Cations distribution by Rietveld refinement and magnetic properties of MgCrxFe2−xO4 spinel ferrites

Magnesium–chromium ferrites MgCr x Fe 2− x O 4 (0 ≤  x  ≤ 1) were studied using X-ray diffraction and magnetization measurements. Rietveld refinement of XRD patterns confirmed the cubic spinel structure in the space group Fd-3m and enabled to obtain the cations’ distribution amongst octahedral and t...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2020-08, Vol.126 (8), Article 666
Main Authors: Ouyahia, S., Rais, A., Bozzo, B., Taibi, K., Addou, A.
Format: Article
Language:English
Subjects:
Applied physics
Cations
Characterization and Evaluation of Materials
Chromium
Condensed Matter Physics
Crystal lattices
Curie temperature
Diffraction patterns
Ferrites
Hysteresis loops
Machines
Magnesium
Magnetic moments
Magnetic properties
Magnetic saturation
Magnetism
Magnetization
Magnetometers
Manufacturing
Materials science
Nanotechnology
Optical and Electronic Materials
Physics
Physics and Astronomy
Processes
Remanence
Spinel
Superconducting quantum interference devices
Surfaces and Interfaces
Thin Films
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Summary:Magnesium–chromium ferrites MgCr x Fe 2− x O 4 (0 ≤  x  ≤ 1) were studied using X-ray diffraction and magnetization measurements. Rietveld refinement of XRD patterns confirmed the cubic spinel structure in the space group Fd-3m and enabled to obtain the cations’ distribution amongst octahedral and tetrahedral sites of this structure. Magnetization measurements were performed using vibrating sample magnetometer (VSM) in the temperature range of 300–700 K and superconducting quantum interference device (SQUID) in the range of 10–300 K. Hysteresis loops for each concentration x at 300 K, show non-linear variation of saturation magnetization ( M S ) with chromium content. Both coercitive field and remanence decrease with increasing chromium content. M S variations with temperature indicate that the Curie temperature T C decreases with increasing chromium content. On the basis of Néel’s two sub-lattice crystal field model, the cations’ distribution enabled to calculate the theoretical magnetic moments at 0 K which are compared and discussed with those extracted by extrapolation to 0 K from M S experimental data.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-020-03865-z