Investigation of Electrical Properties of BiFeO3/LDPE Nanocomposite Dielectrics with Magnetization Treatments

Abstract

The purpose of this paper is to study the effect of nano-bismuth ferrite (BiFeO3) on the electrical properties of low-density polyethylene (LDPE) under magnetic-field treatment at different temperatures. BiFeO3/LDPE nanocomposites with 2% mass fraction were prepared by the melt-blending method, and their electrical properties were studied. The results showed that compared with LDPE alone, nanocomposites increased the crystal concentration of LDPE and the spherulites of LDPE. Filamentous flake aggregates could be observed. The spherulite change was more obvious under high-temperature magnetization. An agglomerate phenomenon appeared in the composite, and the particle distribution was clear. Under high-temperature magnetization, BiFeO3 particles were increased and showed a certain order, but the change for room-temperature magnetization was not obvious. The addition of BiFeO3 increased the crystallinity of LDPE. Although the crystallinity decreased after magnetization, it was higher than that of LDPE. An AC test showed that the breakdown strength of the composite was higher than that of LDPE. The breakdown strength increased after magnetization. The increase of breakdown strength at high temperature was less, but the breakdown field strength of the composite was higher than that of LDPE. Compared with LDPE, the conductive current of the composite was lower. So, adding BiFeO3 could improve the dielectric properties of LDPE. The current of the composite decayed faster with time. The current decayed slowly after magnetization.

Polymer Composite with Enhanced Thermal Conductivity and Insulation Properties through Aligned Al2O3 Fiber

“…The use of the inorganic particles is shown to be beneficial in decreasing the partial discharges and can mitigate space charge accumulation, which is responsible for improving the electrical properties in these nanocomposites [18,19]. Two reasons can be explained as follows: some researchers considered that the charge transport process has been dependent on shallow trap assisted hops in the direction of the applied field [20][21][22][23]. However, Dissado and Fothergill [24,25] argue that the scattering processes are rather trap distributions that ultimately limit the electron mobility (although the traps may nonetheless serve as scattering centers).…”

Enhancement of ferromagnetism in a multiferroic La–Co co-doped BiFeO3 thin films

“…* Authors to whom any correspondence should be addressed. robust ferroelectricity induced by the highly polarized 6s 2 lone pair valence electrons of Bi 3+ cations, as well as a G-type antiferromagnetic alignment of the iron magnetic moments superposed with a 62 nm periodic cycloidal space-modulation, which is caused by the super-exchange interaction between the neighboring half-full d-shell of the Fe 3+ cation and O 2− anion [10,11].…”