Two heating rates as a method for calculating the kinetic parameters of crystallization in a glassy system

✍ Scribed by Rasheedy, M. S.

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 117 KB
• Volume: 202
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200520066

✦ Synopsis

Abstract

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)