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• W4295655662 abstract "In the present study, rare earth samarium (Sm 3+ ) substituted Ni–Cu spinel ferrites with the composition of Ni 0.1 Cu 0.9 Sm x Fe 2– x O 4 (0 ≤ x ≤ 0.05 in steps of 0.01) were synthesized by using the citrate induced sol–gel auto combustion technique. These ferrites' structural, optical, magnetic, and dielectric studies were carried out using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), ultraviolet–visible (UV–vis), a vibrational sample magnetometer (VSM), and LCR meters. The pure Ni–Cu ferrite exhibits a tetragonal structure owing to the presence of the John Tellar ion (Cu 2+ ). XRD spectra confirm that the tetragonal structure gradually transforms into the cubic spinel structure with samarium substitution. The nano-scale structures of these ferrites were confirmed by the average crystallite size (10.11–20.99 nm) derived from the X-ray diffraction spectra, and grain size (42.60–83.36 nm) assessed from FE-SEM photographs. The existence of elements according to their chemical composition was verified by using EDX spectra. The absorption bands ( υ 1 and υ 2 ) detected in FTIR transmission spectra below the wavenumber of 600 cm −1 revealed the stretching vibrations of M−O bonds in the spinel structure at tetrahedral and octahedral locations. The band gap energy obtained from UV absorption revealed the semiconducting nature of the samples. The high saturation magnetization ( M s ) was noticed at 15 K temperature for x = 0.02 composition as 32.98 emu/g, while at 300 K for x = 0.01 composition as 27.61 emu/g. The suggested cation distribution is in good agreement with observed and predicted magnetic moment values at 300 K. The expected behavior of ferrites reveals the observed dielectric constant, loss tangent, and ac-conductivity values in the frequency range of 20 Hz–20 MHz. Cole–Cole plots confirm that the impedance contribution is attributed to grain boundaries. The rare earth samarium (Sm 3+ ) substitution in Ni–Cu spinel ferrites induces the progressive transition to a cubic spinel structure from a tetragonal structure. The M-H loops reveal that the cooling of samples from 300 to 15 K enhances the magnetization nature. Cole–Cole plots confirm that the impedance contribution is attributed to grain boundaries. • Ni 0.1 Cu 0.9 Sm x Fe 2– x O 4 (0 ≤ x ≤ 0.05 in steps of 0.01) nanoscale ferrites were developed by the citrate induced sol gel auto combustion technique. • Samarium substitution promotes the structural transition from tetragonal to cubic in the presence of minor impurity peaks, which was validated by XRD spectra. • An enhanced magnetic behavior is observed when the sample is cooled from 300 to 15 K. • Electric parameters reveal the normal behavior of ferrites." @default.
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• W4295655662 date "2022-09-01" @default.
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• W4295655662 title "Sm3+ induced structural phase transition, spectral, morphological, magnetic, dielectric and impedance properties of Ni0.1Cu0.9Sm Fe2–O4 nanoferrites" @default.
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• W4295655662 doi "https://doi.org/10.1016/j.jre.2022.09.011" @default.
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