Accession Number : AD0447760

Title :   THE 1010 DEGREES AND 800 DEGREES C ISOTHERMAL SECTIONS IN THE SYSTEM NA3ALF6-AL2O3-SIO,

Corporate Author : CALIFORNIA UNIV BERKELEY

Personal Author(s) : Weill, D. F. ; Fyfe, W. S.

Report Date : 04 APR 1963

Pagination or Media Count : 4

Abstract : Isothermal at 1010 and 800 C were determined in the system Na3AlF6-Al2O30SiO2 by the quenching technique. A determined solubility of 12-15 weight % for corundum in the Na3AlF6-Al2O3 system at 1010 C is in good agreement with recent revisions of that binary melting diagram. The steep nature of the corundum liquidus curve in the Na3AlF6-Al2O3 system is found to continue into the ternary system. Silica solubility which is less than 5% in molten Na3AlF6 at 1010 C increases rapidly with addition of Al2O3 to the system and reaches a maximum value of 69% at the invariant point. The refractive indices of quenched glasses plot smoothly against composition and vary from a maximum of 1.442 (at 17% Na3AlF6) to a minimum of 1.422 (at 50% Na3AlF6). Glasses richer than 50% in Na3AlF6 were difficult to quench. No evidence was found for liquid immiscibility or solid solution in the temperature range studies. (Author)

Descriptors :   (*PHASE STUDIES, CERAMIC MATERIALS), (*CERAMIC MATERIALS, PHASE STUDIES), (*GLASS, PHASE STUDIES), SODIUM COMPOUNDS, ALUMINUM COMPOUNDS, SILICON COMPOUNDS, OXIDES, DIOXIDES, SOLUBILITY, SOLVENTS, MELTING, QUENCHING, REFRACTIVE INDEX, TRANSITION TEMPERATURE, LIQUIDS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE