AN XPS STUDY OF THE MIXING EFFECTS INDUCED BY ION-BOMBARDMENT IN COMPOSITE OXIDES

被引：46

作者：

LEINEN, D ^{[1
]}

FERNANDEZ, A ^{[1
]}

ESPINOS, JP ^{[1
]}

HOLGADO, JP ^{[1
]}

GONZALEZELIPE, AR ^{[1
]}

机构：

[1] DEPT QUIM INORGAN,SEVILLE,SPAIN

来源：

APPLIED SURFACE SCIENCE | 1993年 / 68卷 / 04期

关键词：

D O I：

10.1016/0169-4332(93)90226-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

XPS has been used to study MxOy-TiO2 (MxOy: CeO2 and Al2O3) composite systems in powder form submitted to bombardment with ions (Ar+ and O2+) of 3.5 keV kinetic energy. In CeO2-TiO2 submitted to Ar+ bombardment it is found that cerium is reduced to Ce3+. This species remains stable against re-oxidation by exposure to O2, which contrasts with the behaviour of Ce3+ in partially reduced CeO2 where under similar conditions cerium is oxidized to Ce4+. Reduction to Ce3+ is also observed after O2+ bombardment which points to the fact that the cerium ions are mixed within the titanium oxide lattice and this is the reason for the stabilization of the Ce3+ state. In TiO2-Al2O3 the existence of mixing of the two components upon ion bombardment is shown by an accurate assessment of the photoelectron and Auger peaks of the spectra and the evaluation of the Auger parameters of the different elements. The use of XPS as a tool to show the existence of mixing in composite oxides after ion bombardment is discussed.

引用

页码：453 / 459

页数：7

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