In this research, fine nanoparticles of Ni_xFe_3−xO₄ with Ni concentration up to x = 1.5 were synthesized via a simple one-step capping agent-free co-precipitation route. The effect of Ni substitution was investigated by details using X-ray diffractometer, transmission electron microscope, Fourier transform infrared and UV–Vis spectroscope, and vibrating sample magnetometer. The structural studies revealed that the particles have good crystallinity with diameters of 7.5–13 nm with cubic spinel structure. The FTIR spectra exhibiting a doublet band around 600 cm⁻¹ confirms further the mixed spinel structure. It was found that the involved nanoparticles are indirect band gap materials that controlled by the size effect rather than the influence of the chemical composition. The magnetic characterization showed that the nanoparticles are superparamagnetic at room temperature with the superior saturation magnetizations of about 68–70.5 emu/g; the size effects dominate the influence of the sites occupancy in controlling the magnetization values, as well.

在这项研究中，通过简单的无一步封帽剂共沉淀途径合成了Ni浓度高达x = 1.5的Ni _x Fe _3-x O ₄细颗粒。使用X射线衍射仪，透射电子显微镜，傅立叶变换红外和UV-Vis光谱仪以及振动样品磁强计，详细研究了Ni替代的影响。结构研究表明，颗粒具有良好的结晶度，具有立方尖晶石结构，直径为7.5–13 nm。FTIR光谱在600 cm ^-1附近显示双峰带进一步证实了尖晶石的混合结构。发现所涉及的纳米颗粒是间接带隙材料，其受尺寸效应而不是化学组成的影响控制。磁性表征表明，纳米粒子在室温下为超顺磁性，饱和磁化强度约为68-70.5 emu / g。尺寸效应在控制磁化值方面也支配着位点占据的影响。