THEORETICAL ANALYSIS OF MISCIBILITY GAPS IN THE ALKALI-BORATES.

Abstract

A thermodynamic approach based on the regular solution concept is applied to the description of miscibility gap boundaries in the alkali-borate systems. It is suggested that in each system the structural units which control the entropy of mixing are stoichiometric compounds at the apparent limit of the alkali-rich edge of the gap, and a complex boron trioxide structure. The same boron trioxide complex is used for all the systems analyzed. The physical implications of this analysis are discussed.