Non-isothermal crystallization kinetics and microstructure evolution of calcium lanthanum metaborate glass
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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Title |
Non-isothermal crystallization kinetics and microstructure evolution
of calcium lanthanum metaborate glass
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Creator |
Biswasa , Kaushik
Sontakkea, Atul D Majumder , M Annapurna, K |
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Subject |
Glass
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Description |
The present paper reports results on the crystallization kinetics of 35.5CaO-7.25La2O3-
57.25B2O3 glass under non-isothermal conditions based on the studies carried out from the
differential thermal analysis upon using various well-established models. The crystalline phases
formed during the optimized ceramization process have been confirmed from the X-ray
diffraction. The activation energies of the first (formation of CaLaB7O13) and second
(formation of LaBO3) crystallization events have been estimated using the conventional
methods of Kissinger, Augis-Bennett, Ozawa and Matusita and the results are found to be in
good agreement with each other. The Avrami exponents that are determined by these models
for the crystallization of CaLaB7O13 and LaBO3 are found to be in the range of (1.81-2.35) and
(4.03-4.65) respectively. This indicates that the formation of CaLaB7O13 is dominated by a
surface crystallization, whereas LaBO3 is formed by three-dimensional bulk crystallization with
an increased rate of nucleation. This observation is further validated by microstructural
investigation, which shows the formation of CaLaB7O13 phase as a surface layer and a bulk
crystallization of LaBO3 in optimally ceramized samples.
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Date |
1999
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Type |
Article
NonPeerReviewed |
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Format |
application/pdf
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Identifier |
http://cgcri.csircentral.net/9/1/KB_journal_of_thermal_analysis_and_cal[1].pdf
Biswasa , Kaushik and Sontakkea, Atul D and Majumder , M and Annapurna, K (1999) Non-isothermal crystallization kinetics and microstructure evolution of calcium lanthanum metaborate glass. Journal of Thermal Analysis and Calorimetry. |
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Relation |
http://cgcri.csircentral.net/9/
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