Dilawar, Nita and Chandra, Usha and Parthasarathy, G. and Bandyopadhyay, A. K. (2008) Study of high-pressure-induced phase transition in nanocrystalline perovskite (LaSr)(MnFe)O-3 by Raman spectroscopy. Journal of Raman Spectroscopy , 39 (12). pp. 1765-1771. ISSN 0377-0486

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We report here high-pressure-induced phase transitions observed in nanocrystalline perovskite (La0.8Sr0.2Mn0.8Fe0.19Fe0.01O3)-Fe-57 as a function of pressure up to 9.2 GPa at room temperature by Raman spectroscopy. The nanocrystalline sample, synthesized by the sol-gel technique showed crystallite sizes of similar to 140 angstrom. The peaks originated as a consequence of the nano size of the sample as well as the Fe doping, reported for the first time in these manganites, could be identified and seem to be affected strongly by the application of pressure. Phonon softening observed in MnO6 octahedra indicated structural instabilities with pressure and could be correlated to the Mossbauer parameter-quadrupole splitting. The results tally very well with those of high-pressure Mossbauer spectroscopy and electrical resistivity measurements.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s John Wiley & Sons.
Subjects: Spectroscopy
Depositing User: Ms Neetu Chandra
Date Deposited: 18 Apr 2017 08:12
Last Modified: 18 Apr 2017 08:12
URI: http://npl.csircentral.net/id/eprint/2115

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