SOL-GEL SYNTHESIS AND DIELECTRIC PROPERTIES OF SAMARIUM DOPED NANOCRYSTALLINE COBALT ZINC FERRITE.

Polycrystalline Co0.7Zn0.3SmyFe2-yO4 with y varying from 0.0 to 0.4 has been prepared by sol- gel auto combustion route. Dielectric properties such as dielectric constant and dielectric loss were studied as a function of Sm3+ substitution and frequency. Dielectric constant decreases with increasing frequency. The dielectric behavior was explained on the basis of interfacial polarization according to Koops theory. Variation of AC conductivity with frequency confirms the conduction due to p and n-type charge carriers.