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, Yongchun1 ; Zhang, Ying1 ; Sun, Kai 2; Kang, Long 1
	2010-02-01
发表期刊	Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
ISSN	1002185X
卷号	39 期号:2 页码:281-287
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).
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
收录类别	EI
语种	中文
出版者	Rare Metals Materials and Engineering Press
EI入藏号	20101512842366
EI主题词	Nickel metallography
EI分类号	522 Gas Fuels ; 531.2 Metallography ; 543.1 Chromium and Alloys ; 544.2 Copper Alloys ; 546.2 Tin and Alloys ; 547.2 Rare Earth Metals ; 549.2 Alkaline Earth Metals ; 549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals ; 622.1 Radioactive Materials, General ; 801 Chemistry ; 804.2 Inorganic Compounds ; 931.3 Atomic and Molecular Physics ; 933.1.1 Crystal Lattice ; 951 Materials Science
文献类型	期刊论文
条目标识符	https://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
第一作者单位	兰州理工大学
第一作者的第一单位	兰州理工大学
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.