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EFFECT OF MAGNESIA AND ALUMINA ON RATE OF CRYSTAL GROWTH IN SOME SODA‐LIME‐SILICA GLASSES *
Author(s) -
Swift Howard R.
Publication year - 1947
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.1151-2916.1947.tb18884.x
Subject(s) - cristobalite , diopside , crystal (programming language) , mineralogy , liquidus , crystal growth , soda lime , crystallization , materials science , wollastonite , phase (matter) , seed crystal , growth rate , crystallography , analytical chemistry (journal) , chemistry , single crystal , metallurgy , quartz , composite material , raw material , chromatography , computer science , programming language , geometry , organic chemistry , mathematics
A bstract Measurements were made of the rates of crystal growth in a series of glasses with 74% SiO 2 , 16% Na 2 O, and 10% (CaO + MgO), the MgO replacing the CaO in 2% steps; and in a series of glasses with 17% Na 2 O, 12% CaO, and 71% (SiO 2 + Al 2 O 3 ), the alumina replacing the silica in 2% steps up to 8% Al 2 O 3 . A study was also made of the rate of crystal solution in the series with variable alumina. The results are explained qualitatively by considering the viscosity and crystallization temperature changes of the glasses as the composition varied. The substitution of MgO for CaO to the composition with the minimum liquidus decreased the maximum rate of crystal growth of cristobalite (primary phase) and devitrite (secondary phase) and further substitutions increased the rate of crystal growth of diopside and Na 2 O·2MgO·6SiO 2 . Substitution of Al 2 O 3 for SiO 2 , decreased the maximum rate of crystal growth of devitrite, and substitutions of more than 4% of Al 2 O 3 increased the rate of crystal growth of wollastonite.