ISSN:
0377-0486
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Raman spectra of polycrystalline NH4VO3 and ND4VO3 were recorded at various temperatures. Splittings were observed for most fundamentals and the external mode region contains at least eleven bands. The spectra are interpreted in terms of a group theoretical analysis based on the molecular symmetry and the known crystal structure.Wavenumber vs temperature curves for several internal and external modes show minor anomalies near 150 K, which might be due to an order-disorder phase transition. The bands assigned to ammonium ion librations are observed at room temperature, which implies that the onset of ‘free’ rotation of the NH4+ ion (on the vibrational time scale) occurs at a much higher temperature in NH4VO3 than it does in other ammonium salts.
Additional Material:
15 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jrs.1250201008
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