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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Sodium metavanadate $(NaVO_3)$ has been reported earlier to exhibit ferroelectric behaviour below 380ÃÂðC, 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 |
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Publication: | Journal of Raman Spectroscopy |
Publisher: | John Wiley & Sons, Ltd. |
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.ac.in/id/eprint/3676 |
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