Enhancement of dielectric and electrical properties in BFN/Ni/PVDF three-phase composites. (7th July 2017)

• Record Type: Journal Article
• Authors: Wang, Zhuo; Wang, Tian; Fang, Mingrui; Wang, Chun; Xiao, Yujia; Pu, Yongping
• Is Part Of: Composites science and technology. Volume 146(2017)
• Page Start: 139
• Page End: 146
• Publication Date: 2017-07-07
• Subjects: BFN/Ni/PVDF three-phase composite -- Percolation theory -- AC conductivity -- Dielectric property; Composite materials -- Periodicals; Composite materials; Fibrous composites; Periodicals; 620.118
• DOI: 10.1016/j.compscitech.2017.04.023
• Languages: English
• ISSNs: 0266-3538

Abstract

Abstract: To develop dielectric materials with high dielectric constant and low dielectric loss, a novel three-phase composite was prepared by embedding the nano-sized Ba(Fe0.5 Nb0.5 )O3 (BFN) crystallites and Ni crystallites into poly(vinylidene fluoride) (PVDF) matrix. The structure, dielectric and electrical properties of the composites were investigated. The superiority of this method is that, when compared with the two-phase Ni/PVDF composites, three-phase composites not only show significantly increased dielectric constants but also have lower dielectric loss. Our results show that a high dielectric constant of 475 and a relatively low loss of 0.61 were achieved at 100 Hz with 25 vol.% Ni and 50 vol.% BFN, respectively. The enhancement of dielectric constant of polymer based composites can be interpreted by the mini-capacitor principle and the interfacial polarization. The relatively low dielectric loss could be attributed to the isolation effect of BFN fillers. These composites with high dielectric constant and low dielectric loss are found to be potentially useful for embedded capacitor applications.