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Kinetic analysis of solid-state processes

Published online by Cambridge University Press:  31 January 2011

Jiří Málek*
Affiliation:
Joint Laboratory of Solid State Chemistry, Academy of Sciences of the Czech Republic and University of Pardubice, 532 10 Pardubice, Czech Republic
Takefumi Mitsuhashi
Affiliation:
National Institute for Research in Inorganic Materials, Science and Technology Agency of Japan, Namiki 1–1, Tsukuba, Ibaraki 305, Japan
José Manuel Criado
Affiliation:
Instituto de Ciencia de Materiales de Sevilla, Centro Mixto Universidad de Sevilla-C.S.I.C., c/ Ame’rico Vespucio s/n, 41092 Sevilla, Spain
*
a)Address all correspondence to this author. e-mial: jiri.malek@upce.cz
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Abstract

A simple method for kinetic analysis of solid-state processes has been developed. A criteria capable of classifying different processes is explored here with a view toward visualizing the complexity of solid-state kinetics. They provide a useful tool for the determination of the most suitable kinetic model. The method has been applied to the analysis of crystallization processes in amorphous ZrO2 and RuO2. It is found that the crystallization kinetics of as-prepared sample exhibits a complex behavior under nonisothermal conditions. This is probably due to an overlapping of the nucleation- and crystal-growth processes at the beginning of crystallization. As a consequence, the Johnson–Mehl–Avrami nucleation-growth model cannot be applied. A two-parameter autocatalytic model provides a good description of the crystallization process under isothermal and nonisothermal conditions.

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Copyright
Copyright © Materials Research Society 2001

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