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Dielectric relaxation studies on two-dimensional nanocomposites of NiS and Na-4 mica

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Abstract

Na-4 mica template has been used to grow NiS nanosheets within the nanochannels with thickness ~0.6 nm. DC and ac electrical properties of the nanocomposite in a pellet-form have been measured over temperature range 313–473 K at frequencies from 102 to 106 Hz. The dc resistivity variation as a function of temperature has been explained as arising due to a parallel combination of NiS nanosheets and Na-4 mica grains. The activation energies of conduction have been found to be 0.23 and 0.45 eV in temperature ranges 323–363 K and 363–424 K, respectively. The frequency exponent s obtained from ac data has a value 0.7 which signifies a three-dimensional movement of the charge carriers involved. The dielectric modulus has been analyzed by two phase laminar conductor model proposed by Isard. The activation energies of dc resistivity and relaxation time are in reasonable agreement with each other in the different temperature ranges measured.

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Acknowledgments

AB thanks CSIR for providing her senior research fellowship. AM and SM acknowledge SRF-ships given to them by UGC. DC thanks INSA for the award of an honorary scientist’s position. The authors acknowledge DST Nano Mission supported project for providing the necessary facilities to carry out the present investigation.

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  1. A. Bose

    Present address: Reva Institute of Technology and Management, Kattigenahalli, Bangalore, 560 064, India

Authors and Affiliations

  1. MLS Professor of Physics Unit, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, 700 032, India

    A. Bose, A. Mandal, S. Mitra & D. Chakravorty

  2. Department of Physics, University of Calcutta, Kolkata, 700 009, India

    A. Mandal, S. Mitra & S. Banerjee

  3. Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, 700 032, India

    S. K. De

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  1. A. Bose
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Correspondence to D. Chakravorty.

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Bose, A., Mandal, A., Mitra, S. et al. Dielectric relaxation studies on two-dimensional nanocomposites of NiS and Na-4 mica. Indian J Phys 87, 977–981 (2013). https://doi.org/10.1007/s12648-013-0327-z

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  • DOI: https://doi.org/10.1007/s12648-013-0327-z

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