Authors:
I. Nerád Institute of Inorganic Chemistry, Centre for Chemical Research Slovak Academy of Sciences CS-842 36 Bratislava Czechoslovakia

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S. Vitková Institute of Inorganic Chemistry, Centre for Chemical Research Slovak Academy of Sciences CS-842 36 Bratislava Czechoslovakia

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I. Proks Institute of Inorganic Chemistry, Centre for Chemical Research Slovak Academy of Sciences CS-842 36 Bratislava Czechoslovakia

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A static method is described for measurement of the equilibrium values of temperature, pressure and composition of the solid phase, and determination of the number of degrees of freedom in heterogeneous systems containing a gaseous phase, including water vapour. With this method, it has been found that in the system formed in the thermal dehydration of CaC2O4·H2O a solid solution of monohydrate and anhydride coexists in equilibrium with water vapour. The composition of the solid solution changes with the temperature and the pressure of water vapour. The dehydration enthalpy of the solid solution referred to 1 mol H2O does not depend on its composition. It was found to be ΔHdeh=(69+-3) kJ·mol−1.

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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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