Cherpin Chloé, Lister Derek, Dacquait Frédéric, Liu Lihui
Commissariat à L'énergie Atomique et aux Énergies Alternatives, Institut de Recherche sur les Systèmes Nucléaires pour la Production D'énergie Bas Carbone, Département de Technologie Nucléaire Cadarache, F-13108 Saint-Paul-Lez-Durance, France.
Chemical Engineering Department, University of New Brunswick, P.O. Box 4400, Fredericton, NB E3B 5A3, Canada.
Materials (Basel). 2021 May 14;14(10):2557. doi: 10.3390/ma14102557.
Spinel ferrite compounds continue to receive a lot of attention due to their unique properties. Among the numerous synthesis routes existing, the solid-state method was applied for the production of nickel ferrite, by introducing the use of a quartz vial. A mixture of nickel oxide (NiO) and hematite (FeO) was ground and vacuum-sealed in the vial and different thermal treatment programs were tested. The resulting particles were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectroscopy. For temperatures, below 1000 °C, the solid-state reaction is not complete as nickel oxide (NiO) and hematite (FeO) are still present. The reaction time is a decisive parameter for the morphology of the particles obtained. If, for different reaction times, the particle size distribution is always between 0.3 and 1.7 µm, a longer reaction time leads to the formation of dense, interconnected clusters of particles. Optimal parameters to synthesize a pure phase of spherical nickel ferrite were sought and found to be a reaction temperature of 1000 °C for 72 h.
由于其独特的性能，尖晶石铁氧体化合物一直备受关注。在现有的众多合成路线中，通过引入石英瓶的使用，采用固态法来制备镍铁氧体。将氧化镍（NiO）和赤铁矿（Fe₂O₃）的混合物研磨后真空密封在瓶中，并测试了不同的热处理程序。通过X射线衍射（XRD）、扫描电子显微镜（SEM）和拉曼光谱对所得颗粒进行了表征。对于低于1000℃的温度，由于氧化镍（NiO）和赤铁矿（Fe₂O₃）仍然存在，固态反应不完全。反应时间是所得颗粒形态的决定性参数。如果在不同的反应时间下，粒径分布始终在0.3至1.7μm之间，较长的反应时间会导致形成致密、相互连接的颗粒簇。人们寻求并发现合成纯相球形镍铁氧体的最佳参数为反应温度1000℃，反应时间72小时。
