Heterovalent substituted BaFe12-xSnxO19 (0.1≤ x ≤1.2) M-type hexaferrite: Chemical composition, phase separation, magnetic properties and electrodynamics features

•Correlation of Sn-content in BaM hexaferrites, phase composition and MW properties was observed.•Impact of heterovalent substitution on Ms and Hc was discussed.•High electromagnetic absorption was achieved in 2–4 GHz frequency range.•More than 99.9% of the incoming electromagnetic radiation was absorbed. Hexaferrites are usually used in devices for frequencies of 8–75 GHz. In this work, it is shown that Sn-substituted hexaferrite can be used for electromagnetic shielding and at lower frequencies (for example, in the L-band and S-band) as absorbing materials. The paper defines a solid-state reaction technique for preparing BaFe12−xSnxO19 (0.1 ≤x ≤ 1.2). The samples are characterized by XRD, SEM, VSM, and VNA. The study shows that increasing the Sn-substitution leads to weakening the interaction between the magnetic sublattices. So, in general, the saturation magnetization (Ms) decreases. Low saturation magnetization at high coercivity values gives a high anisotropy field, which provides significant absorption and matching impedance. The sample with substitution of x = 1.2 is the most absorbing sample (more than 99.99% of the incident energy absorbed for 10 mm thickness). The investigated samples have the potential to be useful absorption materials for shielding production (materials that absorb electromagnetic radiation)