Authors:
C. A. Strydom Department of Chemistry University of Pretoria 0002 Pretoria South Africa

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D. de Waal Department of Chemistry University of Pretoria 0002 Pretoria South Africa

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The compound, (NH4)[VO(O2)2(NH3)], thermally decomposes to ammonium metavanadate, which then decomposes to vanadium pentoxide. Using a heating rate of 5 deg·min−1, the first decomposition step occurs between 74° and 102°C. The transformation degree dependence of the activation energy (α-E) is shown to follow a decreasing convex form, indicating that the first decomposition step is a complex reaction with a change in the limiting stage of the reaction. Infrared spectra indicated that the decomposition proceeds via the gradual reduction of the ratio of the ‘(NH4)2O’ to ‘V2O5’ units from the original 1∶1 ratio in ammonium metavanadate, which may be written as (NH4)2O·V2O5, to V2O5.

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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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