| Dumb-bell Structures of Nonstoichiometric La（Ni, Sn）5＋x Alloys and Their Relationships with the Preparation Methods |
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| 引用本文： | YUAN Zhi-Qing a Lü Guang-Lie a② WEI Fan-Song b LEI Yong-Quan b a (Central Laboratory,Zhejiang University,Zhejiang 310028,China) b (Department of Materials Science and Engineering,Zhejiang 310027,China). Dumb-bell Structures of Nonstoichiometric La（Ni, Sn）5＋x Alloys and Their Relationships with the Preparation Methods[J]. 结构化学, 2004, 23(5): 520-524 |
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| 作者姓名： | YUAN Zhi-Qing a Lü Guang-Lie a② WEI Fan-Song b LEI Yong-Quan b a (Central Laboratory Zhejiang University Zhejiang 310028 China) b (Department of Materials Science and Engineering Zhejiang 310027 China) |
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| 作者单位： | YUAN Zhi-Qing a Lü Guang-Lie a② WEI Fan-Song b LEI Yong-Quan b a (Central Laboratory，Zhejiang University，Zhejiang 310028，China) b (Department of Materials Science and Engineering，Zhejiang 310027，China) |
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| 基金项目： | This work was supported by the National Natural Science Foundation of China (50071052) and National Natural Science Key Foundation of China (50131040) |
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| 摘 要： | Crystal structures of nonstoichiometric La(Ni, Sn)5 x (x = 0.1～0.4) alloysprepared by different methods were investigated by using powder X-ray diffraction and Rietveldrefinement analysis. Space group of this type of alloys belongs to P6/mmm, in which Sn onlyoccupies the 3g sites. It has been demonstrated that some of the la sites of the nonstoichiometricalloy are replaced by the Ni-Ni dumb-bells which have a strong correlation with the anisotropicthermal parameter B33. The preparation methods have an effect on the number of dumb-bells thatcan substitute the l a sites. It was found that the annealed alloys have more Ni-Ni dumb-bells inthe structure than the rapid solidified and as-cast alloys have while still keep good crystallinity.
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| 关 键 词： | 非化学计量 La（Ni,Sn）5＋X 合金 晶体表面结构 |
Dumb-bell Structures of Nonstoichiometric La(Ni,Sn)5+x Alloys and Their Relationships with the Preparation Methods |
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| YUAN Zhi-qing,Lü Guang-Lie,WEI Fan-Song,LEI Yong-quan. Dumb-bell Structures of Nonstoichiometric La(Ni,Sn)5+x Alloys and Their Relationships with the Preparation Methods[J]. Chinese Journal of Structural Chemistry, 2004, 23(5): 520-524 |
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| Authors: | YUAN Zhi-qing Lü Guang-Lie WEI Fan-Song LEI Yong-quan |
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| Affiliation: | 1. Central Laboratory, Zhejiang University, Zhejiang 310028, China
2. Department of Materials Science and Engineering, Zhejiang 310027, China |
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| Abstract: | Crystal structures of nonstoichiometric La(Ni, Sn)5+x (x = 0.1～0.4) alloys prepared by different methods were investigated by using powder X-ray diffraction and Rietveld refinement analysis. Space group of this type of alloys belongs to P6/mmm, in which Sn only occupies the 3g sites. It has been demonstrated that some of the 1a sites of the nonstoichiometric alloy are replaced by the Ni-Ni dumb-bells which have a strong correlation with the anisotropic thermal parameter B33. The preparation methods have an effect on the number of dumb-bells that can substitute the 1a sites. It was found that the annealed alloys have more Ni-Ni dumb-bells in the structure than the rapid solidified and as-cast alloys have while still keep good crystallinity. |
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| Keywords: | nonstoichiometric alloy rapid solidified alloy crystallographic structure Rietveld refinement |
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