Effect of Terbium addition on the coercivity of the sintered NdFeB magnets |
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| Authors: | PAN Minxiang ZHANG Pengyue LI Xianjun GE Hongliang WU Qiong JIAO Zhiwei LIU Tingting |
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| Affiliation: | Department of Materials Science and Engineering,China Jiliang University;Beijing Research Institute of Mechanical & Electrical Technology |
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| Abstract: | The effects of Tb addition on the microstructure and magnetic properties of the NdFeB magnets prepared by HD method were investigated by X-ray diffraction(XRD) and BH magnetometers.The results of the microstructure showed that both the Tb-doped and undoped permanent magnets were composed mostly of Tetragonal phase Nd2Fe14B(space group P42/mnm) and a trace amount of Nd-rich phase.Accordingly,addition of Tb led to a decrease of the pole density factor of(004),(006) and(008) crystal plane of the Nd2Fe14B phase calculated by Horta formula,but the coercivity of the magnets increased from 2038 kA/m up to 2302 kA/m as a consequence of Tb addition.The study of the Hc(T)/Ms(T) versus/Ms(T) behavior showed that the nucleation was the dominating mechanism for the magnetization reversal in both sintered magnets,and the microstructural parameters of αk and Neff were obtained also.The Kronmüller-plot showed an increase of the αk responsible for an increase of the coercivity. |
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| Keywords: | sintered magnets Kronmüller-plot coercivity nucleation mechanism rare earths |
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