| Crystal structure and hard magnetic properties of TbCu_7-type Sm_(0.98)Fe_(9.02–x)Ga_x nitrides |
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| 引用本文： | 权宁涛,张世荣,于敦波,李扩社,罗阳,靳金玲,张坤,刘宇超,李红卫.Crystal structure and hard magnetic properties of TbCu_7-type Sm_(0.98)Fe_(9.02–x)Ga_x nitrides[J].中国稀土学报(英文版),2014,32(8):722-726. |
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| 作者姓名： | 权宁涛 张世荣 于敦波 李扩社 罗阳 靳金玲 张坤 刘宇超 李红卫 |
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| 基金项目： | Project supported by International Science and Technology Cooperation Project （2010 DFB53520） and the National High Technology Research and Development Program of China （2011AA03A402） |
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| 摘 要： | The compound Sm0.98Fe9.02–xGaxNδ(x=0, 0.25, 0.5, 0.75, 1) were prepared by melt-spun method and subsequent annealing and nitriding. The Rietveld analysis showed that the lattice expansion played an important role in improving the Curie temperature. An obvious development of the Curie temperature was obtained with the increased Ga content from x=0–1(ΔTc=90 oC). The optimum coercivity of nitrides was obtained at x=0.25 with the value Hcj=652 kA/m(8.15 kOe) after annealing, which corresponded to a reasonable distribution of grain sizes of both TbCu7-type SmFe9Nδ and α-Fe. However, an excess of Ga doping might lead to an abnormal growth of α-Fe, which in turn deteriorated the magnetic properties. It was concluded that a moderate Ga content was very effective in raising the coercivity and Curie temperament in the TbCu7-type Sm-Fe-N.
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| 关 键 词： | 磁特性 氮化物 晶体结构 Rietveld分析 Sm-Fe-N 高居里温度 高矫顽力 熔融纺丝法 |
| 收稿时间： | 14 February 2014 |
Crystal structure and hard magnetic properties of TbCu7-type Sm0.98Fe9.02-xGax nitrides |
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| QUAN Ningtao,ZHANG Shirong,YU Dunbo,LI Kuoshe,LUO Yang,JIN Jinling,ZHANG Kun,LIU Yuchao,LI Hongwei.Crystal structure and hard magnetic properties of TbCu7-type Sm0.98Fe9.02-xGax nitrides[J].Journal of Rare Earths,2014,32(8):722-726. |
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| Authors: | QUAN Ningtao ZHANG Shirong YU Dunbo LI Kuoshe LUO Yang JIN Jinling ZHANG Kun LIU Yuchao LI Hongwei |
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| Affiliation: | National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, Grirem Advanced Materials Co., Ltd., Beijing 100088, China |
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| Abstract: | The compound Sm0.98Fe9.02–xGaxNδ (x=0, 0.25, 0.5, 0.75, 1) were prepared by melt-spun method and subsequent annealing and nitriding. The Rietveld analysis showed that the lattice expansion played an important role in improving the Curie temperature. An obvious development of the Curie temperature was obtained with the increased Ga content from x=0–1 (ΔTc=90 °C). The optimum coercivity of nitrides was obtained at x=0.25 with the value Hcj=652 kA/m (8.15 kOe) after annealing, which corresponded to a reasonable distribution of grain sizes of both TbCu7-type SmFe9NΔ and α-Fe. However, an excess of Ga doping might lead to an abnormal growth of α-Fe, which in turn deteriorated the magnetic properties. It was concluded that a moderate Ga content was very effective in raising the coercivity and Curie temperament in the TbCu7-type Sm-Fe-N. |
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| Keywords: | rapid-quenching SmFeGa alloy TbCu7-type structure rare earths |
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