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Two heating rates as a method for calculating the kinetic parameters of crystallization in a glassy system
Author(s) -
Rasheedy M. S.
Publication year - 2005
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200520066
Subject(s) - crystallization , thermodynamics , activation energy , kinetic energy , work (physics) , isothermal process , exponent , annealing (glass) , frequency factor , materials science , order of reaction , homogeneous , kinetics , chemistry , physics , reaction rate constant , classical mechanics , linguistics , philosophy
Various experimental methods are currently employed for determining the kinetic parameters of crystallization in a glassy system. These parameters include the activation energy E (kJ/mol), the Avrami exponent or the reaction order ( n ) and the frequency factor K 0 (s –1 ). In the present work, a new method is derived from Johnson–Mehl–Avrami (JMA) equation to calculate the kinetic parameters of crystallization. The method starts with determining the activation energy E . The method depends on obtaining the same vol‐ume fraction of crystallization x ( t ) at two heating rates. Next, the reaction order n and the frequency factor K 0 are determined successively. The present method is straightforward and involves no assumptions in addition to those involved in obtaining JMA equation. The new technique has successfully predicted the crystallization parameters of Ge 10 Te 35 As 55 glasses during non‐isothermal annealing. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)