Oxygen-vacancy ordering in lanthanide-doped ceria: Dopant-type dependence and structure model

被引：140

作者：

Ou, Ding Rong ^{[1
]}

Mori, Toshiyuki ^{[1
]}

Ye, Fei ^{[1
]}

Zou, Jin ^{[2
,3
]}

Auchterlonie, Graeme ^{[3
]}

Drennan, John

机构：

[1] Natl Inst Mat Sci, Fuel Cell Mat Sci, Tsukuba, Ibaraki 3050044, Japan

[2] Univ Queensland, Sch Engn, St Lucia, Qld 4072, Australia

[3] Univ Queensland, Ctr Microscopy & Microanal, St Lucia, Qld 4072, Australia

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.77.024108

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Studies of electron energy loss spectroscopy and selected area electron diffraction (SAED) were systematically performed on 15 and 25 at. % lanthanide (Ln)-doped ceria samples (Ln=Sm, Gd, Dy, and Yb), through which the local ordering of oxygen vacancies that develops with increase in doping level was confirmed in the sequence of (Gd,Sm)>Dy>Yb. Furthermore, a monotone correlation between the development of the ordering and the degradation of ionic conductivity with increasing the doping concentration from 15 to 25 at. % was observed. Based on the analysis of SAED patterns, a structural model for the ordering of oxygen vacancies has been constructed, in which the arrangement of oxygen vacancies is similar to that in C-type Ln(2)O(3) oxides and the 1/2 < 110 > pairs of the vacancies are preferred. Then, the factors that can influence the formation of the ordering are discussed.

引用

页数：8

共 38 条

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