Preparation and magnetic properties of Ba0.4Sr1.6Mg2Fe12O22 Y-type hexagonal ferrite
Y-type hexaferrite Ba0.4Sr1.6Mg2Fe12O22 single-phase polycrystalline samples were synthesized by the solid-state reaction method.The crystal structue of Y-type hexaferrite Ba0.4Sr1.6Mg2Fe12O22 was characterized by X-ray diffraction.X-ray diffraction re-sults show the impure phase is M-type hexaferrite when the sintering temperature is 1 120 ℃ to 1 160 ℃,respectively.The single-phase Y-type hexaferrite Ba0.4Sr1.6Mg2Fe12O22 was prepared when the sintering temperature is 1 170 ℃.The microstructure and com-position were analyzed with field emission scanning electron microscope and energy dispersive spectrometer,respectively.Y-type hexaferrite Ba0.4Sr1.6Mg2Fe12O22 shows hexagonal morphology with grain size about 3 µm and small cluster.According to the energy spectrum analysis,the composition of the two forms is the same.The magnetic property was characterized by physical property mea-surement system.Magnetization curves revealed two magnetic transitions at 330 K and 90 K,which corresponded to conical mag-netic ordering and spin-glass phase transition.The conical magnetic phase transitio ordering temperature of Ba0.4Sr1.6Mg2Fe12O22 is higher than the room temperature,which provides the possibility of magnetoelectric coupling at room temperature.
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