Microstructure and electromagnetic of tantalum substituted W-type hexagonal barium ferrite based on doping concentration

With the development of 5G electronic products, solving electromagnetic pollution becomes an urgent issue for human health. In this work, the electromagnetic performance of W-type hexagonal barium ferrite (BaZn 2 Fe 16−x Ta x O 27 ) was improved by doping with high-valence Tantalum (Ta 5+ ) ions. The dependence of the concentrations of Ta 5+ ions on the microstructure, crystal structure and electromagnetic properties was studied in detail. Structural characterizations confirm that the doping Ta 5+ prefers the 4f2 site, increasing the lattice values and grain size, promoting more Fe 3+ translation into Fe 2+ , which effectively improves the electromagnetic properties including saturation magnetization, complex permittivity and permeability. However, some Ta 2 O 5 was also formed at the doping concentration of x = 0.2 which deteriorates the electromagnetic properties. The BaZn 2 Fe 16−x Ta x O 27 ferrite at x = 0.15 obtains the highest value of saturation magnetization of 92 emu/g, the highest intensity of complex permittivity and permeability, showing a potential application in absorbing material.