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Crystallization Kinetics for Synthesis Hyper-Structure in P2O5-ZnO-B2O3-BaO-Al2O3-TiO2 Glass Ceramic Composite

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Abstract:

The nucleation and crystallization kinetics of P2O5-B2O3-ZnO-BaO-Al2O3-TiO2 crystals in bulk glass in which this crystals were found to crystallize in the heating process of the glass, were studied by non-isothermal measurements using differential thermal analysis (DTA). A nucleation rate-temperature was determined by plotting either the reciprocal of the temperature corresponding to the crystallization peak maximum, 1/Tp, or the height of the crystallization peak, (*T)p, as a function of nucleation temperature, Tn. The temperature where nucleation can occur for this glass ranges from 700°C to 890°C and the temperature for maximum nucleation is 760±5°C. The correct activation energy for crystallization, Ec, for this glass is the same for surface and/or bulk crystallization, and is 533±15°CkJ/mol. The analysis of the crystallization data with the Kissinger equation and the Marotta equation yields the correct value for Ec only crystal growth occurs on a fixed number of nuclei. The crystallization process of a sample heat treated at the temperature of the maximum nucleation rate was fitted to kinetic equations with an Avrami constant, n ≈2 and a dimensionality of crystal growth, m ≈2.

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Periodical:

Materials Science Forum (Volume 569)

Pages:

153-156

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.569.153

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Online since:

January 2008

Authors:

Young Seok Kim, Kyu Ho Lee, Tae Ho Kim, Young Joon Jung, S. H. Yim, Bong Ki Ryu

Keywords:

Crystallization Kinetics, Glas Ceramics, Phosphate Glass, Surface Nucleation

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© 2008 Trans Tech Publications Ltd. All Rights Reserved

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