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The effect of Thermal History on the Morphology of Nickel sulphide

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Abstract

The DSC characterisation of the morphology of the metastable a phase of stoichiometric nickel sulphide was carried out using two calorimeters; a TA Instruments 2920 MDSC and a Perkin Elmer DSC-7, and two quenching histories. Based on these quenching histories, significant differences were observed in the heat flow curves, including the observation of a second exothermic peak which is tentatively assigned to be a metastable phase to metastable phase transformation. The kinetic constants for the a to b recrystallisation were determined as a function of degree of conversion using a mechanism free isoconversional model. Variations in the values of the kinetic constants were also ascribed to the quenching histories. Although the differences in morphology observed were ascribed to the processing history, the shift in the position of the a to b recrystallisation peak was partially attributed to the thermal resistances of the instruments used.

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Authors and Affiliations

  1. Department of Chemistry, Materials and Forensic Sciences, University of Technology, P.O. Box 123, NSW, 2007, Broadway, Sidney, Australia

    P. S. Thomas & A. S. Ray

  2. Department of Physical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37, Bratislava, Slovak Republic

    P. Šimon

Authors
  1. P. S. Thomas
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  2. P. Šimon
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  3. A. S. Ray
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Thomas, P.S., Šimon, P. & Ray, A.S. The effect of Thermal History on the Morphology of Nickel sulphide. Journal of Thermal Analysis and Calorimetry 72, 801–809 (2003). https://doi.org/10.1023/A:1025057929548

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  • DOI: https://doi.org/10.1023/A:1025057929548

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