Effect of reduction-diffusion time on microstructure and properties of Nd-Fe-B nanoparticles prepared by low-energy chemical method. (23rd August 2019)

• Record Type: Journal Article
• Authors: Pei, Wenli; Zhang, Xiaohan; Meng, Qinyu; Zhou, Jifeng; Guo, Yaozu; You, Junhua; Zhao, Dong; Wang, Xiaoyang
• Is Part Of: Materials research express. Volume 6:Number 10(2019)
• Publication Date: 2019-08-23
• Subjects: chemical method -- reductive-diffusion times -- nanoparticles -- microstructure; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/ab366c
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: Nd-Fe-B nanoparticles have been successfully prepared by using an optimized low-energy chemical method. The effects of reduction-diffusion time on the microstructure and properties of Nd-Fe-B nanoparticles were investigated by using TEM, XRD, SEM, VSM and Rietveld calculations. The results showed that when the reduction-diffusion time was short, the reaction was not sufficient, which resulted in a residual H5 Nd2 phase. When the reduction-diffusion time was prolonged, the H5 Nd2 phase gradually decreased and the relative crystallinity of Nd2 Fe14 B phase gradually increased. Moreover, the grain size grew and the rich Nd phase appeared gradually around the grains. Furthermore, as the reduction-diffusion time was prolonged, the coercive force of Nd-Fe-B nanoparticles increased first and then decreased. When the holding time was extended to 180 min, the coercive force reached a maximum of about 4.85 kOe and the magnetic energy product was about 2.5 MGOe.