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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
 
Creator Biswasa , Kaushik
Sontakkea, Atul D
Majumder , M
Annapurna, K
 
Subject Glass
 
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.
 
Date 1999
 
Type Article
NonPeerReviewed
 
Format application/pdf
 
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.
 
Relation http://cgcri.csircentral.net/9/