmed by chemical analysis, derivatography, and IR spectroscopy.