Magnetic Properties and Morphologies of Synthesized Strontium Ferrite Powders by the Molten Salt Method

The magnetic properties of ferrite powders are known to be strongly dependent on their morphologies, such as size and shape. Thus, it is critical to synthesize homogeneous single-crystalline ferrite powders in order to improve the magnetic properties of composite magnetic sheets containing ferrite powders. In this experiment, strontium ferrite powders were synthesized using the molten salt method to control the microstructures and morphologies of the powders. As a result, single-crystalline hexagonal plate-shaped strontium ferrite powders with an average size of 2-3 μm were successfully obtained by the sequential calcination process at 850 °C for 1 h and then at 1050 °C for 1 h. These synthesized ferrite powders measured a magnetic saturation of 72.9 emu/g and a coercivity of 3255 Oe.