Crystal Structure of Hydrogen Storage Alloy La0.67Mg0.33Ni2.5Co0.5 and Its Deuteride La0.67Mg0.33Ni2.5Co0.5D4.0

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	Crystal Structure of Hydrogen Storage Alloy La0.67Mg0.33Ni2.5Co0.5 and Its Deuteride La0.67Mg0.33Ni2.5Co0.5D4.0
	Luo Yongchun 1; Zhang Ying 1; Sun Kai 2; Kang Long 1
刊名	RARE METAL MATERIALS AND ENGINEERING
	2010-02
卷号	39 期号:2 页码:281-287
关键词	hydrogen storage alloy La0.67Mg0.33Ni2.5Co0.5 deuterides X-ray and neutron diffraction crystal structure
ISSN号	1002-185X
英文摘要	Crystal structure of annealed alloy La0.67Mg0.33Ni2.5Co0.5 and (La0.67Mg0.33Ni2.5Co0.5)D-4.0 deuterides were studied by X-ray diffraction, neutron diffraction and Rietveld refinement. It is found that the alloys are mainly composed of (La,Mg)Ni-3 phase with rhombohedra PuNi3 type (space group: R3m) structure, and the second phases are LaMgNi4 phase (MgCu4Sn type) and La2Ni7 phase (Ce2Ni7 type). In the (La,Mg)Ni-3 phase, the Mg atoms only occupy at 6c sites in the RM2 unit, while the Co atoms mainly occupy at 18 h in the RM5 unit and 6c positions in the boundary between the RM5 and RM2 blocks. The full deuteride of the main phase (La0.67Mg0.33Ni2.5Co0.5)D-4.0 has a rhombohedral structure. For the (La0.67Mg0.33Ni2.5Co0.5)D-4.0 deuteride, the significant occupancy of deuterium atoms are mainly six sites: 6c(1), 18h(3) and 18h(1) within the RM2 units and 36i(2), 18h(5), 6c(4) within the RM5 units. At the same time, it is found that the 6.5(1)D/f.u. is located within the RM5 units whereas the 3.2(2) )D/f.u. belongs to the RM2 units. For the PuNi3 type structure of (La0.67Mg0.33Ni2.5Co0.5)D-4.0, the total isotropic lattice expansions of the a-axis and c-axis are delta(a)/a=7.1% and delta(c)/c=9.1%, respectively. A significant anisotropic volume expansion (delta(c)/c=15.8%, delta(V)/V-RM2=32.8%) is found inside the RM2 unit, but inside the RM5 unit, the volumetric expansions are 2.4% (delta(c)/c) and 17.5% (delta(V)/V-RM5).
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	中文
出版者	NORTHWEST INST NONFERROUS METAL RESEARCH
WOS记录号	WOS:000275509900020
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/35289]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院电气工程与信息工程学院
通讯作者	Luo Yongchun
作者单位	1.Lanzhou Univ Technol, State Key Lab Gansu Adv Nonferrous Met Mat, Lanzhou 730050, Peoples R China 2.China Inst Atom Energy, Beijing 102413, Peoples R China
推荐引用方式 GB/T 7714	Luo Yongchun,Zhang Ying,Sun Kai,et al. Crystal Structure of Hydrogen Storage Alloy La0.67Mg0.33Ni2.5Co0.5 and Its Deuteride La0.67Mg0.33Ni2.5Co0.5D4.0[J]. RARE METAL MATERIALS AND ENGINEERING,2010,39(2):281-287.
APA	Luo Yongchun,Zhang Ying,Sun Kai,&Kang Long.(2010).Crystal Structure of Hydrogen Storage Alloy La0.67Mg0.33Ni2.5Co0.5 and Its Deuteride La0.67Mg0.33Ni2.5Co0.5D4.0.RARE METAL MATERIALS AND ENGINEERING,39(2),281-287.
MLA	Luo Yongchun,et al."Crystal Structure of Hydrogen Storage Alloy La0.67Mg0.33Ni2.5Co0.5 and Its Deuteride La0.67Mg0.33Ni2.5Co0.5D4.0".RARE METAL MATERIALS AND ENGINEERING 39.2(2010):281-287.