Composite Based on Fe3O4@BaTiO3 Particles and Polyvinylidene Fluoride with Excellent Dielectric Properties and High Energy Density

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• 作者：Xiaoyun Huo ; Weiping Li ; Jiujun Zhu ; Lili Li ; Ya Li ; Laihui Luo ; Yuejin Zhu
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：November 19, 2015
• 年：2015
• 卷：119
• 期：46
• 页码：25786-25791
• 全文大小：375K
• ISSN：1932-7455

文摘

To obtain the dielectric material with high dielectric constant and high breakdown field, here a new composite material based on Fe₃O₄@BaTiO₃ shell鈥揷ore particles and polyvinylidene fluoride (PVDF) has been prepared. It is proved the Fe₃O₄@BaTiO₃ particles are good fillers with low conductivity for the percolation effect, which induces high dielectric constant and low dielectric loss in the Fe₃O₄@BaTiO₃/PVDF composite. The maximum dielectric constant is up to 3893, and dielectric loss is suppressed below 0.9. Moreover, the shell layer of Fe₃O₄ can be the trap and scattering centers to injected charges, so that the polarization saturation can be delayed to higher field. Thus, the released energy density of this composite can be enhanced greatly due to higher breakdown strength and lower energy loss.