Various heating rates (VHR) as a method for crystallization kinetics determination and its application to Se75.5Te20Sb4.5 chalcogenide glass
作者： M.S. Rasheedy , A.S. Soltan , A.A.I. Abd-Elmageed
DOI: 10.1016/J.JALLCOM.2008.05.025
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摘要: Abstract A new method (VHR method) has been derived from Johnson–Mehl–Avrami (JMA) transformation rate equation to calculate the crystallization kinetic parameters of a glassy system. These include activation energy E (kJ/mol), exponent n and frequency factor Ko (s−1). The VHR starts with obtaining E. Let us consider xi(t) as volume fractions which are obtained at various heating rates βi (K/min). for depends on finding temperatures Ti (K) times ti (s) required produce same values βi. Next, value is by using T1 T2 t1 t2 extracted two different fraction x1(t) x2(t) rate. Finally, may be any x(t) after n, successively. applicability full descriptions have thoroughly tested computer simulated curves. Also, validity checked in cases being temperature-independent temperature-dependent parameter. technique used estimate Se75.5Te20Sb4.5 chalcogenide glass under non-isothermal conditions.
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