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Kinetics of Dendritic Precipitation of Cristobalite from a Potassium Silicate Melt
Author(s) -
CHRISTENSEN N. H.,
COOPER A. R.,
RAWAL B. S.
Publication year - 1973
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.1151-2916.1973.tb12415.x
Subject(s) - cristobalite , kinetics , electron microprobe , potassium silicate , precipitation , silicate , reaction rate constant , phase (matter) , microprobe , mineralogy , materials science , nucleation , optical microscope , chemical engineering , chemistry , thermodynamics , scanning electron microscope , metallurgy , composite material , physics , quartz , quantum mechanics , meteorology , engineering , organic chemistry
The growth of cristobalite precipitates in a 15 wt% K 2 O‐SiO 2 melt at 770° and 810°C was studied using the optical microscope and electron microprobe. A two‐phase layer of dendritic crystals and interstitial melt grew from the surface at a constant rate determined by the chemical interdiffusion coefficient. This mechanism is consistent with most previous results concerning the kinetics of precipitate growth in glass‐forming systems. It is evident that the tendency to associate constant growth rate with kinetics controlled by a phase‐boundary reaction cannot in general be justified.