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	Crystal structure of the primitive orthorhombic epsilon '-(al,si)(4)cr phase
	He, ZB; Kuo, KH
刊名	Journal of alloys and compounds
	2005-05-31
卷号	395期号:1-2页码:117-125
关键词	Al-cr-si Crystalline approximant Crystal structure Icosahedron
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2004.11.055
通讯作者	Kuo, kh()
英文摘要	The crystal structure of the primitive orthorhombic ε-(al,si)(4)cr phase has been determined by single-crystal x-ray diffraction analysis: pbnm (no. 62), a = 3.4477(4) nm. b = 2.0098(6) nm, c = 1.2467(6) nm, v= 8.6386(2) nm(3), pearson symbol op576-5.6, z = 8, mr = 2302.68. experimental composition al72.1si7.6cr20.3. formula sum al50.94si5.45cr14.9, i.e., al71.45si7.64cr20.91 or (a1,si)(79.09)cr-20.91, very close to (al,si)(4)cr. dx = 3.541 g/cm(3), f(0 0 0) = 877 λ(mo kα) = 0.071073 nm, μ = 4.798 mm(-1), t = 293 ± 2 k. final r = 0.0632 for 9698 reflections with f-o > 4σ(f-o) and 0.0852 for all 13,087 reflections, goodness of fit s = 1.056. there are 94 (62 al + 8 si + 24 cr) independent atomic positions in the unit-cell, of which 6 al, 5 si and 21 cr atom sites have icosahedral coordination. interatomic distances cover the ranges of 0.2537-0.2840 nm, 0.2287-0.2978 nm and 0.2487-0.3060 nm for cr-cr, cr-al(si) and ai(si)-al(si) atomic pairs, respectively. the structure of ε'-(al,si)(4)cr is characterized by a layer structure consisting of pfp(pfp)' layers stacked along the c-axis, where f and p denote flat and puckered layers, respectively, and (pfp)' is related to pfp by a 21 rotation. the icosahedral clusters and their arrangements in the primitive ε' are identical to those in the parent structure of ε-al4cr (bbmm) and similar to a number of hexagonal and orthorhombic al∼ 4tm (transition metals) including the hexagonal μ-al4cr/μ-al4mn (p6(3)/mmc). © 2004 elsevier b.v. all rights reserved.
WOS关键词	AL-CR SYSTEM ; QUASI-CRYSTALS ; APPROXIMANT ; 0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1 ; EQUILIBRIA ; SYMMETRY ; AL-4(CR ; ALLOYS ; FAMILY
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000229410600024
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2373608
专题	物理研究所
通讯作者	Kuo, KH
作者单位	1.Dalian Univ Technol, Dept Mat Technol, Dalian 116024, Peoples R China 2.Chinese Acad Sci, Inst Phys, Beijing Lab Electron Microscopy, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	He, ZB,Kuo, KH. Crystal structure of the primitive orthorhombic epsilon '-(al,si)(4)cr phase[J]. Journal of alloys and compounds,2005,395(1-2):117-125.
APA	He, ZB,&Kuo, KH.(2005).Crystal structure of the primitive orthorhombic epsilon '-(al,si)(4)cr phase.Journal of alloys and compounds,395(1-2),117-125.
MLA	He, ZB,et al."Crystal structure of the primitive orthorhombic epsilon '-(al,si)(4)cr phase".Journal of alloys and compounds 395.1-2(2005):117-125.

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