Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9829357 | Journal of Crystal Growth | 2005 | 8 Pages |
Abstract
Relaxor-type of ferroelectric material Ba(Fe1/2Nb1/2)O3 were fabricated by a sol-gel technique. The powders of Ba(Fe1/2Nb1/2)O3 heated at temperature greater than 550 °C were crystallized into a perovskite structure containing the pyrochlore phase. A pure perovskite phase was formed as the temperature increased to 850 °C. The activation energy of crystallization of Ba(Fe1/2Nb1/2)O3 is 64.25 kJ/mol calculated from Kissinger's equation. The average grain sizes increased with heating temperature (from 20 nm to 30 nm). The sample sintered at 1250 °C for 3 h, a dielectric constant, εmaxâ², of â¼20 000 and loss tangent of â¼0.2 were obtained at room temperature. Among the measured temperature, BFN is observed to have higher dielectric constant in room temperature than PMN or PFN. From the hysteresis loops (P-E curve) a large remnant polarization Pr of 0.2 μC/cm2 and coercive field Vc of 5 V/μm were measured. All of the properties clearly show that the BFN is a ferroelectric material.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Chao-Yu Chung, Yen-Hwei Chang, Guo-Ju Chen, Yin-Lai Chai,