In the present investigation, pristine nickel oxide (NiO) and cobalt oxide (Co₃O₄) nanoparticles have been synthesised by well pronounced sol-gel auto combustion route. A series of Co₃O₄-NiO nanocomposite with varying NiO concentration from 10% to 40% by weight to Co₃O₄, has been synthesised using sonochemical route. A qualitative study of structural, optical and magnetic properties of the nanocomposite series of Co₃O₄-NiO was performed by analysing X-Ray Diffraction, Raman Spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), Ultra violet Diffuse Reflectance Spectroscopy (UV-DRS), Transmission Electron Microscopy (TEM), X-Ray Photoelectron Spectroscopy (XPS) and Vibrating Sample Magnetometer (VSM) as well as electron paramagnetic resonance (EPR). From XRD measurements, crystalline phases of pure NiO, Co₃O₄ and their composites have been confirmed. The crystallite sizes determined by Debye Scherer and Williamson Hall methods were found in good agreement. The interplanar spacing has been calculated using HRTEM images for the synthesised samples. Raman analysis confirms the presence of bands and witnesses the formation of the pure and composite samples. From VSM measurements at room temperature M-H curves witnessed the weak ferromagnetism along antiferromagnetic portion in the samples of NiO & Co₃O₄-NiO nanocomposites whereas Co₃O₄ is purely antiferromagnetic. Moreover, EPR measurements confirms the presence of unpaired electrons and field resonance decreases with increase in g value with increasing NiO concentration in the composite samples as compared to NiO sample.

在本研究中，已通过明显的溶胶-凝胶自燃路线合成了原始氧化镍（NiO）和氧化钴（Co ₃ O ₄）纳米粒子。一系列的Co ₃ ö ₄用由10％的NiO不同浓度至40％（重量）对Co -NiO纳米复合材料₃ ö ₄，一直使用的声化学合成路线合成。定性研究Co ₃ O ₄纳米复合材料系列的结构，光学和磁性-NiO通过分析X射线衍射，拉曼光谱，傅立叶变换红外光谱（FTIR），紫外扩散反射光谱（UV-DRS），透射电子显微镜（TEM），X射线光电子光谱（XPS）和振动进行样品磁强计（VSM）以及电子顺磁共振（EPR）。根据XRD测量，纯NiO，Co ₃ O _4的晶相其复合材料已得到确认。发现由Debye Scherer和Williamson Hall方法确定的微晶尺寸非常吻合。使用合成样品的HRTEM图像计算了晶面间距。拉曼分析证实了条带的存在并见证了纯样品和复合样品的形成。从VSM在室温下MH曲线测量目睹沿反铁磁性部分的弱铁磁性的NiO＆Co的样品中的₃ ö ₄ -NiO纳米复合材料，而共₃ ö ₄完全是反铁磁性的。此外，EPR测量结果证实，与NiO样品相比，随着复合样品中NiO浓度的增加，随着g值的增加，不配对电子的存在和场共振随g值的增加而减小。