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Structural and Dielectric Investigations of Ferrite Nanoparticles Prepared by Chemical Co-Precipitation Method

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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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Keywords: ACTIVATION ENERGY; DIELECTRICS; ELECTRICAL RESISTIVITY; NANO-FERRITES; STRUCTURAL PARAMETERS; X-RAY DIFFRACTION

Document Type: Research Article

Publication date: June 1, 2014

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  • Journal of Advanced Physics is an interdisciplinary peer-reviewed journal consolidating research activities in all experimental and theoretical aspects of advanced physics. The journal aims in publishing articles of novel and frontier physics that merit the attention and interest of the whole physics community. JAP publishes review articles, full research articles, short communications of important new scientific and technological findings in all latest research aspects of physics.
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