The effect of substitution of silver (Ag) on the structural, electric, dielectric and magnetic properties of nano-CoFe₂O₄ synthesized via green synthesis using okra plant extract is investigated. The lattice parameters and inverse spinel structure of Ag-substituted CoFe₂O₄ is confirmed from Rietveld refinement of the x-ray diffraction measurements, Fourier transform infrared (FT-IR) and Raman spectra. A lattice expansion is observed due to the incorporation of larger Ag ions into the CoFe₂O₄ lattice. Field emission scanning electron micrography analyses elucidate the formation of poly-faceted surfaces with reduction in particle size on Ag doping. The temperature dependent impedance and modulus study reveals the presence of relaxation phenomenon which is dependent on frequency and temperature. Frequency dependent dielectric measurements with increasing temperature obey the modified Debye model. Dielectric loss in the negative region for Ag-doped CoFe₂O₄ signifies the change of polarization direction due to an increase of Co²⁺/Fe²⁺ ratio for the substitution of Ag ions in the B site. Magnetic hysteresis curves exhibit a low field hysteresis loop at room temperature indicating the long-range ferromagnetic ordering nature of the samples. Low loss and high dielectric values make these materials a promising candidate for high frequency devices.

研究了银（Ag）的取代对黄秋葵植物提取物绿色合成纳米CoFe ₂ O ₄的结构，电学，介电和磁性能的影响。Ag-取代的CoFe ₂ O ₄的晶格参数和反尖晶石结构通过X射线衍射测量，傅立叶变换红外光谱（FT-IR）和拉曼光谱的Rietveld精制得到证实。由于将较大的银离子掺入CoFe ₂ O _4中，观察到晶格膨胀格子。场发射扫描电子显微镜分析阐明了多面表面的形成，并减少了Ag掺杂时的粒径。温度相关的阻抗和模量研究揭示了松弛现象的存在，该现象取决于频率和温度。随温度升高而随频率变化的介电测量结果遵循改进的Debye模型。掺Ag的CoFe ₂ O ₄在负区域的介电损耗表示由于Co ²⁺ / Fe ²⁺的增加而引起的极化方向的变化。 B位中Ag离子取代的比率。磁滞曲线在室温下表现出低场磁滞回线，表明样品的远距离铁磁有序性。低损耗和高介电值使这些材料成为高频器件的有希望的候选者。