Investigation of the magnetodielectric properties of (1−x)Y3Fe5O12-xBaTiO3 composite ceramics

To satisfy the combined magnetic and dielectric requirements of electromagnetic materials for modern communication systems, (1- x )Y 3 Fe 5 O 12 - x BaTiO 3 (YIG-BTO) multiphase ceramics were prepared via a conventional ceramic processing method. The phase composition, element distribution, microstructure, and magnetic and dielectric properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometry (VSM), and a precision impedance analyzer. The results indicate that, at the microscale, the YIG and BTO phases coexist uniformly within the YIG-BTO composite ceramics. The microstructure, relative density, and grain size of the YIG-BTO ceramics are closely related to the BTO content, which in turn synergistically affects their magnetodielectric properties. For the 90 wt% YIG-10 wt% BTO ceramic sample with a relative density ( ρ r ) exceeding 95%, an optimal overall magnetodielectric performance is achieved. At 100 kHz, the initial permeability ( μ′ ) is 39.08, the magnetic loss ( tanδ μ ) is 0.1, the dielectric constant ( ε r ) is 29.32, the dielectric loss ( tanδ ε ) is 0.071, and the saturation magnetization ( 4πMs ) is 1563.67 Gs. This study provides a systematic theoretical basis for the practical application of the promising YIG-BTO multiphase material system.