Effect of Terbium addition on the coercivity of the sintered NdFeB magnets
来源期刊：Journal of Rare Earths2010年第S1期
论文作者：泮敏翔 张朋越 李贤君 葛洪良 吴琼 焦志伟
文章页码：399 - 402
摘 要：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.
泮敏翔1，张朋越1，李贤君2，葛洪良1，吴琼1，焦志伟1
1. Department of Materials Science and Engineering,China Jiliang University2. Beijing Research Institute of Mechanical & Electrical Technology
摘 要：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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