Effects of dysprosium substitution on the structure, magnetic properties and microwave absorption properties of Z-type hexaferrite Ba3Co2Fe24O41 synthesized by the sol–gel method

Abstract

Rare earth dysprosium-doped Ba3Co2Fe24-xDyxO41 (x = 0.00, 0.02, 0.04, 0.06, 0.08, 0.10) Z-type hexaferrites were successfully prepared by employing the sol–gel method. The effects of Dy doping on the crystal structure, morphology, magnetic properties at room temperature, high-frequency electromagnetic properties and electromagnetic wave absorption performance of Co2Z hexaferrite were studied in detail. The results show that with the increase in the rare earth Dy doping amount, the value of the saturation magnetization (Ms) also increases, and the value of the coercivity of the sample is approximately 15 Oe, indicating that it has excellent soft magnetic properties. The high-frequency magnetoelectric parameters were characterized. The material with x = 0.04 exhibits the best microwave absorption performance when the thickness is t = 3.4 mm, and the reflection loss is −64.21 dB. When x = 0.08, the effective absorption bandwidth (RL ≤ -10 dB) of the material is between 4.33 GHz and 10.48 GHz, reaching 6.15 GHz. Compared with multielement doping and multicomponent composite materials, the preparation method of the wave absorbing material is simple and facile. The material has potential application prospects in the field of microwave absorption in the GHz band.

Keywords

• Z-type hexaferrite
• Rare earth substitution
• High frequency microwave absorption
• Effective absorption bandwidth