Crystal structure of hydrogen storage alloy La0.67Mg0.33 Ni2.5Co0.5 and its deuteride La0.67Mg0.33 Ni2.5Co0.5D4.0

	Crystal structure of hydrogen storage alloy La0.67Mg0.33 Ni2.5Co0.5 and its deuteride La0.67Mg0.33 Ni2.5Co0.5D4.0
	Luo, Yongchun 1; Zhang, Ying 1; Sun, Kai 2; Kang, Long 1
刊名	Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
	2010-02-01
卷号	39 期号:2 页码:281-287
关键词	Atoms Binary alloys Cerium alloys Chromium alloys Chromium metallography Cobalt alloys Cobalt metallography Copper alloys Copper metallography Crystal structure Deuterium compounds Expansion Hydrogen storage Lanthanum alloys Magnesium alloys Magnesium metallography Neutron diffraction Plutonium alloys Rietveld refinement Ternary alloys Tin alloys Tin metallography Anisotropic volume expansions Annealed alloys Deuterides Isotropic lattices PuNi3-type structure Rhombohedral structures Volumetric expansion X-Ray and neutron diffraction
ISSN号	1002185X
英文摘要	Crystal structure of annealed alloy La0.67Mg0.33Ni2.5Co0.5 and (La0.67Mg0.33Ni2.5Co0.5) 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)Ni3 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)Ni3 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) D4.0 has a rhombohedral structure. For the (La0.67Mg0.33 Ni2.5Co0.5) D4.0 deuteride, the significant occupancy of deuterium atoms are mainly six sites: 6c1, 18h3 and 18h1 within the RM2 units and 36i2, 18h5, 6c4 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 (La0.67Mg0.33 Ni2.5Co0.5) D4.0, the total isotropic lattice expansions of the a-axis and c-axis are δa/a=7.1% and δc/c=9.1%, respectively. A significant anisotropic volume expansion (δc/c=15.8%, δV/VRM2=32.8%) is found inside the RM2 unit, but inside the RM5unit, the volumetric expansions are 2.4% (δc/c) and 17.5% (δV/VRM5).
语种	中文
出版者	Rare Metals Materials and Engineering Press
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150283]
专题	材料科学与工程学院电气工程与信息工程学院
作者单位	1.State Key Lab. of Gansu Advanced Nonferrous Metal Material, Lanzhou University of Technology, Lanzhou 730050, China; 2.China Institute of Atomic Energy, Beijing 102413, China
推荐引用方式 GB/T 7714	Luo, Yongchun,Zhang, Ying,Sun, Kai,et al. Crystal structure of hydrogen storage alloy La0.67Mg0.33 Ni2.5Co0.5 and its deuteride La0.67Mg0.33 Ni2.5Co0.5D4.0[J]. Xiyou Jinshu Cailiao Yu Gongcheng/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 La0.67Mg0.33 Ni2.5Co0.5 and its deuteride La0.67Mg0.33 Ni2.5Co0.5D4.0.Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering,39(2),281-287.
MLA	Luo, Yongchun,et al."Crystal structure of hydrogen storage alloy La0.67Mg0.33 Ni2.5Co0.5 and its deuteride La0.67Mg0.33 Ni2.5Co0.5D4.0".Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering 39.2(2010):281-287.