Departamento de Química Física Aplicada, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, Spain.
Nanotechnology. 2012 Sep 7;23(35):355708. doi: 10.1088/0957-4484/23/35/355708. Epub 2012 Aug 16.
Uniform size cobalt ferrite nanoparticles have been synthesized in one step using an electrochemical technique. Synthesis parameters such as the current density, temperature and stirring were optimized to produce pure cobalt ferrite. The nanoparticles have been investigated by means of magnetic measurements, Mössbauer spectroscopy, x-ray powder diffraction and transmission electron microscopy. The average size of the electrosynthesized samples was controlled by the synthesis parameters and this showed a rather narrow size distribution. The x-ray analysis shows that the CoFe(2)O(4) obtained presents a totally inverse spinel structure. The magnetic properties of the stoichiometric nanoparticles show ferromagnetic behavior at room temperature with a coercivity up to 6386 Oe and a saturation magnetization of 85 emu g(-1).
已使用电化学技术一步合成了具有均匀尺寸的钴铁氧体纳米粒子。通过优化电流密度、温度和搅拌等合成参数，成功制备出了纯钴铁氧体。通过磁测量、穆斯堡尔光谱、X 射线粉末衍射和透射电子显微镜对纳米粒子进行了研究。电合成样品的平均尺寸受合成参数的控制，且表现出相当窄的尺寸分布。X 射线分析表明，所获得的 CoFe(2)O(4) 呈现完全反尖晶石结构。化学计量纳米粒子的磁性在室温下表现出铁磁性，矫顽力高达 6386 Oe，饱和磁化强度为 85 emu g(-1)。
