The Effect of Chromium and Aluminium Ion Substitution on Phase Analysis, Microstructure and Magnetic Properties of Sr-Hexaferrite Ceramics and Nanopowders Synthesized by the Auto Combustion Route

摘要

The chromium and aluminium quantitiesrequired to synthesize nano-sized SrCr_x Fe_(12-x)O_(19) and SrAl_xFe_(12-x)O_(19) by the auto combustion route were optimized. XRD analysis showed that the optimum amounts were differed in two cases. A combination of 0.75 wt% of nano-sized SrFe_(12)O_(19) and 0.75 wt% of the commercial additive, in chromium doped sample from solid state process{Cr_2O_3 addition), resulted in superior magnetic properties with increased intrinsic coercivity, remanence magnetization and rectangularity ratio.