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Science 18 June 1965:
Vol. 148. no. 3677, pp. 1589 - 1591
DOI: 10.1126/science.148.3677.1589
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Articles

Phase Relations in the System Na2Si2O5-SiO2

J. Williamson 1 and F. P. Glasser 1

1 Department of Chemistry, University of Aberdeen, Old Aberdeen, Scotland

A new compound, Na6Si8O19, is shown to be a thermodynamically stable phase in the Na2O-SiO2 system at 1 atmosphere. The new compound melts incongruently to SiO2 (quartz) and liquid at 808° ± 2°C, and it disproportionates to betaNa2Si2O5 and quartz at 700° ± 10°C.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)