In uence of silicon dioxide medium on the structural and electrical properties ofnickel zinc ferrite

Abstract

Nickel zinc ferrite [(Ni0:65Zn0:35Fe2O4)x/ (SiO2)1xwhere, x = 1.0, 0.85, 0.65, 0.50, 0.35, and 0.15] issynthesized using the glyoxylate precursor method. The synthesis, characterization, and electrical study of nickel zincferrites/SiO2powder with low dielectric constant, very low conductivity, and loss tangent with low frequency dispersion,suitable for good insulators, is reported here. X-ray diffraction, TGA, and FT-IR studies are employed for identifyingcrystalline phases and structure. Crystallite size is calculated by the Scherrer formula and Williamson{Hall equation andfound to fall in the range of 4.9{25 nm. TEM of the samples shows spherical particles of uniform size distribution and thespotty rings of SAED patterns are analyzed for identifying the crystal planes. The study con rms a simple and efficientway to synthesize single-phase nickel zinc ferrite (NZFO) spherical particles of nano size ( 15 nm at 1000◦C) withlower particle agglomeration in comparison to any other methods. Electrical studies are carried out using an LCR meter.The observed value of dielectric constant falls in the range of 10{80, loss tangent in the range of 0.05{0.4, and electricalconductivity in the range of 104to 107mho m1. These values are respectively functions of temperature, frequency,and the ferrite content in ferrite/SiO2samples. A proper selection of ferrite concentration in the silica medium enablesone to prepare NZFO/SiO2material of very low loss tangent with dielectric constant in the range of 10{80.