Crystallization kinetics determination of Pb15ge27se58 chalcogenide glass by using the various heating rates (VHR) Method
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 cryst...
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| Format: | Article |
| Published: |
2010
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| Online Access: | http://eprints.um.edu.my/5316/ http://ac.els-cdn.com/S0022309309006905/1-s2.0-S0022309309006905-main.pdf?_tid=71bf72fc-2ca9-11e2-9d73-00000aacb361&acdnat=1352711884_3f1ef0f8b647139ff47de017218aa3bd |
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| Summary: | 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. |
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