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

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

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

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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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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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