Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8151249 | Journal of Crystal Growth | 2014 | 5 Pages |
Abstract
The 0.93(Bi0.5Na0.5)TiO3-0.07BaTiO3 (BNB7T) piezoelectric single crystals and ceramics have been grown respectively by using the self-flux and solid-state-reaction methods. The real (εâ²) and imaginary (εâ³) parts of the dielectric permittivity of BNB7T crystals and ceramics were investigated with and without an electric (E) poling as functions of temperature and frequency. The BNB7T crystal shows a stronger dielectric maximum at Tm~240 °C than the ceramic at Tm~300 °C. The dielectric permittivity of BNB7T ceramic shows an extra peak after poling at an electric field E=40 kV/cm in the region of 80-100 °C designated as the depolarization temperature (Td). A wide-range dielectric thermal hysteresis was observed in BNB7T crystal and ceramic, suggesting a first-order-like phase transition. The dielectric permittivity εⲠobeys the Curie-Weiss equation, εâ²=C/(TâTo), above 500 °C, which is considered as the Burns temperature (TB), below which polar nanoregions begin to develop and attenuate dielectric responses.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
C.-S. Chen, C.S. Tu, P.-Y. Chen, Y. Ting, S.-J. Chiu, C.M. Hung, H.-Y Lee, S.-F. Wang, J. Anthoninappen, V.H. Schmidt, R.R. Chien,