Synthesis of NdFeB Magnetic Particles With High (BH)max From Their Optimized Oxide Powders Through Reduction–Diffusion Method

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-03-30 DOI:10.1109/LMAG.2022.3178667

Rambabu Kuchi;Vitalii Galkin;Seunghyun Kim;Jong-Ryul Jeong;Soon-jik Hong;Dongsoo Kim

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引用次数: 1

Abstract

Neodymium–iron–boron (NdFeB) magnetic particles with high ( BH ) _max were obtained using optimized ball-milled (BM) NdFeB oxide powders, instead of unmilled NdFeB oxide powders, through combined chemical processes comprising the spray drying and reduction-diffusion (RD) methods. The NdFeB oxide particles were subjected to the BM process to control their structural properties, including shape and size of the particles. The oxide powders were critical to make the NdFeB magnetic particles with enhanced properties by the RD process. In general, the controlled structural properties of the NdFeB oxide particles have a significant impact on the properties of final NdFeB magnetic particles. This has been explored through the NdFeB magnetic particles synthesized by utilizing BM oxide powders (0, 1, 2, and 4 h) at different time intervals. One-hour BM oxide powders yielded NdFeB magnetic particles with higher magnetic properties: ( BH ) _max of 14.06 MG·Oe, coercivity ( H_C ) of 3.9 kOe, and remanence ( M_R ) of 101 emu/g. This was attributed to minimal shape defects and phase purity with high crystallinity for the optimized BM oxide powders. Thus, NdFeB oxide particles directed the final intermetallic NdFeB magnetic particles structural properties, which strongly affected their magnetic properties. This study on oxide powders BM will be useful for the preparation of other intermetallic alloys with enhanced properties.

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还原-扩散法制备高（BH）max NdFeB磁性粒子

使用优化的球磨（BM）NdFeB氧化物粉末代替未研磨的NdFeB氧化粉末，通过包括喷雾干燥和还原扩散（RD）方法在内的组合化学工艺，获得了具有高（BH）max的钕铁硼（NdFeB）磁性颗粒。对NdFeB氧化物颗粒进行BM工艺以控制其结构性质，包括颗粒的形状和尺寸。氧化物粉末对于通过RD工艺制备性能增强的NdFeB磁性颗粒至关重要。通常，NdFeB氧化物颗粒的受控结构性能对最终NdFeB磁性颗粒的性能有显著影响。这已经通过在不同时间间隔使用BM氧化物粉末（0、1、2和4h）合成的NdFeB磁性颗粒进行了探索。经过1小时的BM氧化物粉末制备出具有较高磁性的NdFeB磁性粒子：（BH）max为14.06 MG·Oe，矫顽力（HC）为3.9kOe，剩磁（MR）为101emu/g。这归因于优化的BM氧化物粉末的最小形状缺陷和具有高结晶度的相纯度。因此，NdFeB氧化物颗粒指导了最终的金属间NdFeB磁性颗粒的结构性能，这强烈影响了它们的磁性性能。对氧化物粉末BM的研究将有助于制备其他具有增强性能的金属间合金。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.