Non-isothermal crystallization kinetics of La2CaB10O19 from glass |
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| Authors: | I Dyamant E Korin |
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| Institution: | a Zandman Center for Thick-Film Microelectronics, Ben-Gurion University of the Negev, P. O. Box 653, Beer-Sheva 84105, Israelb Department of Chemical Engineering, Ben-Gurion University of the Negev, P. O. Box 653, Beer-Sheva 84105, Israelc Department of Chemistry, Ben-Gurion University of the Negev, P. O. Box 653, Beer-Sheva 84105, Israel |
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| Abstract: | The non-isothermal crystallization kinetics of La2CaB10O19 (LCB) from a La2O3-CaO-B2O3 glass was studied. Differential thermal analysis methods were performed on three glass powders to obtain the kinetic parameters of LCB crystallization mechanism. The activation energies for overall crystallization (E), obtained by the methods of Kissinger and Ozawa, were in the range of 479-569 kJ/mol. Multiple (five) analysis methods were used to estimate the Avrami exponent (n), which could consequently be reduced into the single value of n = 3.1 ± 0.3. The growth morphology index (m) of LCB was corroborated by microscopy (optical and electron) images, which revealed a three dimensional growth. Energy dispersive spectroscopy confirmed that LCB is the crystallizing phase from the glass by an interface controlled mechanism. The parameters of the Johnson-Mehl-Avrami kinetic model for the analysis of LCB crystallization from glass were found to be n = m = 3. |
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| Keywords: | Crystallization kinetics La2CaB10O19 Avrami exponent Differential thermal analysis Glass crystallization |
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