Synthesis and microwave absorption properties of Ca-substituted barium hexaferrite nano-crystalline synthesized via ceramic and mechanical milling method

To broaden the scope of a novel microwave absorbing material inside the x-band frequency range (8.2–12.4 GHz), Ca-substituted barium hexaferrite nano-crystalline were successfully synthesized prepared via standard ceramic route and mechanical milling method. The sintered BaFe 12 O 19 (x=0) and Ba 0.9 Ca 0.1 Fe 12 O 19 (x=1) at 1100°C for three hours were obtained the formation of magnetic phase and hysteresis behaviour and indicative of ferromagnetism. The analysis of x-ray diffraction was resulted to investigate the composition and magnetic phase. The dependence of complex permeability on frequency ( μ = μ ′ – j μ ″) and the permittivity ( ε = ε ′ – j ε ″) were obtained. The reflection loss, RL-values were calculated and resulted multi–broadband with a thickness of 9.7 mm. It proved that Ca-substituted barium hexaferrite nano-crystalline material has a great potential for microwave absorption and electromagnetic applications.