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Structural and Magnetic Properties of (Mg 0.8 Fe 2+ 0.2 )(Al 0.4 Cr x Fe 3+ 1.6− x )O 4 Spinel Solid Solution Obtained by Molten Salt Synthesis
Author(s) -
Wu Xingrong,
Pan Tiantian,
Shen Xingmei,
Cao Fabin,
Wu Zhaojin
Publication year - 2021
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.202000518
Subject(s) - magnetization , spinel , analytical chemistry (journal) , superparamagnetism , materials science , electron paramagnetic resonance , ferromagnetism , octahedron , crystallography , ion , nuclear magnetic resonance , crystal structure , chemistry , condensed matter physics , magnetic field , physics , organic chemistry , chromatography , quantum mechanics , metallurgy
(Mg 0.8 Fe 2+ 0.2 )(Al 0.4 Cr x Fe 3+ 1.6− x )O 4 ( x = 0.0, 0.4, 0.8, 1.2, and 1.6) spinel particles are prepared by molten salt method at 1050 °C for 5 h. The solid solution structure is determined by X‐ray diffraction (XRD) as cubic spinel with Fd‐3m space group. The lattice parameter and crystalline size decrease with increasing Cr content. Cr 3+ ions occupy the octahedral sites, as shown by combined Fourier transform infrared spectroscopy (FTIR) and XRD analysis. The magnetization as a function of field (±4.52 T) and field‐cooled (FC) and zero‐field‐cooled (ZFC) magnetization measurements under a field of 100 Oe is measured for temperatures ranging from 1.5 to 300 K. It is found from M ( T ) curves that the interparticle interactions are suppressed below 28.1–40.8 K, and the curves also shows the ferromagnetic from M ( H ) hysteresis for the samples with x = 0.0, 0.4, and 0.8. However, for x = 1.2 and 1.6, the samples show superparamagnetic, as also supported by the obtained electron paramagnetic resonance (EPR) and Mössbauer spectra.