Oxygen nonstoichiometry of nanosized ceria powder

被引：70

作者：

Kim, S ^{[1
]}

Merkle, R ^{[1
]}

Maier, J ^{[1
]}

机构：

[1] Max Planck Inst Festkorperforsch, Dept Chem, D-70569 Stuttgart, Germany

来源：

SURFACE SCIENCE | 2004年 / 549卷 / 03期

关键词：

polycrystalline surfaces; surface defects; oxygen; cerium;

D O I：

10.1016/j.susc.2003.12.002

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：

Oxygen nonstoichiometry of nanocrystalline ceria powder with a particle size of about 12 nm was measured by thermogravimetric techniques as a function of temperature, oxygen partial pressure and synthetic route. The measured oxygen release/uptake from the samples under isothermal or isobaric conditions applied in this study are found to be predominantly due to variations in the surface nonstoichiometry. Its oxygen partial pressure dependence indicates the presence of surface oxygen vacancies in different ionization states in addition to segregated impurities. (C) 2003 Published by Elsevier B.V.

引用

页码：196 / 202

页数：7

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