Structural and Dielectric Investigations of Ferrite Nanoparticles Prepared by Chemical Co-Precipitation Method
Fe3O4 nanoparticles have been synthesized by chemical co-precipitation method. Powder X-ray diffraction technique has been used for structural characterization. The X-ray diffraction pattern confirms the single crystalline phase of the developed particles. Structural parameters viz. crystallite size, lattice constant, X-ray density, porosity, specific surface area, lattice strain are calculated using the X-ray diffraction data. Crystalline size as calculated by Scherrer formula for diffraction peak corresponding to the (311) plane and was found to be 22 nm. Transmission Electron Microscopy (TEM) micrograph confirms the nano-size confirmation of prepared sample. Dielectric parameters i.e., real part of dielectric constant (ε′), dielectric loss (tan δ) and ac conductivity (σ ac) of synthesized nano-particle have been studied in frequency range of 100 Hz–5 MHz and in temperature range of 300 K to 473 K. The sharp decrease in the values of dielectric constant (ε′) at lower frequencies has been observed which is in accordance with Maxwell-Wagner two layer model. σ ac increases with increase in frequency and temperature which is in accordance with Jonscher's power law. At low frequencies σ ac is almost constant which corresponds towards the dc component of total conductivity. DC resistivity measurements are done on sample pallet in the temperature range 343 K to 573 K, a conductivity of the order of 4.29 × 10–7 mho/m was observes at 343 K and also a decrease in electrical resistivity of Fe3O4 nanoparticles with increase in temperature has been observed which ensure the semiconducting nature of prepared ferrite sample.
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Document Type: Research Article
Publication date: June 1, 2014
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