FTIR Studies and Dielectric Properties of Cu Substituted Nano Crystalline Nickel-Zinc Ferrites Synthesized By Citrate-Gel Auto Combustion Technique

The nano crystalline Cu doped Ni-Zn ferrites having compositional formula Ni0.2CuxZn0.8-x Fe2O4 (where x=0.0, 0.2, 0.4, 0.6 and 0.8) were synthesized successfully by Citrate-Gel Auto Combustion method at a low temperature (180 0 C). Analysis of the X-Ray diffraction pattern of all the samples confirmed the formation of single phase cubic final structure with an average crystallite size 24-73nm. In the present work, the effect of nano structured particle size and cu concentration on parameters such as bond length and vibration frequency are discussed with the help of FTIR data. The dielectric parameters such as dielectric constant, dielectric loss tangent, AC Conductivity of the samples were studied as the function of composition and frequency in the range 20Hz-2MHz at room temperature using Agilent E4980 precession, LCR meter.