Investigation of ferroelectric properties on nanocrystalline barium titanate ceramics
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.
出版日期: 2007-09-05
引用本文:
. Investigation of ferroelectric properties on nanocrystalline barium titanate ceramics[J]. Frontiers of Materials Science in China, 2007, 1(3): 319-321.
DENG Xiangyun, LI Dejun, WANG Xiaohui, LI Longtu. Investigation of ferroelectric properties on nanocrystalline barium titanate ceramics. Front. Mater. Sci., 2007, 1(3): 319-321.
