Abstract
The limits of miscibility within a portion of the system Na2O‐ZnO‐B2O3‐SiO2 were determined at 650°, 800°, and 950°C. The miscibility gap at 800° and 950°C is a low dome, adjoining the zinc borosilicate miscibility gap. Below 755°C the dome intersects the Na2O‐B2O3‐SiO2 face of the phase diagram. The locus of this intersection is in agreement with literature data on the sodium borosilicate system. Estimated tie‐line placement in the ZnO‐B2O3‐SiO2 miscibility gap at 1300°C resembles those reported for the corresponding CaO and SrO systems. The microscopic morphology of glasses with the weight composition xNa2O‐18ZnO‐18B2O3‐64SiO2 with 0≤×≤12 is described in detail.
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