Articles written in Bulletin of Materials Science
Volume 34 Issue 7 December 2011 pp 1305-1308
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.
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