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题名: Surface segregation behaviors of amorphous Ni65Nb35 alloy under oxidation in O-2 at various temperatures
作者: Song, Z;  Tan, DL;  He, F;  Bao, XH
关键词: catalysis ;  amorphous ;  Ni-Nb alloy ;  oxidation ;  segregation
刊名: APPLIED SURFACE SCIENCE
发表日期: 1999
卷: 137, 期:1-4, 页:142-149
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Materials Science, Coatings & Films ;  Physics, Applied ;  Physics, Condensed Matter
研究领域[WOS]: Chemistry ;  Materials Science ;  Physics
英文摘要: Variations of surface morphology and chemical composition of amorphous Ni65Nb35 alloy after oxidation in 1 atm O-2 at temperatures from room temperature to 773 K have been investigated using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (LES) depth profile methods. Inverse segregation behaviors have been observed at two oxidation temperature ranges. At the lower temperature range (less than or equal to 373 K), Nb segregates at the surface as Nb2O5; while at the higher temperature range (greater than or equal to 523 K), Ni segregates at the surface as metallic Ni and NiO. Different oxidation mechanisms have been suggested to operate in the two oxidation temperature ranges, which may be concerned with different oxidation rates of Nb and diffusion speeds of O and Ni ions in the Nb,O, layer at different temperatures. The affinities of Ni and Nb to oxygen may act as the driving force of the segregation. (C) 1999 Elsevier Science B.V. All rights reserved.
关键词[WOS]: CARBON-MONOXIDE ;  NIOBIC ACID ;  ZR ALLOYS ;  CATALYSTS ;  HYDROGENATION
语种: 英语
WOS记录号: WOS:000077925100019
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138591
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Tianjin Univ, State Key Lab C1 Chem Engn, Tianjin 300072, Peoples R China

Recommended Citation:
Song, Z,Tan, DL,He, F,et al. Surface segregation behaviors of amorphous Ni65Nb35 alloy under oxidation in O-2 at various temperatures[J]. APPLIED SURFACE SCIENCE,1999,137(1-4):142-149.
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