Abstract
Calcium-doped Mg-Co-Cr nanoferrites were synthesized using the chemical auto-combustion method. X-ray diffraction (XRD) data have excluded secondary phases and confirmed the presence of a pure spinel ferrite phase. Deposition of Ca2+ ions in the boundaries around the grains produces barriers for the grain growth and limitation for the size of nanoparticles to be less than 10 nm. Energy-dispersive X-ray spectroscopy (EDX) showed a good agreement between the theoretical and experimental data. Fourier transform infrared spectroscopy (FTIR) in the range 350–650 cm−1 has detected functional groups belonging to the spinel ferrite system. Magnetic measurements have been performed using a vibrating sample magnetometer (VSM) under an external magnetic field of ± 20 kOe. The M-H loops obtained for the samples at 100 K show a ferromagnetic behavior. The AC conductivity (σ) and dielectric parameters (ε′, ε″, and tan δ) were performed by using LCR Meter at frequencies up to 5 MHz. Substitutions of Ca2+ ions reduce the transfer of electrons between the magnetic Fe3+ ions in both tetrahedral A- and octahedral B-sites and consequently cause a variation in the dielectric parameters.
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Hashhash, A., Kaiser, M. Synthesis and Characterization of Calcium-Substituted Mg-Co-Cr Ferrite Nanoparticles with a Crystallite Size Less Than 10 nm. J Supercond Nov Magn 34, 3403–3412 (2021). https://doi.org/10.1007/s10948-021-06068-6
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DOI: https://doi.org/10.1007/s10948-021-06068-6