Direct Synthesis of <i>L</i>1<sub>0</sub>-FePt Nanoparticles with High Coercivity via Pb Addition for Applications in Permanent Magnets and Catalysts
Wenli Pei, Dong Zhao, Chun Wu, Zhimeng Sun, Chunhong Liu, Xiaoyang Wang, Jian Zheng, Miaomiao Yan, Jianjun Wang, Qiang Wang
Abstract
We report a promising strategy to directly synthesize L10-FePt nanoparticles for applications in permanent magnets and catalysts. The element Pb with lower melting point, smaller surface energy, and a bigger atomic radius can improve migration of Fe and Pt atoms and promote orderly diffusion in the L10-FePt nanoparticles by generating vacancies and lattice distortion. The ordering degree and magnetic properties of the nanoparticles can be tuned by changing the molar ratios of Pb/Pt and removing Pb from the nanoparticles. The ultrahigh ordering degree and a coercivity of up to 20.95 kOe were achieved by using a suitable Pb/Pt ratio after removing Pb.