Magnetic properties of Ni-Co doped barium strontium hexaferrite

摘要

A series of Ni-Co substituted barium strontium hexaferrite materials, Ba_(0.5)Sr_(0.5)Ni_xCo_xFe_(12-2x)O_(19) (x = 0.0, 0.2, 0.4, 0.6, 0.8 mol%) was synthesized by the sol-gel method. X-ray diffraction analysis has shown that the NiCo substitutions maintain in a single hexagonal magnetoplumbite phase. The room temperature magnetic properties and the cation site preferences of Ni-Co substituted ferrite were investigated by VSM. Substitutions led to decrease in coercivity while saturation magnetization remains the almost same. It indicates that the saturation magnetization (52.81-59.8 Am~2/kg) and coercivity (69.83-804.97 Oe) of barium strontium hexaferrite samples can be varied over a very wide range by an appropriate amount of Ni-Co doping contents.