| 纳米块体金属钆和镝的磁性相变分析 |
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| 引用本文： | 刘凤艳,侯碧辉,岳明,王克军.纳米块体金属钆和镝的磁性相变分析[J].中国稀土学报,2011,29(1). |
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| 作者姓名： | 刘凤艳 侯碧辉 岳明 王克军 |
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| 作者单位： | 1. 北京工业大学应用数理学院,北京,100124
2. 北京工业大学材料科学与工程学院,北京,100124 |
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| 摘 要： | 对纳米晶钆(Gd)和镝(Dy)块体材料的磁性进行了研究.与多晶比较,通常纳米晶的磁化强度减小,居里温度TC降低,但平均粒径为10 nm的纳米晶Dy的居里温度TC反而升高到100 K,平均粒径为10 nm的纳米晶Gd中还存在明显的反铁磁相.通过RKKY交换作用的计算知道,晶面晶界处原子的交换积分会发生正负号的变化,能量最低的稳定状态对应三种有序相:铁磁相、反铁磁相和扇相,晶粒中在一定条件下出现三相共存.对于平均粒径为10 nm的纳米晶,晶面晶界处原子所占比例很大,三相叠加的结果,对于Gd,即是在相变点附近出现磁化强度尖峰;对于Dy,则是磁化强度随温度升高下降缓慢,表现为居里温度TC比多晶升高.
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| 关 键 词： | 纳米晶 重稀土金属 钆和镝 磁相变 扇相 |
Magnetic Phase Transition of Nanocrystalline Bulk Metal Gadolinium and Dysprosium |
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| Liu Fengyan,Hou Bihui,Yue Ming,Wang Kejun.Magnetic Phase Transition of Nanocrystalline Bulk Metal Gadolinium and Dysprosium[J].Journal of the Chinese Rare Earth Society,2011,29(1). |
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| Authors: | Liu Fengyan Hou Bihui Yue Ming Wang Kejun |
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| Institution: | Liu Fengyan1,Hou Bihui1,Yue Ming2,Wang Kejun2(1.College of Applied Science,Beijing University of Technology,Beijing 100124,China,2.College of Materials Science and Engineering,China) |
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| Abstract: | The magnetic properties of bulk nanocrystalline metal gadolinium(Gd) and dysprosium(Dy) samples were studied.The magnetization and Curie temperature TC of nanocrystalline Gd and Dy decreased usually as compared with the polycrystal.However,when the mean grain size was 10 nm,the Curie temperature TC of nanocrystalline Dy increased to 100 K instead and there was an antiferromagnetic phase in nanocrystalline Gd.According to the calculation based on Ruderman-Kittel-Kasuya-Yosida exchange interaction,the exchang... |
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| Keywords: | nanocrystal heavy rare earth metal Gd and Dy magnetic phase transition fan phase |
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