Rare earths (REs) play a key role in distorting spinel structure by creating some defects at the lattice sites and make them suitable for magnetodielectric applications. In the present study, the nanoferrites of CuRE_0.02Fe_1.98O₄, where REs = Y³⁺, Yb³⁺, Gd³⁺, were prepared using one step sol–gel method. The prepared samples are copper ferrite (CFO), yttrium doped copper ferrite (Y-CFO), ytterbium doped copper ferrite (Yb-CFO) and gadolinium doped copper ferrite (Gd-CFO), respectively. The single-phase structure of all the REs doped nanoferrites was determined by X-ray diffraction (XRD) analysis. The porosity, agglomerations and grain size of the REs doped copper ferrite were examined using field emission scanning electron microscopy (FESEM) analysis. Fourier transform infrared spectroscopy (FTIR) elaborates the phase formation and environmental effects on the REs doped nanoparticles (NPs). The recorded room temperature M−H loops from a vibrating sample magnetometer (VSM) elucidate the magnetic properties of the REs doped spinel nanoferrites. The magnetic saturation (M_s) was calculated in the range of 23.08 to 51.78 emu/g. The calculated coercivity values (272.6 to 705.60 Oe) confirm the soft magnetic behavior of REs doped copper ferrites. Furthermore, the electromagnetic and dielectric properties were assessed using a Vector network analyzer (VNA) from 1 to 6 GHz. The permeability, permittivity, dielectric tangent loss and electric modulus of the REs doped spinel ferrites illustrate that the prepared NPs may be suitable for microwave and high frequency applications.

稀土 (RE) 通过在晶格位置产生一些缺陷并使其适用于磁电介质应用而在扭曲尖晶石结构方面发挥着关键作用。在本研究中，CuRE _0.02 Fe _1.98 O ₄的纳米铁氧体，其中 REs = Y ³⁺ , Yb ³⁺ , Gd ³⁺, 使用一步溶胶-凝胶方法制备。制备的样品分别为铁氧体铜(CFO)、掺钇铁氧体(Y-CFO)、掺镱铁氧体铜(Yb-CFO)和掺钆铁氧体铜(Gd-CFO)。所有稀土掺杂的纳米铁氧体的单相结构都通过 X 射线衍射 (XRD) 分析确定。使用场发射扫描电子显微镜 (FESEM) 分析检查了 REs 掺杂的铁氧体铜的孔隙率、团聚和晶粒尺寸。傅里叶变换红外光谱 (FTIR) 详细阐述了 REs 掺杂纳米粒子 (NPs) 的相形成和环境影响。记录的室温M − H来自振动样品磁力计 (VSM) 的回路阐明了 REs 掺杂尖晶石纳米铁氧体的磁性。计算出的磁饱和度 ( M _s ) 范围为 23.08 至 51.78 emu/g。计算出的矫顽力值（272.6 至 705.60 Oe）证实了掺有稀土元素的铜铁氧体的软磁行为。此外，使用矢量网络分析仪 (VNA) 从 1 到 6 GHz 评估电磁和介电特性。REs 掺杂尖晶石铁氧体的磁导率、介电常数、介电正切损耗和电模量表明制备的 NPs 可能适用于微波和高频应用。