Nanocrystalline nickel-deficient ferrites have been prepared by a facile co-precipitation method using different Fe/Ni ratios. The obtained powders were studied by X-ray diffraction (XRD), scanning electron microscopy equipped with energy-dispersive X-ray spectrometry, Raman spectrometry, and vibrating sample magnetometer. The XRD results reveal the formation of a nonstoichiometric NiFe₂O₄-type spinel structure with a lattice parameter in the range of 8.353–8.364 Å and an average crystallite size that varies between 51 and 64 nm. The Rietveld refinement shows that the Fe/Ni ratio increases with the increase in Fe content and the obtained structures are nickel-deficient ferrites. Five characteristic vibration modes of the spinel structures have been observed in the Raman spectra. The saturation magnetization values are in the range of 40.14–69.29 emu/g and the coercivity lies between 185 and 200 Oe. According to the Mr/Ms squareness ratio values (0.239–0.265), the spinel ferrites fall into the pseudo-single domain.

纳米晶缺镍铁氧体已通过使用不同 Fe/Ni 比率的简便共沉淀方法制备。通过X射线衍射（XRD），配备能量色散X射线光谱法，拉曼光谱法和振动样品磁强计的扫描电子显微镜研究获得的粉末。XRD 结果表明形成了非化学计量的 NiFe ₂ O ₄型尖晶石结构，晶格参数在 8.353–8.364 Å 范围内，平均微晶尺寸在 51 到 64 nm 之间变化。Rietveld 细化表明，Fe/Ni 比随着 Fe 含量的增加而增加，得到的结构是缺镍铁素体。在拉曼光谱中已经观察到尖晶石结构的五种特征振动模式。饱和磁化强度值在 40.14-69.29 emu/g 范围内，矫顽力在 185 和 200 Oe 之间。根据M r/ M s 矩形比值 (0.239–0.265)，尖晶石铁氧体属于伪单畴。