中文摘要：

通过引入Cu元素掺杂，利用多元醇还原法在340℃条件下一步制备出L1。相（FePt）1xCux纳米颗粒。实验研究了不同比例Cu掺杂对FePt颗粒形貌、结构及磁性能的影响。X射线衍射结果表明，在未掺杂Cu元素时，FePt颗粒为fcc结构。随着Cu元素的引入，样品逐渐呈现出fct结构的衍射峰，同时出现单质Cu的衍射峰。透射电子显微镜显示Cu掺杂导致制备的纳米颗粒有所长大、颗粒的尺寸分布变宽。磁性测量结果表明，当反应前驱体中Cu的比例为25．9％时，其矫顽力达到约1300Oe。研究显示Cu掺杂对于FePt颗粒在低温下的相变具有一定促进作用。

英文摘要：

L10 structured （FePt）1-xCux nanoparticles （NPs） were directly prepared by polyol method at 340 ℃. The effects of copper additive on the morphology, structure and chemical ordering of as-prepared FePt NPs were investi- gated. X ray diffraction results showed that without Cu doping the as-prepared NPs possessed fcc structure and gradually showed typical fct diffraction peaks after increasing the Cu doping concentration. Meanwhile the metallic Cu phase is observed. TEM images exhibited that as-prepared NPs had bigger particles size and wider particle size distribution after introducing Cu additive. Magnetic properties measurement showed that a coercivity of 1300 Oe was obtained when the molar ratio of Cu reached 25.9% in the （FePt）1-x Cuxnanoparticles. This study indicated Cu do- ping has a certain in promoting the phase-transition of FePt nanoparticles.