PbMg1/3Nb2/3O3as a model object for light scattering experiments
| Autor: | S. G. Lushnikov, I. G. Siny, V. H. Schmidt, R. S. Katiyar |
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| Rok vydání: | 1999 |
| Předmět: |
Materials science
Condensed matter physics Phonon scattering business.industry Condensed Matter Physics Light scattering Electronic Optical and Magnetic Materials Condensed Matter::Materials Science symbols.namesake X-ray Raman scattering Optics Brillouin scattering symbols Coherent anti-Stokes Raman spectroscopy Rayleigh scattering Raman spectroscopy business Raman scattering |
| Zdroj: | Ferroelectrics. 226:191-215 |
| ISSN: | 1563-5112 0015-0193 |
| DOI: | 10.1080/00150199908230300 |
| Popis: | A classical relaxor material, PbMg1/3Nb2/3O3 (PMN), has a long history of investigations by Raman and Brillouin spectroscopies. Earlier results on Raman scattering have emphasized a predominant role of disorder and, on the whole, confirmed a model of compositional fluctuations, first suggested by Smolensky and his colleagues. The extensive microstructural studies of PMN in recent years require re-consideration of many conclusions. In the present paper, we initiated analysis of rather complex Raman scattering in order to reach a definite agreement with the recent direct microstructural studies. Different unambiguous features were analyzed in light of polarization measurements, a breakdown in the Raman selection rules, assignment of modes consistent with the Fm3m space group, the mode behavior for some ion substitutions, the key role of the high temperature transformation of the spectra in explaining the origin of Raman active modes, and some other aspects. The behavior of optical phonons is predom... |
| Databáze: | OpenAIRE |
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