The ternary system Na₂O-ZnO-SiO₂

Abstract

The equilibrium relationships in a large part of the system Na₂O-ZnO-SiO₂ have been determined. Of the eleven invariant points located, four are eutectics, the minimum melting point in the system being 680º at a composition of 21.5% Na₂O, 12.0% ZnO, 66.5% SiO₂ by weight. Four ternary compounds with molar ratios of Na₂O : ZnO : SiO₂ of 1 : 1 : 1, 1 : 1 : 2, 1 : 2 : 2, 2 : 2 : 3, all with incongruent melting points, are described.