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题名: Oxidation of Ir(111): From O-Ir-O trilayer to bulk oxide formation
作者: He, Y. B.1, 2;  Stierle, A.1;  Li, W. X.3;  Farkas, A.2;  Kasper, N.1;  Over, H.2
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2008-08-07
DOI: 10.1021/jp803607y
卷: 112, 期:31, 页:11946-11953
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: The oxidation of the Ir(111) surface was studied by in situ surface X-ray diffraction (SXRD) in an oxygen pressure range of 10(-6)-100 mbar at temperatures from 575 to 875 K, in combination with density functional theory calculations. Depending on the partial pressure and temperature, the formation of a series of oxide phases is observed. At a sample. temperature of 575 K, a single O-Ir-O trilayer forms at oxygen pressures of 10(-3) to 1 mbar, which grows into a hexagonal multilayer surface oxide at pressure of 100 mbar. Both surface oxides are only kinetically stabilized structures according to DFT calculations. The multilayer surface oxide is kinetically very stable against decomposition in vacuum and further oxidation at low temperature of 575 K as revealed by SXRD. At higher sample temperatures (775 and 875 K), O-Ir-O trilayers form at pressures around 1 mbar, whereas at a pressure of 100 mbar, bulklike rutile IrO(2) grows with predominant orientations of (110) and (100) along the normal of Ir(111).
关键词[WOS]: ENERGY ELECTRON-DIFFRACTION ;  IRIDIUM 111 SURFACE ;  X-RAY-DIFFRACTION ;  ATOMIC-SCALE ;  OXYGEN ;  CHEMISORPTION ;  O-2 ;  TRANSITION ;  ADSORPTION ;  REDUCTION
语种: 英语
WOS记录号: WOS:000258147200049
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141203
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.Max Planck Inst Met Res, D-70569 Stuttgart, Germany
2.Univ Giessen, Dept Phys Chem, D-35392 Giessen, Germany
3.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
He, Y. B.,Stierle, A.,Li, W. X.,et al. Oxidation of Ir(111): From O-Ir-O trilayer to bulk oxide formation[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2008,112(31):11946-11953.
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