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

Abstract

The chromium and aluminium quantitiesrequired to synthesize nano-sized SrCr_x Fe_12-xO₁₉ and SrAl_xFe_12-xO₁₉ 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 SrFe₁₂O₁₉ and 0.75 wt% of the commercial additive, in chromium doped sample from solid state process(Cr₂O₃ addition), resulted in superior magnetic properties with increased intrinsic coercivity, remanence magnetization and rectangularity ratio.

Keywords:

• Auto combustion route
• ion substitution
• strontium hexaferrite