针对尺寸、成分、微观结构和添加元素显著影响单分散FePt纳米颗粒有序化相变动力学的关键科学问题，本项目拟利用高温液相法制备不同尺寸、成分和微观结构的FePt纳米颗粒，通过包覆保护层使有序化相变仅在纳米颗粒内部发生，研究尺寸、成分和微观结构对单分散FePt纳米颗粒有序化相变形核激活能、生长激活能及相变激活体积等动力学参数的影响规律。在此基础上，研究掺入第三种合金元素对FePt纳米颗粒有序化相变动力学及磁性能的影响规律，从相变动力学角度阐明添加合金元素对FePt纳米颗粒有序畴的形核和长大的影响机制；进一步研究添加元素与FePt发生相分离对FePt纳米颗粒有序化相变的影响机制；建立结构演变-有序化相变-磁性能的依赖关系。利用蒙特卡洛方法模拟单个FePt纳米颗粒在不同条件下的相变过程，结合实验结果，探索加速FePt纳米颗粒有序化的合成方法，为液相合成硬磁L10-FePt纳米颗粒提供实验和理论参考。

The size, composition, microstructure and the addition of elements can significantly affect the ordering kinetics of monodisperse FePt nanoparticles. FePt nanoparticles with protective layer which lead to that the orderly transformation occurs only in nanoparticles inside will be prepared by high temperature liquid phase method. The effects of the size, microstructure and composition of the monodisperse FePt nanoparticle on ordering activation energy, nucleation and growth activation energy and activation volume will be researched. The influence of adding third kinds of alloy elements on ordering kinetics and magnetic properties of FePt nanoparticle ordering transformation will be further studied in order to understand the effect of addition elements on ordered domain nucleation and growth mechanism during FePt nanoparticles ordering. The effect of the phase separation between FePt and the third adding element on the ordering transformation will be also discussed. The dependence of the structure evolution-ordering transformation-magnetic properties will be established. Monte Carlo simulation of single FePt nanoparticles ordering under different conditions will be explored. Combined with experimental results, the synthesis method of accelerated FePt nanoparticles ordering will be discussed. The project will provide experimental and theoretical guide for the liquid phase synthesis of hard magnetic L10-FePt nanoparticles.