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Raman spectroscopic studies on sodium metavanadate

Seetharaman, S and Bhat, HL and Narayanan, PS (1983) Raman spectroscopic studies on sodium metavanadate. In: Journal of Raman Spectroscopy, 14 (6). pp. 401-405.

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Abstract

Sodium metavanadate $(NaVO_3)$ has been reported earlier to exhibit ferroelectric behaviour below 380°C, but unlike many other known ferroelectrics it does not show a very strong dielectric anomaly, indicating that the structural change during the ferroelectric phase transition may be only a slight modification of the paraelectric phase. This is in conformity with the x-ray data at room temperature, which could be refined to the same R value either in space group C2/c or Cc. Further, it is known that $NaVO_3$ occurs also in another polymorphic modification (\beta -form), the structure of which has not been established. Raman spectroscopic studies of single crystals of the \alpha -form of $NaVO_3$ have been carried out and a crystalline powder of the \beta -form has been made. The Raman spectra have been interpreted in terms of the linear $VO^-_3$ chains formed by $VO_4$ tetrahedra sharing two corners with each other. The temperature variation of the intensity and width of the Raman lines through the phase transition has been measured and the observed LO-TO splitting in the room temperature phase confirm the Ce ferroelectric space group.

Item Type: Journal Article
Additional Information: The copyright belongs to John Wiley & Sons, Ltd.
Keywords: raman spectroscopy;sodium metavanadate;ferroelectric;room temperature
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 21 Sep 2005
Last Modified: 27 Aug 2008 11:28
URI: http://eprints.iisc.ernet.in/id/eprint/3676

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