Molybdenum substituted M-type hexagonal barium ferrite for high microwave absorption performance

With the advancement of electrical and electronic devices, overcoming electromagnetic pollution turns into an urgent problem. In this work, high-valence molybdenum (Mo6+) was doped into M-type hexagonal barium ferrite (BaFe12-xMoxO19) to improve its electromagnetic performance. The relationship between the Mo6+ doping concentration and the crystallographic structure, morphology and electromagnetic properties was studied in detail. Structural characterizations authenticate that the Mo6+ ions prefer the 2b site, increasing the lattice values and grain size, and boosting more Fe3+ conversion into Fe2+. The magnetic hysteresis loops demonstrate a reduction of saturation magnetization and coercivity values with the increase of Mo6+ concentration. While the microwave absorption properties were obviously improved by the doping Mo6+, and obtained the highest RLmin value of -56.12 dB@16.1 GHz and effective absorption bandwidth of 4.2 GHz at x = 0.1, displaying a potential role in absorbing material.