Low-temperature heat capacity of heulandite: comparison with clinoptilolite

Low-temperature heat capacity of heulandite Na 0.365K 0.059Ca 0.861Al 2.138Si 6.860O 18·6.17H 2O was measured in an adiabatic vacuum calorimeter. The results obtained were compared with those for heulandite and clinoptilolite from literature. The errors in measurements of the water content are shown...

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Bibliographic Details
Published in:Thermochimica acta 2000-04, Vol.348 (1), p.33-40
Main Authors: Drebushchak, V.A, Naumov, V.N, Nogteva, V.V, Belitsky, I.A, Paukov, I.E
Format: Article
Language:English
Subjects:
Clinoptilolite
Heat capacity
Heulandite
Water content
Zeolites
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Summary:Low-temperature heat capacity of heulandite Na 0.365K 0.059Ca 0.861Al 2.138Si 6.860O 18·6.17H 2O was measured in an adiabatic vacuum calorimeter. The results obtained were compared with those for heulandite and clinoptilolite from literature. The errors in measurements of the water content are shown to be the main reason of discrepancies among the data on heat capacities for the zeolites. The random error can be as high as 1.1%. The greatest systematic error of 2.5% was shown to be in the heat capacities of clinoptilolite. Unusual temperature dependence has been recognized in published data on heat capacity of clinoptilolite, as if free electrons are there in a silicate. Heat capacity of four different species of heulandite–clinoptilolite series are known. However, the data published do not enable one to recognize the relationship between heat capacity and a composition.
ISSN:0040-6031
1872-762X
DOI:10.1016/S0040-6031(99)00453-0