• Dielectric behaviour of nano-crystalline spinel Ni0.2Ca0.8Fe2O4 and their nano-composite with polypyrrole

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    • Keywords


      Nanoparticle; dielectric constant; hopping; conducting polymer.

    • Abstract


      The spinel ferrite nano-particles of chemical composition Ni0.2Ca0.8Fe2O4 have been prepared by sol–gel method. Subsequently, the nanoparticles are encapsulated with the intrinsically conducting polymer shell of polypyrrole. The X-ray diffraction patterns confirm the single phase cubic spinel structure of the materials. To understand the dielectric properties of the materials, frequency-dependent dielectric measurement has been performed at 300 K in the range of 100 mHz to 2 MHz. On polymerization, both the dielectric strength as well the dielectric loss is significantly increased. Also, the dielectric conductivity, which arises from the electron hopping mechanism, is considerably increased on polymerization.

    • Author Affiliations


      Arun S Prasad1 S N Dolia2 P Predeep3

      1. Arulmigu Meenakshi Amman College of Engineering, Vadamavandal 604 410, India
      2. Department of Physics, University of Rajasthan, Jaipur 302 004, India
      3. Laboratory for Unconventional Electronics and Photonics, National Institute of Technology, Calicut 673 601, India
    • Dates

  • Bulletin of Materials Science | News

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