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  • 1 Hiroshima University Chemistry Laboratory, Faculty of School Education 3-1-33 Shinonome, Minami-ku 734 Hiroshima Japan
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Thermoanalytical (TA) and hot-stage microscopic techniques were employed to investigate the complicated behaviour of the non-isothermal dehydration of single crystals of α-NiSO4·6H2O. Non-isothermal dehydration to the tetrahydrate proceeds in two stages: (1) surface nucleation and growth of nuclei, followed by advancement of reaction fronts inward; (2) random nucleation and growth near the reaction front as well as in the bulk. Corresponding TA curves were interpreted to represent diffusional removal of evolved water vapour through the surface layer created in stage (1). The dehydration process of the tetrahydrate to the monohydrate is explained on the basis of textural structures produced in the previous step. Crack formation in the surface layer and rapid escape of the water vapour were observed in this step.

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