International Journal of Advancements in Research & Technology, Volume 2, Issue1, January-2013 1 ISSN 2278-7763 Copyright © 2013 SciResPub. Dielectric, Magnetic, Electric and Structural Properties of Ni 0.2 -Co x -Zn 0.8-x Ferrite Nanoparticles Synthesized by Sol-Gel Auto Combustion Method R. B. Bhise 1* , S. M. Rathod 2 , A. K. Supekar 3 1 Department of Physics, JJT University, Jhunjhunu, Rajasthan (India) 2 Department of Physics, Abasaheb Garware College, Pune(MH) 3 Department of Physics, Balasaheb.Jadhav.College, Ale(Pune) Email: bhiseramesh@gmail.com Abstract: Nickel substituted Co x Zn 0.8-x Fe 2 O 4 (x=0.2, 0.5 and 0.6) ferrite were synthesized by Sol-gel auto combustion method. The powders were sintering at 400 o c and 700 o c for 2hrs to densify properly. The samples were characterized by XRD, SEM and FTIR and Magnetic properties. The XRD used to analyze phase structure and lattice parameters. The FTIR spectra confirmed that synthesis material is ferrite. Morphology of ferrite powders were investigated by using SEM. Porosity of synthesis ferrite is measured. The saturation magnetization increases with increasing Co-Zn concentration. Resistivity of ferrite material is may be decreases due to vary concentration of Co and Zn. Dielectric Properties show the variation in the dielectric loss factor of Ni-Co-Zn ferrite sintered at various temperatures. Key Words: Nanocrystalline, Structural, Magnetization, Resistivity, Dielectric, Sol-gel Auto Combustion method 1. Introduction Dielectric and Magnetic properties of Ni-Co-Zn have attracted attention because of their use at high frequency applications [1] . Because of high resistivity and low eddy current loss it also used as core material for transformer. NiFe 2 O 4 ,CoFe 2 O 4 and ZnFe 2 O 4 shows good dielectric and magnetic properties for technical application hence it is widely used in capacitor and magnetic cores of read-write heads for high speed digital recording and production of electronic and magnetic components [2] . Which are depends on various parameters such as processing conditions, sintering temperature and time as well as on their chemical composition [3] . Researchers are used a variety of techniques including alternative sputtering technology, Pulse-Laser deposition, and spin-spray plating etc to deposit film [4] . However most of them cannot be economically applied on a large scale because they required high vacuum system, complicated experimental steps and high reaction temperatures. In this study, chemical synthesis route called sol-gel auto combustion method has been applied synthesize NF, CF and ZF [2-4] . This method is useful to achieve the fabrication of magnetic nanoferrites at low annealing temperature. The size and morphology of nano particles and their properties may be controlled by modifying the composition of the nanocomposites and by thermal treatment conditions [5] . Due to the small size of the nanocrystals, an important part of the atoms are located at the surface this is the reason why the sol-gel synthesis method gone on intensive development [6] . Upto this stage the research work on Ni-CO-Zn ferrite is very limited. The sol-gel method was used for synthesis of this nanoferrites material. This method involves hydrolysis [7-8] . In this paper we present a study of the magnetic and structural properties of Ni 0.2 CO 0.2 Zn 0.6 Fe 2 O 4 , Ni 0.2 CO 0.5 Zn 0.3 Fe 2 O 4 and Ni 0.2 CO 0.6 Zn 0.2 Fe 2 O 4 nanocomposites of different composition. The composition, crystal structure, morphology, and size distribution of Ni-Co-Zn ferrite nanocrystals can be controlled by adjusting the