Phys. Rev. B 64, 092302 (2001) [4 pages]A Raman scattering study of the antiferroelectric phase transition in (Sr0.70Ca0.30)TiO3 |
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Sanjay Kumar Mishra, Rajeev Ranjan, and Dhananjai Pandey
School of Materials Science and Technology, Institute of Technology, Banaras Hindu University, Varanasi 221005, India
R. Ouillon, J.-P. Pinan-Lucarre, P. Ranson, and Ph. Pruzan
Physique des milieux condenses, UMR 7602, Universite Pierre et Marie Curie, B77, 4 Place Jussieu, 75252 Paris, Cedex 05, France
Received 2 March 2001; published 10 August 2001
The Raman scattering measurements on ceramic pellets of Sr0.70Ca0.30TiO3 (SCT 30) have been carried out as a function of temperature from 290 K to 8 K. It is shown that below (236±5 K), two additional lines appear around 79 and 128 cm-1. Further, there is enhancement in the intensity of the modes near 170 and 541 cm-1 below (236±5 K). The temperature at which these changes occur in the Raman spectra of SCT 30 correlates very well with the temperature at which the antiferroelectric superlattice reflections appear in the x-ray diffraction patterns. We propose that the additional modes are due to q≠0 phonons that have become Raman active due to the folding of the corresponding special points into the zone center below the cell-doubling antiferroelectric phase-transition temperature.
©2001 The American Physical Society
URL: http://link.aps.org/abstract/PRB/v64/e092302
DOI: 10.1103/PhysRevB.64.092302
PACS: 78.30.-j, 77.84.Dy
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