Electromagnetic properties and microwave-absorption properties of BaTiO₃/BaZn₂Fe₁₆O₂₇ composite in 2–18 GHz

Abstract

BaTiO₃/BaZn₂Fe₁₆O₂₇ composites were prepared by traditional solid state method, BaTiO₃ nano particles were coated around with the BaZn₂Fe₁₆O₂₇ ferrite with hexagonal plate structure. The prepared composite particles were characterized with X-ray diffraction, scanning electron microscopy, and vector network analyzer. With the increase of BaTiO₃ content, the complex permittivity of the composites increases, while the complex permeability decreases; The sharp peaks of the magnetic loss appear at 8.72 and 14.0 GHz, and the peak values are 1.64 and 0.69, respectively, when the mole ratio of BaZn₂Fe₁₆O₂₇/BaTiO₃ is 10:5; The matching thickness of BaTiO₃/BaZn₂Fe₁₆O₂₇ composites is 2.5 mm when the mole ratio of BaZn₂Fe₁₆O₂₇/BaTiO₃ is 10:5, and the minimum reflection loss reaches −33.49 dB at 8.56 GHz; There are more than one loss peak appeared in the reflection loss cures, and the effective absorption frequency (RL < −10 dB) ranges from 7.92 to 14.96 GHz with a thickness of 3 mm.