Ferroelectric phase transitions studied by dielectric and light scattering spectroscopies on Ba1-xCaxTiO3 single crystals (x=0.12, 0.20)
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- Ferroelectric phase transitions studied by dielectric and light scattering spectroscopies on Ba1-xCaxTiO3 single crystals (x=0.12, 0.20)
- Kim, Tae Hyun; Ko, Jae-Hyeon; Kim, Sung Baek; Park, Kibog; Kojima, Seiji
- Acoustic anomalies; Compositional disorder; Curie Weiss law; D. BaTiO 3 and titanates; Electrostrictive coupling; Ferroelectric phase transition; Ferroelectric phase transition temperatures; Ferroelectric property; High temperature; Light scattering spectroscopy; Optical floating zone methods; Paraelectric phase; Polar cluster; Random substitution; Structural phase transition; Temperature dependence; Tetragonal phase; TiO; X-ray diffraction investigations
- Issue Date
- ELSEVIER SCI LTD
- CERAMICS INTERNATIONAL, v.38, no., pp.S21 - S24
- The ferroelectric phase transition of Ca-substituted barium titanate single crystals, Ba1-xCaxTiO3 (BCTO-x), with x = 0.12 and 0.20 grown by optical floating zone method were studied by dielectric and Brillouin scattering methods. The X-ray diffraction investigation confirmed the structural phase transition from cubic to tetragonal phase in BCTO-x. The dielectric constant exhibited a sharp peak at the ferroelectric phase transition temperature (T-c) and a deviation from the Curie Weiss law on approaching T-c from the high-temperature side. Brillouin scattering results showed that, similar to the acoustic properties of BCTO-0.20, dynamic precursor polar clusters are formed in the paraelectric phase of BCTO-0.12 single crystals which interact with acoustic waves via electrostrictive coupling resulting in large acoustic anomalies near T-c. However, the temperature dependence of the dielectric constant indicated that diffuseness of the ferroelectric phase transition of BCTO-x became enhanced with Ca content, which was attributed to compositional disorder induced by random substitution of Ba cations by Ca ions.
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