ABSTRACT

Nanoparticles of nickel-doped iron chromite (Fe_1-xNi_xCr₂O₄) with composition x = 0.2-0.8 have been prepared by the sol–gel method using citric acid as a complexing agent. X-ray diffraction (XRD) results show that the synthesised doped nanoparticles are crystalline. Temperature and concentrations are key variables that influence nanopowder properties. To obtain fine powders, the doped samples were sintered at 750°C for 4 h. Doping was confirmed by XRD patterns. Raman spectra confirmed the existence of both parent and doped compounds. The band gap for the undoped sample is about 4.01 eV which, on doping, decreases to 3.7 eV as determined from photoluminescence spectra. The results suggest that synthesised nanoparticles of Fe_1-xNi_xCr₂O₄ can be used for versatile future applications such as energy storage and photocatalytic activity.

摘要

镍掺杂的亚铬酸铁 (Fe _1-x Ni _x Cr ₂ O ₄ ) 的纳米颗粒，其成分为x = 0.2-0.8 已通过使用柠檬酸作为络合剂的溶胶-凝胶方法制备。X 射线衍射 (XRD) 结果表明合成的掺杂纳米粒子是结晶的。温度和浓度是影响纳米粉末特性的关键变量。为了获得细粉，掺杂的样品在 750°C 下烧结 4 小时。通过 XRD 图案证实了掺杂。拉曼光谱证实了母体和掺杂化合物的存在。根据光致发光光谱确定，未掺杂样品的带隙约为 4.01 eV，掺杂后可降至 3.7 eV。结果表明合成的Fe _1-x Ni _x Cr ₂ O ₄纳米颗粒 可用于多种未来应用，例如能量存储和光催化活性。