Lanthanum substituted Mg–Ni–Cu–Co ferrite nanoparticles prepared through the Sol-Gel method were studied using different methods such as XRD, FTIR, UV-VIS, SEM, Raman, LCR, EDX and IV to evaluate the structural, optical and electrical properties. The single-phase cubic spinel structure of the prepared samples was confirmed from X-ray diffraction analysis. The FT-IR spectra indicated two absorption bands, ν₁ and ν₂ that represent the complex Fe³⁺–O²⁻ at A-site (tetrahedral) and B-site (octahedral) vibration. The optical band gap decreased from 2.48eV to 1.53eV observed by UV–Vis, and matched with the electrical resistivity measurements. Variation in the lattice parameters from XRD, the absorption band (octahedral) from FTIR, the optical energy band gap from the UV–vis data and the DC resistivity demonstrated change in structural, optical and electric properties of Mg–Ni–Cu–Co ferrites nanoparticles due to the addition of the rare earth element La³⁺. Both the dielectric losses and dielectric constant of the prepared samples decreased due to the La³⁺ ions doping, and A.C conductivity increased with increasing the value of frequency from 8 Hz to 8 M Hz. The variation in Raman peaks reveals that Raman shift varied due to the La³⁺ addition. EDX data confirmed the stoichiometric calculations of La³⁺ions substituted into Mg–Ni–Cu–Co ferrite nanoparticles.

使用XRD，FTIR，UV-VIS，SEM，拉曼，LCR，EDX和IV等不同方法研究了通过溶胶凝胶法制备的镧取代的Mg-Ni-Cu-Co铁氧体纳米粒子，以评估其结构，光学和电学性质。属性。通过X射线衍射分析证实了所制备样品的单相立方尖晶石结构。的FT-IR谱图显示两个吸收带，ν ₁和ν ₂表示复杂的Fe ³⁺ -O ^2-在A部位（四面体）和B部位（八面体）振动。通过UV-Vis观察到的光学带隙从2.48eV降低到1.53eV，并与电阻率测量值相匹配。XRD的晶格参数，FTIR的吸收带（八面体），UV-vis数据的光能带隙和DC电阻率的变化表明Mg-Ni-Cu-Co铁氧体的结构，光学和电学性质发生了变化由于添加了稀土元素La ³⁺而形成的纳米颗粒。制备的样品的介电损耗和介电常数均由于La ³⁺离子的掺杂而降低，并且交流电导率随频率值从8 Hz增加到8 M Hz而增加。拉曼峰的变化表明拉曼位移由于La³⁺。EDX数据证实了被Mg-Ni-Cu-Co铁氧体纳米粒子取代的La ³⁺离子的化学计量计算。