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- W4225100975 abstract "Magnetite (Fe3O4) nanoparticles were successfully prepared by a co-precipitation method. Rietveld refinement on the X-ray diffraction pattern confirmed the development of a single-phase cubic spinel structure with space group Fd3̄m. However, 57Fe Mössbauer spectroscopy suggested the presence of Fe3+ and Fe2.5+ (mixed Fe3+ and Fe2+) ions at the tetrahedral and octahedral sites of the inverse spinel structure, respectively. Impedance spectroscopy measurements showed a discontinues variation in the temperature dependence of the sample's resistive behavior, indicating the appearance of semiconductor-metal-semiconductor like transitions between the temperature range of 293 and 373 K. A similar dual transition was also observed from the dielectric and conductivity measurements around the same temperature regions. The observed unusual transition is explained in term of the competitive effects among the hopping of localized/delocalized and short-range/long-range charge carriers present in the sample. Moreover, the prepared sample exhibits colossal dielectric permittivity (∼106), reduced tangent loss (∼0.2) and moderate conductivity (>10-6 S cm-1) values, making Fe3O4 nanoparticles a potential candidate for electromagnetic absorbing materials." @default.
- W4225100975 created "2022-04-30" @default.
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- W4225100975 date "2022-01-01" @default.
- W4225100975 modified "2023-10-18" @default.
- W4225100975 title "Unusual semiconductor–metal–semiconductor transitions in magnetite Fe<sub>3</sub>O<sub>4</sub> nanoparticles" @default.
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- W4225100975 doi "https://doi.org/10.1039/d2ra00530a" @default.
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