Investigation of low-temperature sintering of Z-type hexaferrite with Bi(Co),Zn substitution and Bi_2O_3 additive

Z-type hexaferrite material with Bi(Co),Zn substitution and Bi2O3 additive were prepared by solid-state reaction method.The samples were characterized by X-ray diffraction and scanning electron microscopy(SEM).Electromagnetic properties were investigated using an impedance analyzer.Experimental results showed that minor Bi substitution does not destroy the phase formation of Z-type hexagonal ferrite,but lower the phase formation temperature distinctly,and that Zn substitution leads to an increase in initial permeability.The best result was obtained for sample with composition Ba3-xBixCo2+x-yZny Fe24-xO41(x=0.15,y=0.8) sintered at 900℃ containing 2wt% of bismuth oxide as a sintering additive.Its initial permeability reaches 4.2.