Structure and dielectric properties in the radio frequency range of polymer composites based on vanadium dioxide

V. R. Kolbunov; A. S. Tonkoshkur; K. V. Antonova

doi:10.15222/TKEA2015.2-3.47

V. R. Kolbunov Oles Gonchar Dnepropetrovsk National University, Ukraine
A. S. Tonkoshkur Oles Gonchar Dnepropetrovsk National University, Ukraine
K. V. Antonova Oles Gonchar Dnepropetrovsk National University, Ukraine

DOI: https://doi.org/10.15222/TKEA2015.2-3.47

Keywords: polymer composite, vanadium dioxide, dielectric permittivity

Abstract

Polymer composites with active fillers are recently considered to be promising materials for the design of new functional devices with controllable properties and are intensively investigated. Dielectric studies are one of the most effective methods for studying structural features and mechanisms of conductivity formation for this type of two-component systems. The paper presents research results of the dielectric characteristics in the range of radio frequency of 50 kHz – 10 MHz and temperature range of 30 – 60°C of polyethylene composites of vanadium dioxide with different volume fractions of filler. Two dispersion areas were found: a high-frequency area caused by the Maxwell charge separation on the boundaries of the polyethylene matrix — conductive filler of VO₂ crystallites, and a low frequency area associated with the presence of the transition layer at this boundary. The relative permittivity of the composite has a tendency to a decrease in absolute value with increasing temperature. The analysis of the low-frequency dependence of the dielectric constant of the value of the filler’s volume fraction revealed that the investigated composite belongs to two-component statistical mixtures with a transition layer between the components.

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