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• W1970166930 endingPage "093704" @default.
• W1970166930 startingPage "093704" @default.
• W1970166930 abstract "We have investigated the magnetic and electrical response of the sol-gel synthesized NiFe2O4 nanoparticles. Changes in the impedance plane plots with temperature have been discussed and correlated to the microstructure of the material. Thermally activated hopping carriers between Fe3+-Fe2+ and Ni2+-Ni3+ ions have been determined for a decrease in the resistance of the sample and a change in the conduction mechanism around 318 K. The mixed spinel structure and broken exchange bonds due to small size effects are due to the canted spin structure at the surface of the nanoparticles. The magnetization is found to be influenced by the surface spin canting and anisotropy. We have established the semiconducting to metallic transition (SMT) temperature to be around 358 K in terms of localized and delocalized eg electrons along with a transition from less conductive [Fe3+–O2−–Fe3+] and [Ni2+–O2−–Ni2+] linkage to more conductive [Fe3+–Fe2+] and [Ni2+–Ni3+] linkage at the octahedral B site. A decrease in the dielectric constant with temperature has been discussed in terms of the depletion of space charge layers due to the repulsion of delocalized eg electrons from the grain boundary planes. The anomalies in tangent loss and conductivity data around 358 K are discussed in the context of the SMT." @default.
• W1970166930 created "2016-06-24" @default.
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• W1970166930 date "2011-05-01" @default.
• W1970166930 modified "2023-10-02" @default.
• W1970166930 title "Metal-semiconductor transition in NiFe₂O₄ nanoparticles due to reverse cationic distribution by impedance spectroscopy" @default.
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• W1970166930 doi "https://doi.org/10.1063/1.3582142" @default.
• W1970166930 hasPublicationYear "2011" @default.
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