Liquid Immiscibility in the System Na2O-ZnO-B2O3-SiO2 |
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| Authors: | PETER TAYLOR&#; DERREK G OWEN |
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| Affiliation: | Research Chemistry Branch, Whiteshell Nuclear Research Establishment, Atomic Energy of Canada Limited, Pinawa, Manitoba R0E 1L0 |
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| 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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