Traditional ferrites are of poor electromagnetic wave (EMW) absorption while doping rare earth elements (REEs) can greatly enhance their permeability to improve the EMW loss performance. In this study, Co-Zn ferrite nanoparticles doped with various amounts of REEs (Gd³⁺, Nd³⁺ and Pr³⁺) were synthesized by a hydrothermal method, and their particle morphology and an EMW absorption performance were characterized by using transmission electron microscopy (TEM) and a Vector network analyzer (VNA). The results show that the initial spherical Co-Zn ferrite nanoparticles present an irregular quadrilateral structure after Gd³⁺ doping, and the average particle size of Co_0.5Zn_0.5−xGd_xFe₂O₄ increases from 26 to 50 nm with x increasing from 0 to 0.35. At x of 0.25, the reflectivity absorbance achieves −27.94 dB at 18 GHz with the effective absorption bandwidth (EAB) of 4.08 GHz at a sample thickness of 2.5 mm. When Nd³⁺ doping amount reaches x = 0.3, the minimum reflection loss (RL) is −25.63 dB at 18 GHz and EAB is 3.91 GHz. Doping Pr³⁺ (x = 0.25) in the sample broadens EAB, and the minimum RL is −16.1 dB at 16.81 GHz and EAB is 7.31 GHz. This study shows that the magnetic moment produced by doping REES can form magnetic domains, which affects the incident EMW and improves the magnetic loss. It is expected that REEs-doped Co-Zn ferrite nanoparticles can be used as efficient electromagnetic shielding materials in aerospace.

传统铁氧体对电磁波（EMW）的吸收较差，而掺杂稀土元素（REE）可以大大提高其磁导率，从而改善EMW损耗性能。本研究采用水热法合成了掺杂不同量稀土元素（Gd ³⁺、Nd ³⁺和Pr ³⁺）的Co-Zn铁氧体纳米颗粒，并利用透射电子表征了其颗粒形貌和EMW吸收性能。显微镜 (TEM) 和矢量网络分析仪 (VNA)。结果表明，初始球形Co-Zn铁氧体纳米粒子在Gd ³⁺掺杂后呈现不规则的四边形结构，Co _0.5 Zn _{0.5- x}的平均粒径随着x从0增加到0.35，Gd _x Fe ₂ O ₄从26增加到50nm 。在x为 0.25 时，反射率吸收率在 18 GHz 下达到 -27.94 dB，有效吸收带宽 (EAB) 为 4.08 GHz，样品厚度为 2.5 mm。当 Nd ³⁺掺杂量达到x  = 0.3 时，18 GHz 下的最小反射损耗 (RL) 为 -25.63 dB，EAB 为 3.91 GHz。掺杂 Pr ³⁺ ( x = 0.25) 样本中的 EAB 加宽，最小 RL 在 16.81 GHz 为 -16.1 dB，EAB 为 7.31 GHz。该研究表明，掺杂REES产生的磁矩可以形成磁畴，从而影响入射EMW并改善磁损耗。预计稀土掺杂的Co-Zn铁氧体纳米粒子可作为航空航天领域的高效电磁屏蔽材料。