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  • 1 Polish Academy of Sciences Institute of Catalysis and Surface Chemistry Niezapominajek 30-239 Kraków Poland Niezapominajek 30-239 Kraków Poland
  • | 2 Academy of Mining and Metallurgy Department of Materials Science, and Ceramics Mickiewicza 30 30-059 Kraków Poland Mickiewicza 30 30-059 Kraków Poland
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The thermal behaviour of H4SiW12O4024.8H2O (SiW12) was investigated by using DTA, TG and FTIR. Endothermic effects were observed at 40, 98 and 217C, corresponding to the fusion of SiW12 in its own crystallization water, boiling of the solution and decomposition of the remaining tetrahydrate into anhydrous SiW12, respectively. The mass of the sample remained constant on heating from about 250 to 400C. Subsequently, it slowly decreased and reached a constant value at about 500C. At 526C a DTA peak appeared. There was an abrupt change in the FTIR spectrum of the sample heated to 550C. The typical spectrum of the Keggin unit vanished and new bands at 807.5 and 1030 cm−1 indicated the presence of free WO3 and SiO2, respectively.

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
per Year
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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)

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