Ferrimagnetic to antiferromagnetic transition and complex impedance analysis of Cr-doped magnesium ferrite nanoparticles

The chromium-doped magnesium ferrite (MgCr x Fe 2− x O 4 , x  = 0.0, 0.4, 0.8, 1.2, 1.6, and 2.0) were prepared using sol–gel technique. X-ray diffraction scans confirmed the cubic spinel structure for all the nanoparticles samples. Reduction in lattice parameter and average crystallite size with in...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2020-06, Vol.31 (11), p.8578-8588
Main Authors: Khan, K., Iqbal, Z., Abbas, Hur, Hassan, A., Nadeem, K.
Format: Article
Language:English
Subjects:
Antiferromagnetism
Bond strength
Bonding strength
Characterization and Evaluation of Materials
Chemistry and Materials Science
Circuits
Coercivity
Computer simulation
Crystallites
Cubic lattice
Dielectric properties
Ferrimagnetism
Lattice sites
Magnesium ferrites
Magnetic saturation
Materials Science
Nanoparticles
Nyquist plots
Optical and Electronic Materials
RC circuits
Room temperature
Sol-gel processes
Trivalent chromium
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Summary:The chromium-doped magnesium ferrite (MgCr x Fe 2− x O 4 , x  = 0.0, 0.4, 0.8, 1.2, 1.6, and 2.0) were prepared using sol–gel technique. X-ray diffraction scans confirmed the cubic spinel structure for all the nanoparticles samples. Reduction in lattice parameter and average crystallite size with increasing Cr 3+ concentration was observed due to smaller ionic radii of Cr 3+ (0.67 Å) ions as compared to Fe 3+ (0.63 Å) ions. In FTIR vibrational studies, the addition of Cr 3+ shows the splitting of ν 1 band into two sub-bands due to variation of bond strength between same cations present at tetrahedral and octahedral lattice sites. With increasing Cr 3+ concentration, the ZFC–FC magnetic curves revealed a ferrimagnetic (FiM) to antiferromagnetic (AFM) transition as compound transformed from MgFe 2 O 4 to MgCr 2 O 4 . The M–H loops revealed decrease in saturation magnetization with increase in Cr 3+ concentration which is attributed to FiM to AFM transition. The coercivity showed a non-monotonic behavior and has maximum value of 750 Oe for x  = 1.2 due to overlapping of blocking and Neel transition temperatures. The dielectric properties showed a decreasing trend with increasing Cr 3+ concentration. The room temperature impedance spectroscopy (Nyquist plots) was simulated using equivalent RC circuit model and an appearance of second semi-circle in the Nyquist plot with increasing Cr 3+ concentration is observed which can be attributed to the contribution of grains in the hooping mechanism.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-020-03393-9