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Crystallization of a Tetrasilicic Fluormica Glass
Author(s) -
DANIELS W. H.,
MOORE R. E.
Publication year - 1975
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.1151-2916.1975.tb11449.x
Subject(s) - crystallization , mica , materials science , exothermic reaction , amorphous solid , diffraction , x ray crystallography , crystallography , fluorine , ceramic , mineralogy , analytical chemistry (journal) , chemical engineering , chemistry , composite material , optics , metallurgy , chromatography , physics , organic chemistry , engineering
The crystallization of a tetrasilicic synthetic mica glass of nominal composition K 2 Mg 5 Si 8 O 20 F 4 was investigated at selected temperatures from 560° to 1150°C using DTA, density measurements, electron microscopy, and X‐ray diffraction techniques. Crystallization is shown to occur in 2 stages. (1) Initial structural ordering occurs at ∼600°C, as indicated by a strongly exothermic reaction, an increase in density, and the appearance of X‐ray diffraction lines. (This transformation temperature is related to fluorine content.) (2) The crystal morphology of the glass‐ceramic changes at 900° to 1150°C. A mechanism is proposed for the transformation from amorphous to crystalline structure in this synthetic mica system.