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Influence of Ni dopant on the Structural and Electrical Properties of ZnFe2O4 nanoparticles

. Uzma G, Qaiser H, Asma S,


Abstract

Nano-crystalline NixZn1-x Fe2O4 (x = 0, 0.1, 0.3, 0.5, 0.7) were synthesized using chemical co-precipitate method and sintered at 700oC to study the effect of Nickel doping on the properties of ZnFe2O4 nanostructures. Debye-Scherer formula is used to calculate the average crystalline size, shows a decreasing value at lower concentrations of Ni, and increases further due to the mixed spinal structure of prepared ferrites. Decreasing trend in lattice parameters and d-spacing with increase in Ni2+ contents can be explained on the basis of ionic radius and lattice stress-strain produced by Ni ions. A decreasing trend in the dielectric constant (ε') and dielectric loss tangent (tanδ) with increasing frequency and Ni concentration is in accordance with the Maxwell-Wagner type interfacial polarization. Moreover, an increasing trend of ac conductivity (бac) with increasing frequency and decreasing with nickel concentration is also reported due to the reduction of Fe+3 ions in octahedral sites as a result of larger coulomb field in its locality.

Keywords: Chemical Synthesis; Co-precipitation method, Nano particles, X-ray diffraction; dielectric properties; electrical conductivity

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