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Crystallization Mechanisms in Glass‐Ceramics
Author(s) -
LEWIS M. H.,
METCALFJOHANSEN J.,
BELL P. S.
Publication year - 1979
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.1151-2916.1979.tb09481.x
Subject(s) - crystallization , crystallite , materials science , equiaxed crystals , electron microprobe , transmission electron microscopy , phase (matter) , crystallography , mineralogy , impurity , crystal (programming language) , crystal growth , quartz , analytical chemistry (journal) , chemical engineering , microstructure , chemistry , metallurgy , nanotechnology , organic chemistry , chromatography , computer science , engineering , programming language
Transmission electron microscopy, electron diffraction, and microprobe X‐ray analysis were used to study crystallization of glasses in the systems Li 2 O‐SiO 2 , BaO‐SiO 2 , and Li 2 O‐A1 2 O 3 ‐SO 2 . The ternary system, with 4 mol% TiO 2 added to an Li 2 O‐Al 2 O 3 ‐4SiO 2 composition, crystallizes with a simple morphology of equiaxed grains of the β‐quartz metastable phase which transforms at higher temperatures to the stable β‐spodumene structure. The binary systems exhibit a more complex crystallization morphology dictated by crystal anisotropy, temperature, impurity content, and susceptibility either to intermediate‐phase formation (BaO‐SiO 2 ) or to liquid immiscibility (Li 2 O‐SiO 2 ). The initial crystal growth units formed in these systems are frequently two‐phase branched morphologies many micrometers in diameter. They may be recrystallized to form polycrystalline glass‐ceramics with submicrometer grain sizes.