Highly sinterable cobalt ferrite particles prepared by a modified solution combustion synthesis

摘要

Highly sinterable CoFe_2O_4 particles were prepared by a modified solution combustion synthesis, starting from a stoichiometric mixture of cobalt acetate (instead of cobalt nitrate), iron nitrate and 5-aminotetrazole. The resulted cobalt ferrite powder had large surface area (44 m~2/g), small crystallite size (11 nm) and a saturation magnetization of 38.9 Am~2/kg. CoFe_2O_4 pellets sintered at 1100 ℃ for 2 h developed a fine compact microstructure, reaching 99% of the theoretical density. After sintering, the saturation magnetization increased to 71.3 Am~2/kg whilst the coercivity decreased to 21.8 kA/m.