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Journal. Effects of Composition Changes on the Crystallization Behavior of MgO‐CaO‐SiO 2 ‐P 2 O 5 Glass‐Ceramics
Author(s) -
Shyu JiinJyh,
Wu JennMing
Publication year - 1991
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.1151-2916.1991.tb08270.x
Subject(s) - eutectic system , nucleation , crystallization , composition (language) , materials science , mineralogy , chemical composition , apatite , ceramic , glass ceramic , differential thermal analysis , chemical engineering , diffraction , thermodynamics , chemistry , metallurgy , microstructure , optics , linguistics , physics , philosophy , engineering
The effects of composition changes on the crystallization behavior of apatite‐containing glass‐ceramics in the system MgO‐CaO–SiO 2 –P 2 O 5 were studied. The eutectic composition of 40 wt% 3CaO‐P 2 O 5 –60 wt% CaO MgO 2SiO 2 was selected as the base glass. Several parameters were quantitatively or qualitatively derived from thermal analysis, X‐ray diffraction, and microstructural observations. These parameters can be divided into two groups according to their variation with glass composition. The parameters in the first group depend mainly on the apatite nucleation rate, which increases with an increase in CaO or PiO 5 , and with a decrease in MgO or SiO 2 . The parameters in the second group are closely related to the extent of deviation of the glass composition from the eutectic. The classical theory for nucleation employed to explain the observed phenomena is discussed.