Abstract
Samples of a polymer composite based on polypropylene and vanadium dioxide VO2 with the volume concentration from 0 to 1 were investigated. It was shown that the electrical conductivity of composites has the percolation-like character, and the current–voltage characteristics are S-shaped. In the temperature dependence of the electrical resistance of the composites samples, a sharp resistance decrease was detected at the temperature of the semiconductor–metal phase transition in VO2, sufficient for use in critical thermistor elements. It was established that the variance of the dielectric permittivity in the range of frequencies 105−107 Hz can be interpreted as part of the Maxwell’s mechanism of migration polarization associated with the separation of free charge carriers in vanadium dioxide particles in the semiconducting state. It was shown that the dependence of the low-frequency dielectric permittivity on the volume concentration of the filler can be interpreted in terms of a statistical mixture model.
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Kolbunov, V.R., Tonkoshkur, A.S. & Gomilko, I.V. Electrical and dielectric properties of polymer composite based on vanadium dioxide. J Mater Sci: Mater Electron 28, 8322–8328 (2017). https://doi.org/10.1007/s10854-017-6547-9
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DOI: https://doi.org/10.1007/s10854-017-6547-9