Magnetoconductivity and electrical transport of polyaniline coated ternary carbide Ti 0.9 Al 0.1 C

Abstract

In this paper, we report the mechanism of electrical transport properties of polyaniline coated Ti_0.9Al_0.1C prepared by chemical route. Samples are characterized by X-ray diffraction technique and morphology has been observed by field emission scanning electron microscope. Semiconducting behavior is obtained for the samples and this behavior has been analyzed by different existing models. Out of different models the Mott's variable range hopping is the most suitable for analyzing the dc conductivity at lower temperatures. Correlated barrier hopping type of charge transfer process is followed in alternating current conductivity. We observe a transformation from negative to positive dc and ac magnetoconductivity by incorporating Ti_0.9Al_0.1C in polyaniline. Dielectric properties and impedance analysis are described by Maxwell–Wagner capacitor model. We determine different parameters like localization length, hopping distance, density of states from the analysis of the experimental data. The theory regarding magnetic field dependent ac conductivity is insufficient. This result will be a significant hint for a new theoretical challenge.

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