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Thermophysics and Aeromechanics

2005 year, number 4

Study of phase equilibria and estimates of thermodynamic properties in binary borate systems

A.B. Meshalkin
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Pages: 627-641

Abstract

Phase transitions in binary borate systems were studied by the oscillation method of phase analysis; thermodynamic properties of melts were calculated. Measurements were carried out for several systems: Li2O-B2O3, Na2O-B2O3, K2O-B2O3, Rb2O-B2O3, Cs2O-B2O3, and BaO-B2O3. abstract_eng||The melting temperature was measured accurately, and the types of melt-ing for the systems were specified. The composition of crystallized phase and compounds depends on the thermal prehistrory of samples. The melt viscosity was estimated for all systems. For binary systems in the framework of subregular solution we calculated thermodynamic properties of melts and enthalpy for compounds with congruent melting. There exists a correlation between the dissociation degree of a compound and the melt supercooling before the spontaneous.