Evolution of microstructure and formation mechanism of Nd-Fe-B nanoparticles prepared by low energy consumption chemical method. Issue 68 (19th November 2018)

• Record Type: Journal Article
• Authors: Guo, Yaozu; Zhao, Dong; You, Junhua; Pei, Wenli; Qu, Yingdong; Wang, Xiaoyang; Meng, Qingyu
• Is Part Of: RSC advances. Volume 8:Issue 68(2018)
• Page Start: 38850
• Page End: 38859
• Publication Date: 2018-11-19
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c8ra08271e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The Nd-Fe-B intermediate was successfully prepared by using a low-energy chemical method. Abstract : Nd2 Fe14 B nanoparticles were successfully prepared by using a low-energy chemical method. The microscopic characteristics and formation mechanisms of the phases were investigated at each stage during the preparation of Nd-Fe-B nanoparticles. The Nd-Fe-B intermediates, Nd-Fe-B oxides and reduced Nd-Fe-B nanoparticles were detected and analyzed by using TEM, STEM, XRD, SEM, VSM and Rietveld calculations. The results showed that the intermediate of Nd-Fe-B consisted of Fe3 O4 and Nd and Fe elements surrounded by nitrile organic compounds. The Nd-Fe-B oxide was composed of NdFeO3 (48.619 wt%), NdBO3 (31.480 wt%) and α-Fe (19.901 wt%), which was formed by the reaction among Nd, Fe3 O4 and B2 O3 . NdFeO3 and NdBO3 exhibited a perovskite-like lamellar structure, and the grain size was smaller than that of α-Fe. Nd-Fe-B particles were mainly composed of Nd2 Fe14 B and α-Fe phases. The small particles of NdFeO3 and NdBO3 and the interstitial position between oxide particles and α-Fe were more favorable for the formation of Nd2 Fe14 B particles. At the same time, the surface of α-Fe particles can also diffuse to form Nd2 Fe14 B nanoparticles. The coercivity of Nd-Fe-B particles was 5.79 kOe and the saturation magnetization was 63.135 emu g −1 .