|
|
|
Investigation of ferroelectric properties on nanocrystalline barium titanate ceramics |
| DENG Xiangyun1, LI Dejun1, WANG Xiaohui2, LI Longtu2 |
| 1.College of Physics and Electronic Information, Tianjin Normal University, Tianjin 300387, China; 2.State Key Lab of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China; |
|
|
|
|
Abstract Dense nanocrystalline BaTiO3 (BT) ceramics with 50 nm average grain size obtained by spark plasma sintering were investigated. The dielectric data showed a ferro para phase transition with a maximum permittivity of 1,602 at 120ºC and at 1 kHz. The polarization reversal characteristics were measured, and the typical piezoelectric hysteresis loop was recorded. The asymmetry of permanent polarization and coercive field in polarization-electric field curves were obtained and attributed to the existence of an internal electric field. The present results provide experimental evidence, indicating that if a critical grain size exists for ferroelectricity, then it is less than 50 nm for polycrystalline BT ceramics.
|
|
Issue Date: 05 September 2007
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
