Abstract
To enhance the magnetic properties of ferrite powders, it is critical to control their compositions and morphologies. In particular, composite sheets containing ferrite powders for EM absorbers and magnetic sensors require homogeneous single crystal ferrite powders to obtain the tunable properties. In this experiment, Mn substituted strontium ferrite powders for high coercivity were synthesized by the molten salt method to control their morphology and structure. As a result, single crystalline hexa-ferrite powders with an average size of 1∼3 μm were successfully obtained by initial calcination at 850°C for 1 hr and then at 950°C for 1 hr and subsequent calcination at 1050°C for 0.5 hr. These synthesized powders were revealed to have a magnetic saturation of 72.6 emu/g and a coercivity of 4019 Oe.
Highlights
Since the development of barium ferrite in the 1950s, the magnetic saturation (Ms)-type permanent magnets have accounted for the largest demand and production on the permanent magnet market
It was found that changes in the coercivity and the saturation magnetization generally have an opposite trend by adding doping elements
These XRD results confirm that the molten salt method is an effective method for the formation of M-type hexa-ferrite powders at low temperature
Summary
Since the development of barium ferrite in the 1950s, the M-type permanent magnets have accounted for the largest demand and production on the permanent magnet market This is due to that M-type ferrite has excellent corrosion resistance and the best magnetic properties for the price.. The effects of a dopant element on the magnetic properties of M-type ferrite magnet have been consistently investigated to increase its saturation magnetization and coercivity. Previous studies showed that the Fe ions in the M-type ferrite structure can occupy five different sites including two anti-parallel spin sites (4f1, 4f2).. Previous studies showed that the Fe ions in the M-type ferrite structure can occupy five different sites including two anti-parallel spin sites (4f1, 4f2).3 This indicates that the magnetic properties should be strongly dependent on the electronic configuration of substitute elements. The influence of manganese dopant and the molten salt method on the microstructures and magnetic properties has been investigated to analyze their relationship
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