Magnetic Property Enhancement of Spinel Mn–Zn Ferrite through Atomic Structure Control
2020
Temperature treatment of magnetic
Mn–Zn ferrites with the composition Mn0.6Zn0.2Fe2.2O4 up to 1100 °C results
in a tremendous enhancement of the saturation magnetization by more
than 60%. Employing a robust combined Rietveld refinement of powder
X-ray and neutron diffraction (PXRD and NPD) data, it is revealed
how a reordering of the cations takes place during the annealing step,
the extent of which depends on the annealing temperature. While Zn(II)
exclusively occupies tetrahedral sites throughout the whole temperature
range, as the annealing temperature increases up to 700 °C, the
Mn(II) cation distribution shifts from 80(7)% of the total Mn content
occupying the octahedral sites (partly inverse spinel) to Mn only
being present on the tetrahedral sites (normal spinel). Above 700
°C,
pronounced crystallite growth is observed, followed by an increase
of the saturation magnetization. Complementary techniques such as
energy dispersive X-ray spectroscopy (EDS) and transmission electron
microscopy (TEM) confirm an even cation distribution and the particle
growth with annealing temperature. The structural changes caused by
annealing of spinel ferrites directly alter the magnetic properties
of the materials, thus serving as an easy handle for enhancing their
magnetic properties.
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