Galarreta Itziar, Insausti Maite, Gil de Muro Izaskun, Ruiz de Larramendi Idoia, Lezama Luis
Department of Inorganic Chemistry, University of the Basque Country, UPV/EHU, Bº Sarriena, 48970 Leioa, Spain.
BCMaterials, Basque Center for Materials, Applications & Nanostructures, UPV/EHU Science Park, Bº Sarriena, 48970 Leioa, Spain.
Nanomaterials (Basel). 2018 Jan 25;8(2):63. doi: 10.3390/nano8020063.
With the aim of studying the influence of synthesis parameters in structural and magnetic properties of cobalt-doped magnetite nanoparticles, FeCoO₄ (0 < < 0.15) samples were synthetized by thermal decomposition method at different reaction times (30-120 min). The Co ferrite nanoparticles are monodisperse with diameters between 6 and 11 nm and morphologies depending on reaction times, varying from spheric, cuboctahedral, to cubic. Chemical analysis and X-ray diffraction were used to confirm the composition, high crystallinity, and pure-phase structure. The investigation of the magnetic properties, both magnetization and electronic magnetic resonance, has led the conditions to improve the magnetic response of doped nanoparticles. Magnetization values of 86 emu·g at room temperature (R.T.) have been obtained for the sample with the highest Co content and the highest reflux time. Magnetic characterization also displays a dependence of the magnetic anisotropy constant with the varying cobalt content.
为了研究合成参数对钴掺杂磁铁矿纳米颗粒结构和磁性的影响，采用热分解法在不同反应时间（30 - 120分钟）合成了FeCoO₄（0 < < 0.15）样品。钴铁氧体纳米颗粒呈单分散状态，直径在6至11纳米之间，其形态取决于反应时间，从球形、立方八面体到立方体各不相同。使用化学分析和X射线衍射来确认其组成、高结晶度和纯相结构。对磁性（包括磁化强度和电子磁共振）的研究得出了改善掺杂纳米颗粒磁响应的条件。对于钴含量最高且回流时间最长的样品，在室温下获得了86 emu·g的磁化强度值。磁性表征还显示磁各向异性常数随钴含量的变化而变化。
