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The Raman spectrum of ammonium metavanadate
Author(s) -
Park Y. S.,
Shurvell H. F.
Publication year - 1989
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250201008
Subject(s) - raman spectroscopy , chemistry , ammonium , ammonium metavanadate , crystallite , ion , wavenumber , crystal (programming language) , crystallography , analytical chemistry (journal) , phase transition , inorganic chemistry , condensed matter physics , physics , vanadium , optics , organic chemistry , programming language , computer science
Abstract Raman spectra of polycrystalline NH 4 VO 3 and ND 4 VO 3 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 NH 4 + ion (on the vibrational time scale) occurs at a much higher temperature in NH 4 VO 3 than it does in other ammonium salts.