Raman spectroscopic studies of the thermal decomposition mechanism of ammonium metavanadate
- 1 January 1997
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 7 (11) , 2273-2277
- https://doi.org/10.1039/a702968c
Abstract
Thermal decomposition of NH4VO3 under N2 and NH3+ H2O has been studied on a molecular level by in situ Raman spectroscopy in the temperature range 150–400 °C. Under N2 , the decomposition mechanism leading to formation of V2O5 has been observed to proceed via two intermediates: viz. an amorphous, transitional (NH4)2V4O11 and NH4V3O8 . Under NH3+H2O, a slightly different decomposition pathway, rationalized in terms of stability of intermediates, leading to the formation of V2O3 has been observed. The identification of Raman-inactive V2O3 is further supported by the formation of V2O4and V2O5 , along with monomeric vanadyl species, through oxidation of V2O3 at 400 °C.Keywords
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