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HIGH‐TEMPERATURE VISCOSITIES OF SODA‐SILICA GLASSES *
Author(s) -
Lillie H. R.
Publication year - 1939
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1939.tb19482.x
Subject(s) - shearing (physics) , mineralogy , viscosity , thermodynamics , materials science , analytical chemistry (journal) , chemistry , composite material , chromatography , physics
A bstract A careful study of the viscosities of glasses composed of silica and between 22 and 40% soda shows that viscosity‐composition isotherms are smooth curves. The sharp minima at about 34% Na 2 O (and possibly at about 26% Na 2 O) observed by Preston 1 are found to be entirely absent. Neither time nor shearing stress has any effect upon observed viscosities in the region investigated as long as temperature constancy has been established. A study of deviations, i.e ., of individual points from the smooth isotherms, shows that these are all within the expected limits of experimental error.