Abstract
Bi-doped CoFe2O4 (CFO) nanoparticles with different contents of Bi (x = 0.0, 0.05, 0.1, 0.15, and 0.2) were prepared via sol–gel auto-combustion method. The structural characteristics of the prepared samples were characterized using room-temperature X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM). Moreover, the electrical conductivity and magnetic properties of the nanoferrites were investigated using impedance analyzer and vibrating sample magnetometer (VSM). Pure CFO and Bi-doped CFO showed spinel crystalline structure with the presence of secondary phase at higher doping content of Bi. The FESEM micrographs of the nanoferrites showed different aggregations for the different Bi contents and reduction in particle size was obtained with increasing Bi content. With Bi substitution, saturation magnetization was found to increase rapidly. The frequency (100 Hz–1 MHz) and temperature (30–450 °C)-dependent dielectric properties show that the dielectric constant is T-independent and at a certain point increasing trend overcomes. Magnetodielectric (MD) studies revealed the magnetic ordering of Bi-doped CFO consequences in the increase in number of polar domains thereby improving the magnetodielectric effect. The high MD property outcome of this work established the unification of the synthesized samples for multifunctional device applications.
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SS: conceptualization, writing—original draft preparation, supervision, reviewing, and editing; BD: synthesis and data collection, methodology, and data curation; SY: reviewing and editing; SR: experimental analysis and data collection, editing; JR: data collection.
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Dash, B., Saha, S., Yoshimura, S. et al. Analysis of substitution of bismuth cations in CoFe2O4 nanoparticles and their influence on frequency and temperature-dependent dielectric and magnetodielectric properties. J Mater Sci: Mater Electron 34, 2316 (2023). https://doi.org/10.1007/s10854-023-11716-9
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DOI: https://doi.org/10.1007/s10854-023-11716-9