Low-temperature-sintering of Co2Z ferrite materials via Dy3+ ion doping for use in high-frequency applications

Abstract

According to this study, Co2Z ferrite is suitable for applications in high-frequency antennas. Ba3Co2Fe24-xDyxO41 samples with different values of Dy3+ doping concentration (x) in the range of 0.00–0.25 were prepared in the study by employing solid-state sintering and 2.5 wt% Bi2O3 sintering aids. A systematic analysis of the physical phase structure, microstructure, and magnetic dielectric properties of the samples was also performed. The X-ray diffraction patterns of the samples showed that doping with Dy3+ ions and the addition of the Bi2O3 sintering aid had not changed the physical structure of the sample material, indicating that the material was still a Z-type hexagonal ferrite. In addition, according to the magnetic hysteresis loops of the samples, all six groups of them exhibited typical soft magnetic properties. With an increase in the Dy3+ ion doping concentration, the saturation magnetization intensity and coercivity of the samples initially increased and then decreased. The sample with a Dy3+ ion doping concentration of 0.15 had the most uniform grain distribution, largest density, and smallest porosity among the samples. Additionally, that sample had the maximum values of the real parts of the magnetic permeability (7.89) and permittivity (13.90) while having a low magnetic loss (tanδμ≤0.04) and a low dielectric loss (tanδε≤0.03). Thus, this type of magnetic dielectric materials will have significant potential for use in high-frequency antenna applications.