| Mg_3MNi_2(M=Ti,Al)的晶体结构 |
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| 引用本文： | 吕光烈,陈林深,胡秀荣,王连邦,袁华堂. Mg_3MNi_2(M=Ti,Al)的晶体结构[J]. 金属学报, 2001, 0(5) |
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| 作者姓名： | 吕光烈 陈林深 胡秀荣 王连邦 袁华堂 |
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| 作者单位： | 浙江大学中心实验室!杭州310028(吕光烈，陈林深，胡秀荣)，南开大学新能源材料化学所!天津300071(王连邦，袁华堂) |
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| 基金项目： | 国家自然科学基金59671016，59781001，浙江省分析测试基金资助项目 |
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| 摘 要： | Ａｌ和Ｔｉ对Ｍｇ２Ｎｉ结构中部分Ｍｇ的取代，得到与Ｍｇ２Ｎｉ晶体结构不同的新型合金．多晶Ｘ射线结构分析表明，其化学式为Ｍｇ３ＭＮｉ２（Ｍ＝Ｔｉ，Ａｌ），立方晶系，空间群Ｆｄ３ｍ， Ｚ＝１６，４８个Ｍｇ坐落在４８（ｆ），１６个 Ｍ（Ｍ＝Ａｌ， Ｔｉ）坐落在１６（ｄ）位，３２个Ｎｉ坐落在３２（ｅ）位，Ｍｇ３ＡｌＮｉ２的晶胞参数ａ＝１．１５４７４（２）ｎｍ， Ｍｇ３ＴｉＮｉ２的ａ＝１．１６１７８（２）ｎｍ．与Ｍｇ２Ｎｉ相比，Ｍｇ３ＭＮｉ２合金的晶体密度更大，Ｍｇ－Ｎｉ键长更长，吸放氢温度降低，循环寿命延长．
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| 关 键 词： | 贮氢合金 XRD结构分析 Mg2MNi2(M=Al Ti) |
THE CRTSTAL STRUCTURE OF NEW HYDROGEN STORAGE Mg_3MNi_2 (M=Al, Ti) ALLOYS |
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| LU Guanglie,CHEN Linshen,HU Xiurong Center Laboratory,Zhejiang University,Hangzhou WANG Lianbang,YUAN Huantang Institute of New Energy Material Chemistry,Nankai University,Tianjin. THE CRTSTAL STRUCTURE OF NEW HYDROGEN STORAGE Mg_3MNi_2 (M=Al, Ti) ALLOYS[J]. Acta Metallurgica Sinica, 2001, 0(5) |
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| Authors: | LU Guanglie CHEN Linshen HU Xiurong Center Laboratory Zhejiang University Hangzhou WANG Lianbang YUAN Huantang Institute of New Energy Material Chemistry Nankai University Tianjin |
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| Affiliation: | LU Guanglie,CHEN Linshen,HU Xiurong Center Laboratory,Zhejiang University,Hangzhou 310028 WANG Lianbang,YUAN Huantang Institute of New Energy Material Chemistry,Nankai University,Tianjin 300071 |
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| Abstract: | A new phase different to Mg2Ni was obtained when Mg component in Mg2Ni was partially replaced by Al or Ti. X-ray powder diffraction structure analysis showed that the new phase is of cubic system, S. G. Fd3m (No.227), the chemical formula Mg3MNi2 (M=Al, Ti). Z=16, sixteen molecules per unit cell, cell parameter a=1.15474(2) nm for Mg3AlNi2 and a=l.16178(2) nm for Mg3TiNi2, 48 atoms of Mg are located on 48(f) sites, 16 atoms of M (Ti, Al) on 16(d) and 32 atoms of Ni on 32(e). Compared with Mg2Ni, Mg3AlNi2 has bigger density and longer Mg-Ni bond length. Meanwhile, the hydriding / dehydriding temperature is lower and the electrochemical cycle life is longer. |
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| Keywords: | hydrogen storage alloys XRD structure analysis Mg2MNi2(M=Al Ti) |
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