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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L10相(FePt)1-xCux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。
By introducing Cu element doping, the L10 phase (FePt) 1-xCux nanoparticles were prepared in one step by polyhydric alcohol reduction method at 340 ℃. The effects of different proportions of Cu doping on the morphology, structure and magnetic properties of FePt particles were investigated experimentally. X-ray diffraction results show that, in the undoped Cu element, FePt particles fcc structure. With the introduction of Cu element, the sample gradually shows the diffraction peak of fct structure, at the same time, the diffraction peak of elemental Cu appears. Transmission electron microscopy showed that Cu doping resulted in the growth of the prepared nanoparticles and broadened the size distribution of the particles. Magnetic measurements show that when the proportion of Cu in the reaction precursor is 25.9%, the coercive force reaches about 1300 Oe. The results show that Cu doping can promote the transformation of FePt particles at low temperature.