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Phase Relations in the System Na 2 Si 2 O 5 -SiO 2

1965; American Association for the Advancement of Science; Volume: 148; Issue: 3677 Linguagem: Inglês

10.1126/science.148.3677.1589

1095-9203

John J. Williamson, F. P. Glasser,

Zeolite Catalysis and Synthesis

A new compound, Na 6 Si 8 O 19 , is shown to be a thermodynamically stable phase in the Na 2 O-SiO 2 system at 1 atmosphere. The new compound melts incongruently to SiO 2 (quartz) and liquid at 808° ± 2°C, and it disproportionates to βNa 2 Si 2 O 5 and quartz at 700° ± 10°C.