Ferroelastic phase in SrBi2Ta2O9 and study of the ferroelectric phase-transition dynamics
Polarized microscope observation of ferroelastic domains in a SrBi2Ta2O9 (SBT) single crystal reveals the presence of domains up to Tc1≃770 K, which supports the ferroelasticity and Amam symmetry of the intermediate phase between ferroelectric and paraelectric phases. Far-infrared spectra of SBT cer...
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| Veröffentlicht in: | Applied physics letters 2002-08, Vol.81 (6), p.1056-1058 |
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| container_end_page | 1058 |
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| container_title | Applied physics letters |
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| creator | Kamba, S. Pokorný, J. Porokhonskyy, V. Petzelt, J. Moret, M. P. Garg, A. Barber, Z. H. Zallen, R. |
| description | Polarized microscope observation of ferroelastic domains in a SrBi2Ta2O9 (SBT) single crystal reveals the presence of domains up to Tc1≃770 K, which supports the ferroelasticity and Amam symmetry of the intermediate phase between ferroelectric and paraelectric phases. Far-infrared spectra of SBT ceramics, single crystal and thin films show a well underdamped optical soft mode at 28 cm−1, which partially softens to 21 cm−1 near the ferroelectric transition temperature (Tc2≅600 K). This softening does not explain the entire anomaly of low-frequency permittivity observed near Tc2. On the basis of high-frequency measurements, which do not show a significant dispersion, central-mode-type dispersion in the 10–100 GHz range is proposed as an explanation. So, the phase transition at Tc2 apparently shows a crossover behavior between the displacive and the order–disorder type. |
| doi_str_mv | 10.1063/1.1498005 |
| format | Article |
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On the basis of high-frequency measurements, which do not show a significant dispersion, central-mode-type dispersion in the 10–100 GHz range is proposed as an explanation. 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This softening does not explain the entire anomaly of low-frequency permittivity observed near Tc2. On the basis of high-frequency measurements, which do not show a significant dispersion, central-mode-type dispersion in the 10–100 GHz range is proposed as an explanation. So, the phase transition at Tc2 apparently shows a crossover behavior between the displacive and the order–disorder type.</abstract><doi>10.1063/1.1498005</doi><tpages>3</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Applied physics letters, 2002-08, Vol.81 (6), p.1056-1058 |
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| language | eng |
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| source | AIP Journals Complete; AIP Digital Archive |
| title | Ferroelastic phase in SrBi2Ta2O9 and study of the ferroelectric phase-transition dynamics |
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