Magnetic and FTIR studies of Bi_xY_(3-x)Fe_5O_(12) (x = 0,1,2) powders prepared by the metal organic decomposition method

摘要

The crystallization process of bismuth substituted yttrium iron garnet (Bi_xY_(3-x)Fe_5O_(12); x=0,1,2) powder prepared by the metal-organic decomposition method has been studied with various sintering temperatures. The pure garnet phase was observed for the x = 1 powder at 900 °C sintering temperature, whereas the x = 0,2 powder showed secondary phases. The x = 0 powder showed a similar crystallization process to that of the solid state reaction method. For the x =1,2 powders, it is proposed that the lowering of the crystallization temperature is due to the lowered stability of the intermediate phase. The infrared spectroscopy and magnetic properties were also investigated.