A pseudo-isothermal kinetic analysis of the recrystallisation of nickel sulphide measured by non-isothermal DSC

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Journal Article
Journal of Thermal Analysis and Calorimetry, 2005, 80 (1), pp. 77 - 80
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A pseudo-isothermal method for the kinetic analysis was applied to the recrystallisation of α to β nickel sulphide based on the Ozawa model for non-isothermal crystallisation in the presence of pre-existing nuclei. The aim of the analysis was to determine the number of steps involved in the recrystallisation and, hence, determine the applicability of the kinetic equation based on a single step mechanism, as is commonly applied in the kinetic analysis of solid-state processes using thermal methods. The kinetic analysis yielded evidence of at least two processes indicating that physical and mechanistic significance should not be drawn from the use of a single step approximation of the rate equation. © 2005 Akadémiai Kiadó, Budapest.
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