www.derpharmachemica.com t Available online a Scholars Research Library Der Pharma Chemica, 2015, 7(3):11-15 (http://derpharmachemica.com/archive.html) ISSN 0975-413X CODEN (USA): PCHHAX 11 www.scholarsresearchlibrary.com Electrical properties of Ni-Mg-Cu nanoferrites synthesized by sucrose precursor technique R. S. Totagi 2 , N. J. Choudhari 1 , S. S. Kakati 1 , C. S. Hiremath 1 , S. B. Koujalagi 2 and R. B. Pujar 1 * 1 Department of Physics, P. C. Jabin Science College, Vidyanagar, Hubli, Karnataka, India 2 Department of Chemistry, P. C. Jabin Science College, Vidyanagar, Hubli, Karnataka, India _____________________________________________________________________________________________ ABSTRACT Nickel-Magnesium-Copper ferrites with the general chemical formula Ni 0.5 Mg x Cu 0.5-x Fe 2 O 4 with x=0.1, 0.2, 0.3, 0.4, and 0.5, were synthesized by sucrose precursor technique. Resistivity, as a function of composition, was measured from room temperature to 700 o C by two probe method. These ferrites show higher resistivity than those prepared by conventional ceramic method. This is attributed to the control over composition and microstructure by sucrose method. On account of high resistivity and low eddy current losses, these ferrites find wide applications over a wide range of high frequency devices. Conduction in ferrites obeys Verway de Boer mechanism [1]. Keywords: Ceramics, Chemical synthesis, Sintering, Grain boundaries, X-ray diffraction. _____________________________________________________________________________________________ INTRODUCTION Research on ferrites materials is getting more and more interest from the last few decades, because of their wonderful electromagnetic properties in electronic industry [2]. The conductivity, in ferrites, depends upon the presence of Fe 2+ and Fe 3+ ions on equivalent sites as well as preparation technique [3, 4]. The conductivity of the materials in their bulk form is limited to a few MHz, due to the presence of grains on micrometric scale, which results in high conductivity and domain wall resonance [5]. Nowadays, electronic industry is in need of more compact cores to work at higher frequencies [6]. Hence researchers are trying to synthesize and characterize ferrite particles on nano metric scale to eliminate domain wall resonance so that the material can work at higher frequencies. Nano ferrite particles can be synthesized by physical as well as chemical methods. Among the chemical methods, the sucrose precursor technique is used to synthesize Ni-Mg-Cu nano ferrites which minimize the major problems associated with diffusion, impurities and agglomeration and provide homogeneous powders. MATERIALS AND METHODS Experimental Technique AR grade nickel nitrate, magnesium nitrate, copper nitrate and ferric nitrate, in molar proportions, were dissolved in 50ml of distilled water to prepare 20gr of ferrites powder. Sucrose and PVA in liquid form, 10% concentration and 60% concentration respectively, were used as precursors and added to the mixture of nitrates and heated in a round bottom flask with L-tube on a magnetic stirrer at about 80 o C, till NO 2 fumes disappear, to form viscous mixture. Then the mixture was transformed to 500 ml borosil beaker and heated on a gas heater till the powder began to burn like live charcoal, undergoing oxidation to form smooth and fluffy powder. These powders were pre sintered at 900 o C for 10hrs to obtain spinel ferrites. These powders were pressed in to 2mm thick pellets of 10mm diameter at a