NEUTRON DIFFRACTION STUDY OF DEUTERIUM OCCUPANCY OF DEUTERIDE OF LAVES PHASE ALLOY Ti0.68Zr0.32MnCrD3.0

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	NEUTRON DIFFRACTION STUDY OF DEUTERIUM OCCUPANCY OF DEUTERIDE OF LAVES PHASE ALLOY Ti0.68Zr0.32MnCrD3.0
	Wu Erdong 1; Guo Xiumei 1; Sun Kai 2
刊名	ACTA METALLURGICA SINICA
	2009-05-01
卷号	45 期号:5 页码:513-518
关键词	deuteride of Laves phase alloy neutron diffraction D occupancy short range ordering structure diffuse scattering
ISSN号	0412-1961
通讯作者	Wu Erdong(ewu@imr.ac.cn)
英文摘要	The occurrences of diffuse scattering in the neutron diffraction patterns of the deuterides of Laves phase have frequently been reported, but have not been specifically studied. As the diffuse scattering indicates the formation of short range ordering of D and/or alloy atoms in the phase, we have particularly studied the possible short range ordering of interstitial D atoms in the deuteride of a null matrix Laves phase alloy Ti0.68Zr0.32MnCr by neutron and XRD techniques. The neutron diffraction pattern of the deuteride Ti0.68Zr0.32MnCrD3.0 has shown not only the Bragg peaks, but also strong diffuse scattering, whereas the corresponding XRD pattern has only shown the Bragg peaks. These phenomena confirm the formation of short range ordering of interstitial D in the deuteride. The D occupancy and short range ordering of the deuteride were analyzed by the Rietveld refinement and Fourier transformation. The analyses suggest that a fraction of D atoms in the deuteride is randomly and unsaturatedly distributed in certain interstices, and forms a long range ordered structure in the crystal lattice. These interstitial atoms are in four types of the A(2)B(2) tetrahedral sites, where the occupancies of the D atoms in the 6h(1) and 12k crystallographic sites are higher than those in the 6h(2) and 24l sites. However, other D atoms in the deuteride have stayed away from the centres of the interstitial sites to different extents, and formed the short ran-e ordered structure. These D atoms keep an average interdistance of 0.243 nm for the nearest neighbours, larger than that of about 0.2 nm for the long range ordered D atoms. The short and long range ordered D atoms together form a cluster network surround the Ti/Zr atoms along the c-axis of the lattice. The phenomenon is likely to be caused by the accumulation of great amount of D atoms in the interstices of the alloy.
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000266627900001
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/98539]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wu Erdong
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.China Inst Atom Energy, Beijing 102413, Peoples R China
推荐引用方式 GB/T 7714	Wu Erdong,Guo Xiumei,Sun Kai. NEUTRON DIFFRACTION STUDY OF DEUTERIUM OCCUPANCY OF DEUTERIDE OF LAVES PHASE ALLOY Ti0.68Zr0.32MnCrD3.0[J]. ACTA METALLURGICA SINICA,2009,45(5):513-518.
APA	Wu Erdong,Guo Xiumei,&Sun Kai.(2009).NEUTRON DIFFRACTION STUDY OF DEUTERIUM OCCUPANCY OF DEUTERIDE OF LAVES PHASE ALLOY Ti0.68Zr0.32MnCrD3.0.ACTA METALLURGICA SINICA,45(5),513-518.
MLA	Wu Erdong,et al."NEUTRON DIFFRACTION STUDY OF DEUTERIUM OCCUPANCY OF DEUTERIDE OF LAVES PHASE ALLOY Ti0.68Zr0.32MnCrD3.0".ACTA METALLURGICA SINICA 45.5(2009):513-518.