MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China.
Nanoscale. 2017 Sep 14;9(35):12855-12861. doi: 10.1039/c7nr04849a.
It is extremely desirable but challenging to develop a facile solution phase synthesis to directly prepare well-dispersed L1-FePt nanoparticles (NPs) to meet the requirements of advanced magnets in modern industry and information technology. Here, we report a novel strategy to synthesize hard magnetic L1-FePt NPs via controlled co-reduction of Fe(acac) and KPtCl in the presence of oleylamine, in which effective control of the magnetic properties and chemical ordering of L1-FePt NPs was achieved by tuning the mole ratio of the precursors, reaction time and temperature. The highest coercivity of 10.5 kOe can be obtained for the NPs synthesized at 350 °C for 8 h, which is much higher than the coercivities reported by the previous studies on solution-synthesized FePt NPs without annealing or the third elemental additive. The reported one-pot synthesis of L1-FePt NPs may provide an ideal class of building blocks for magnetic energy applications.
开发一种简便的溶液合成方法直接制备分散良好的 L1-FePt 纳米颗粒（NPs）以满足现代工业和信息技术中先进磁铁的要求，这是非常可取的，但具有挑战性。在这里，我们报告了一种通过在油胺存在下控制共还原 Fe(acac)和 KPtCl 来合成硬磁 L1-FePt NPs 的新策略，其中通过调整前体的摩尔比、反应时间和温度，可以有效控制 L1-FePt NPs 的磁性和化学有序性。在 350°C 下反应 8 小时合成的 NPs 具有最高的矫顽力 10.5 kOe，明显高于以前报道的未经退火或添加第三元素的溶液合成 FePt NPs 的矫顽力。所报道的 L1-FePt NPs 的一锅合成可能为磁能应用提供了一类理想的构建块。
