Mishra, Sanjay Kumar ; Ranjan, Rajeev ; Pandey, Dhananjai ; Ouillon, R. ; Pinan-Lucarre, J. -P. ; Ranson, P. ; Pruzan, Ph. (2001) A Raman scattering study of the antiferroelectric phase transition in (Sr0.70Ca0.30)TiO3 Physical Review B, 64 (9). 092302_1-092302_4. ISSN 1098-0121
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Official URL: http://link.aps.org/doi/10.1103/PhysRevB.64.092302
Related URL: http://dx.doi.org/10.1103/PhysRevB.64.092302
Abstract
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±5K), 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±5K). 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.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Physical Society. |
| ID Code: | 27239 |
| Deposited On: | 10 Dec 2010 12:54 |
| Last Modified: | 05 Mar 2011 10:02 |
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