Structural changes of Ce-Pr-O oxides in hydrogen:: a study by in situ X-ray diffraction and Raman spectroscopy

被引：81

作者：

Rossignol, S

Gérard, F

Mesnard, D

Kappenstein, C

Duprez, D

机构：

[1] CNRS, Lab Catalyse Chim Organ UMR6503, F-86022 Poitiers, France

[2] Univ Poitiers, F-86022 Poitiers, France

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2003年 / 13卷 / 12期

关键词：

D O I：

10.1039/b306726b

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：

Ce-Pr-O mixed oxides prepared by coprecipitation and calcined at 1173 K reveal a non stoichiometric structure with oxygen vacancies in the bulk. In situ XRD and Raman spectroscopy were used to investigate these properties simultaneously and identified a thermal expansion coefficient twice as high as that of pure ceria at room temperature and the presence of a Raman band at 560 cm(-1), characteristic of the oxygen vacancies. These results confirm that praseodymium atoms are able to induce oxygen mobility in the bulk at 298 K. This is due to a structure containing a high number of anionic vacancies pre-existing at ambient temperature.

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页码：3017 / 3020

页数：4

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