The ferroelectric mode in orthorhombic KNbO3
| Autor: | J.P. Hurrell, D.G. Bozinis |
|---|---|
| Rok vydání: | 1975 |
| Předmět: |
Materials science
Condensed matter physics business.industry Isotropy Infrared reflectivity Mode (statistics) General Chemistry Low frequency Condensed Matter Physics Ferroelectricity Condensed Matter::Materials Science symbols.namesake Optics Materials Chemistry symbols Orthorhombic crystal system Anisotropy business Raman scattering |
| Zdroj: | Solid State Communications. 17:1541-1543 |
| ISSN: | 0038-1098 |
| DOI: | 10.1016/0038-1098(75)90991-6 |
| Popis: | Both Raman scattering and infrared reflectivity measurements have been performed to determine the complete optic mode spectrum of orthorhombic KNbO3 and characterize the ferroelectric modes. The low frequency, k ∼ 0 mode is quasitransverse and possesses a spacial anisotropy similar to the TA branch at finite k. Of the original cubic ferroelectric mode, the component along the remaining soft direction is found at 56 cm-1 and not overdamped (Γ/ω = 1), while the other two components have stiffened equally so that the mode is essentially isotropic in the orthogonal polarizations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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