Synthesis of Ce-Based <i>RE</i><sub>2</sub>Fe<sub>14</sub>B by Solid-State Reaction and Reduction-Diffusion Process

Synthesis of Ce-Based <i>RE</i><sub>2</sub>Fe<sub>14</sub>B by Solid-State Reaction and Reduction-Diffusion Process

Rare-earth permanent magnets, such as Nd<sub>2</sub>Fe<sub>14</sub>B, have been widely used in electric vehicle and wind turbine motors due to their high anisotropy field (<i>H</i><sub>a</sub>), saturation magnetization (<i>M</i><sub>...

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Bibliographic Details
Main Authors:	Sunwoo Lee, Kanghyuk Lee, Young-Min Kang, Jung-Woo Lee, Jihoon Park, Sang-Im Yoo, Chan Park
Format:	Article
Language:	English
Published:	MDPI AG 2024-12-01
Series:	Applied Sciences
Subjects:	Ce<sub>2</sub>Fe<sub>14</sub>B reduction-diffusion process solid-state reaction 2-14-1 phase rare-earth magnet
Online Access:	https://www.mdpi.com/2076-3417/14/23/11253
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Summary:	Rare-earth permanent magnets, such as Nd<sub>2</sub>Fe<sub>14</sub>B, have been widely used in electric vehicle and wind turbine motors due to their high anisotropy field (<i>H</i><sub>a</sub>), saturation magnetization (<i>M</i><sub>s</sub>) and coercivity (<i>H</i><sub>c</sub>). Cerium (Ce) has gained attention as a potential alternative to neodymium (Nd) due to its high abundance and low cost. The relatively poor intrinsic magnetic properties of Ce magnets, however, remain a significant challenge for their industrial applications. In this study, the synthesis of Ce-based <i>RE</i><sub>2</sub>Fe<sub>14</sub>B (2-14-1) phases was achieved by a modified reduction-diffusion (R-D) process using <i>RE</i>FeO<sub>3</sub> (<i>RE</i> = Ce, Nd) as a precursor. The precursor was prepared by a solid-state reaction with CeO<sub>2</sub>, Nd<sub>2</sub>O<sub>3</sub>, Fe<sub>2</sub>O₃ and Fe powders, which is a much more suitable process for mass production and cost-effectiveness. Optimal composition and heat treatment conditions enabled the formation of single-phase Ce-based 2-14-1 particles. The as-synthesized single-phase Ce<sub>2</sub>Fe<sub>14</sub>B particles exhibited an <i>M</i><sub>s</sub> value of ~120 emu/g and an intrinsic coercivity (<i>H</i><sub>ci</sub>) value of ~85 Oe, which can be attributed to the large particle size as observed by FE-SEM.
ISSN:	2076-3417