Authors:
Y. Deutsch Geological Survey of Israel, 30 Malchei Israel St., 95501 Jerusalem, Israel

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Y. Nathan Geological Survey of Israel, 30 Malchei Israel St., 95501 Jerusalem, Israel

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S. Sarig Casali Institute, Hebrew University of Jerusalem, Israel

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Abstract  

Study of the gypsum-hemihydrate-soluble anhydrite transitions by thermal, X-ray and IR methods showed differences in the intensity of the ∼3493 cm−1 IR absorption peak of the gypsum samples and differences in the peak ratios of the DTA curve at the gypsum-hemihydrate transition. There were also differences in the temperature and rate of the γ−β anhydrite transition. This suggests that different gypsum species occur, specially among synthetic gypsum. Fifteen equations were tested in order to find models which fitted the gypsum-hemihydrate and the hemihydrate-anhydrite transitions. No model fitted all the samples. The best fit for the gypsum-hemihydrate transition in three samples was an order of reaction equation while for the hemihydrate-anhydrite transition the best fit in four samples was a power law. Differences in crystallite characteristics appear to be one of the main reasons for the differences in kinetics between the samples.

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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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