ABSTRACT Nano particles of Co(0.5-x)NixZn0.5Fe2O4 (x = 0 to 0.3) is prepared by co-precipitation method. The X-ray diffraction analysis indicates the formation of single phase ferrite particle in nano size. The lattice constant for Co0.5Zn0.5Fe2O4 is found to be 8.38 &#197;, but the lattice constant decreases when cobalt is replaced by nickel up to x = 0.2 content. The formation of Fe2+ in octahedral site increases the lattice constant for the concentration x = 0.3. The dielectric constant of Co0.5Zn0.5Fe2O4 is found to be less than the bulk sample. The migration of Fe3+ ion from octahedral site to tetrahedral site decreases the dielectric constant with increase in nickel concentration. The charge libration and electron hoping together form the basis for the conduction mechanism in this present compound.
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nullG. Sathishkumar, C. Venkataraju and K. Sivakumar, "Synthesis, Structural and Dielectric Studies of Nickel Substituted Cobalt-Zinc Ferrite," Materials Sciences and Applications, Vol. 1 No. 1, 2010, pp. 19-24. doi: 10.4236/msa.2010.11004.
 S. Gubbala, H. Nathani, K. Koziol and R. D. K. Misra, “Magnetic Properties of Nanocrystalline Ni-Zn, Zn-Mn, and Ni-Mn Ferrites Synthesized by Reverse Micelle Technique,” Physica B: Condensed Matter, Vol. 348, No. 1-4, 2004, pp. 317-328.
 R. Arulmurugan, G. Vaidyanathan, S. Senthilnathan and B. Jeyadevan, “Co-Zn Ferrite Nanoparticles for Ferro- fluid Preparation: Study on Magnetic Properties,” Physca B: Condensed Matter, Vol. 363, No. 1-4, 2005, pp. 225- 231.
 M. U. lIslam, M. U. Rana and Abbas, “Study of Magnetic Interactions in Co-Zn-Fe-O System,” Materials Chemis- try and Physics, Vol. 57, 1998, pp. 190-193.
 O. M. Hemeda and M. I. Abd El-Ati, “Spectral Studies of Co0.6Zn0.4Fe2O4 at Different Soaking Times,” Materials Letters, Vol. 51, No. 1, 2001, pp. 42-47.
 R. K. Sharma, O. Suwalka, N. Lakshmi, K. Venugopala, A. Banerjee and P. A. Joy, “Synthesis of Chromium Substituted Nano Particles of Cobalt Zinc Ferrites by Coprecipitation,” Materials Letters, Vol. 59, 2005, pp. 3402-3405.
 A. Tawfik, “Electromechanical Properties of Co0.6Zn0.4 Fe2O4 Ferrite Transducer,” Journal of Magnetism and Magnetic Materials, Vol. 237, No. 3, 2001, pp. 283-287.
 O. S. Josyulu and Sobhanadri, “DC Conductivity and Dielectric Behaviour of Cobalt-Zinc Ferrites,” Physica Status Solidi (a), Vol. 59, 1980, pp. 323-329.
 Singhal, J. Singh, S. K. Barthwal and K. Chandra, “Preparation and Charectrisation of Nanosize Nickel- Substituted Cobalt Ferrites Co(1-x)NixFe2O4,” Journal of Solid State Chemistry, Vol. 178, No. 10, 2005, pp. 3183- 3189.
 I. H. Gul, A. Z. Abbasi, F. Amin, M. Anis-Ur-Rehman and A. Maqsood, “Structural, Magnetic and Electrical Properties of Co1−xZnxFe2O4 Synthesized by Co-precipi- tation Method,” Journal of Magnetism and Magnetic Materials, Vol. 311, No. 2, 2007, pp. 494-499.
 B. Cullity, “Elements of X-Ray Diffraction,” Addison –Wesley, London, 1978.
 P. B. Pandya, H. H. Joshi and R. G. Kulkarani, “Bulk Magnetic Properties of Co-Zn Ferrite Prepared by Co-precipitation Method,” Journal of Matierals Science, Vol. 26, 1991, pp. 5509-5512.
 A. M. R. de Figueiredo Teixeira, T. Ogasawara and M. C. de Souza Nobrega, “Investigation of Sintered Cobalt-Zinc Ferrite Synthesized by Co-precipitation at different Tem- peratures. A Relation between Microstructure and Hys- tresis Curve,” Materials Research, Vol. 9, No. 3, 2006, pp. 257-262,.
 B. P. Ladgaonkar and A. S. Vaingainkar, “X-ray Diffrac- tion Investigation of Cation Distribution in CdxCu(1-x) Fe2O4,” Materials Chemistry and Physics, Vol. 56, No. 3, 1998, pp. 280-283.
 C. S. Narasimhan and C. S. Swamy, “Studies on the Solid State Properties of the Solid Solution Systems MgAl(2-x) FexO4,” Physica Status Dolidi (a), Vol. 59, 1980, p. 817.
 M. A. Ahmed, K. A. Darwish, H. Mikhail, M. Mounir and E. H. El-Khawas, “Effect of Cation Concentration on the Relaxation Phenomena of Co-Zn Ferrite,” Physica Scripta, Vol. 55, 1997, pp. 750-755.
 P. Mathur, A. Thakur and M. Singh, “Effect of Particle Size on the Properties of Mn-Zn-In Ferrites,” Physica Scripta, Vol. 77, 2008.
 J. C. Maxwell, “A Treatise on Electricity and Magne- tisim,” Oxford University Press, New York, Vol. 1, 1973, p. 828.
 K. W. Wagner, “Zur Theorie der Unvollkommenen Dielektrika,” Annalen der Physik, Vol. 40, 1913, pp. 817-855.
 C. G. Koops, “On the Dispersion of Resistivity and Dielectric Constant of Some Semiconductors at Audio- frequencies,” Physical Review, Vol. 83, 1951, p.121.
 D. Ravinder and V. kumar, “Dielectric Behaviour of Erbium Substituted Mn-Zn Ferrites,” Bulletin of Materials Science, Vol. 24, No. 5, 2001, pp. 505-509.
 S. A. Olofa, “Oscillographic Study of the Dielectric Polarization of Cu-doped NiZn Ferrite,” Journal of Magnetism and Magnetic Materials, Vol. 131, 1994, pp. 103-106.
 U. N. Trivedi, M. C. Chhantbar, K. B. Modi and H. H. Johi, “Frequency Dependant Dielectric Behaviour of Cadmium and Chromium, Co-substituted Nickel Ferrite,” Indian Journal of Pure and Applied Physics, Vol. 43, 2005, pp. 688-690.
 K. Amarendra, T. Singh, C. Goel and R. G. Mendiratta, “Dielectric Properties of Mn-Substituted Ni-Zn Ferrite,” Journal of Applied Physics, Vol. 91, No. 10, 2002, p. 6626.