El-Raheem, M.M.A. and Ali, Hapipah Mohd (2010) Crystallization kinetics determination of Pb15ge27se58 chalcogenide glass by using the various heating rates (VHR) Method. Journal of Non-Crystalline Solids, 356 (2). pp. 77-82. ISSN 0022-3093, DOI https://doi.org/10.1016/j.jnoncrysol.2009.10.010.
Full text not available from this repository.Abstract
The kinetics of crystallization of Pb15Ge27Se58 was studied by differential scanning calorimetry non-isothermally. Various experimental methods are currently employed for determining the kinetic parameters of crystallization in a glassy system. These parameters include the activation energy of crystallization E (kJ/mol), the kinetic exponent n and the frequency factor K-o (s(-1)). Recently, a new method (VHR method) has been derived from Johnson-Mehl-Avrami (JMA) transformation rate equation to calculate - in sequence - the crystallization kinetic parameters of a glassy system. The VHR technique has been used to estimate the crystallization parameters of Pb15Ge27Se58 chalcogenide glass under non-isothermal conditions. The average value of E, n and K-o are found equal to 181.74 +/- 0.58 (kJ/mol), 1.085 +/- 0.023 and (9.196 +/- 0.716) x 10(12) (s(-1)), respectively. The kinetic exponent, n approximate to 1 indicates a surface nucleation mechanism. (C) 2009 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Funders: | UNSPECIFIED |
| Additional Information: | Department of Chemistry, Faculty of Science Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA |
| Subjects: | Q Science > QD Chemistry |
| Divisions: | Faculty of Science > Department of Chemistry |
| Depositing User: | Miss Malisa Diana |
| Date Deposited: | 03 Apr 2013 03:46 |
| Last Modified: | 29 Jan 2019 09:12 |
| URI: | http://eprints.um.edu.my/id/eprint/5316 |
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