Abstract
In this study, Sr–Ba hexaferrite nanoparticles ( ${\text {Ba}}_{\mathrm {0.5}}{\text {Sr}}_{\mathrm {0.5}}{\text {Ni}}_{\mathrm {2-}x}\left (\text {MgZn} \right )_{\frac {x}{\mathrm {2}}} {\text {Fe}}_{\mathrm {16}}\mathrm {O}_{\mathrm {27}}$ , x = –0.6, in the step of 0.2) was synthesized by the sol-gel method. The influence of Mg–Zn substitution on the structure and microwave absorption properties of Ni–W-type hexaferrite were investigated by technical methods such as x-ray diffraction, vector network analyzer, transmission electron micrograph and vibrating sample magnetometer. TEM images illustrated almost spherical particles with an average size of 35–52 nm. The M–H loops for all samples were measured at room temperature by vibrating sample magnetometer. Saturation magnetization (Ms) and coercivity (Hc) were derived from the hysteresis loops. The maximum field used in this measurement was 9 kilo-Oersted (kOe) Finally, the microwave absorption properties of these samples were investigated in Ku band range. The thickness of the composites was 2 mm in microwave absorption measurements. The results showed that the synthesized samples have a great potential in many fields of industry.
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