Exploring the effect of sintering parameters on magnetic and microwaves absorption capacities of manganese-titanium substituted strontium hexaferrite

In this study, we report the results of co-substituting Mn²⁺ and Ti⁴⁺ ions for Fe³⁺ in Strontium hexaferrite lattice to obtain SrFe_(12−x)Mn_x/2Ti_x/2O₁₉ or SHF(MTO)_x and its effect on the microwave absorption capacity. Heat treatment for various periods led to grain growth in the SHF(MTO)x samples. Co-substituting Mn²⁺ and Ti⁴⁺ ions for Fe³⁺ in the main phase of SrFe₁₂O₁₉ with x = 1.0 reduced the coercivity of the sample x = 0.0 from 3.82 kOe to 1.68 kOe. This paper evaluates the combined effects of reduced coercivity and grain growth on microwave absorption capacity. The reflection loss (RL) value of SHF(MTO)x samples significantly increased with the reduction of coercivity. This increase ranged from −16.43 dB at 10.86 GHz (x = 0.0) to −42.60 dB at 10.28 GHz (x = 1.0), despite a decrease in bandwidth from 0.20 GHz to 0.18 GHz. The latter bandwidth increased to 0.65