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

Bulletin of materials science

S N Dolia³  Arun S Prasad²  P Predeep¹ 

[1] Laboratory for Unconventional Electronics and Photonics, National Institute of Technology, Calicut 673 601, India$$Laboratory for Unconventional Electronics and Photonics, National Institute of Technology, Calicut 673 601, IndiaLaboratory for Unconventional Electronics and Photonics, National Institute of Technology, Calicut 673 601, India$$;Arulmigu Meenakshi Amman College of Engineering, Vadamavandal 604 410, India$$Arulmigu Meenakshi Amman College of Engineering, Vadamavandal 604 410, IndiaArulmigu Meenakshi Amman College of Engineering, Vadamavandal 604 410, India$$;Department of Physics, University of Rajasthan, Jaipur 302 004, India$$Department of Physics, University of Rajasthan, Jaipur 302 004, IndiaDepartment of Physics, University of Rajasthan, Jaipur 302 004, India$$

关键词: Nanoparticle;    dielectric constant;    hopping;    conducting polymer.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The spinel ferrite nano-particles of chemical composition Ni_0.2Ca_0.8Fe₂O₄ have been prepared by solâ€�?�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.

【 授权许可】

Unknown