Preparation of Si/C/N/Fe magnetic ceramics derived from iron oxide and polysilazane with different carbon group
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Preceramic polymers have attracted remarkable interest in the last 2 decades due to their high processability into various shapes. Metal containing SiCN ceramics prepared from polysilazane (PSZ), have drawn special interests in engineering fields because of their electrical, magnetic, and catalytic properties. In this work, we report a novel strategy for the synthesis of nanocrystal containing magnetic ceramics by pyrolyzing Fe2O3 and two different polysilazanes, phenyl silsesquiazane (SSQZ) and vinyl polysilazane. Introduction of different carbon group into the precursors dramatically changes the microstructure and magnetic property of ceramics. It reveals that the ceramics pyrolyzed from different precursors have different crystallinity, which affect to magnetic properties. The ceramics from phenyl SSQZ exhibit high saturation magnetization (27.7 emu/g), whereas ceramics from vinyl polysilazane show low saturation magnetization (10.5 emu/g).