Rare Earth doped ceria: a combined X-ray and neutron pair distribution function study

被引：25

作者：

Coduri, Mauro ^{[2
]}

Brunelli, Michela ^{[1
]}

Scavini, Marco ^{[2
]}

Allieta, Mattia ^{[2
]}

Masala, Paolo ^{[2
]}

Capogna, Lucia ^{[1
,3
]}

Fischer, Henry E. ^{[1
]}

Ferrero, Claudio ^{[4
]}

机构：

[1] Inst Laue Langevin, F-38042 Grenoble 9, France

[2] Univ Milan, Dipartimento Chim Fis Elettrochim, I-20133 Milan, Italy

[3] OGG IOM CNR Grenoble, F-38042 Grenoble 9, France

[4] European Synchrotron Radiat Facil, F-38043 Grenoble 9, France

来源：

ZEITSCHRIFT FUR KRISTALLOGRAPHIE-CRYSTALLINE MATERIALS | 2012年 / 227卷 / 05期

关键词：

Doped ceria; Pair distribution function analysis; Solid oxide fuel cells; ELECTROLYTIC PROPERTIES; DOPANT CONCENTRATION; IONIC-CONDUCTIVITY; DIFFRACTION; REFINEMENT; TEMPERATURE; SIMULATION; VACANCY; EXAFS; XAFS;

D O I：

10.1524/zkri.2012.1493

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Rare Earth doped ceria materials (Ce1-xRExO2-x/2) are widely studied for their application in solid oxide fuel cell devices. In this work, RE(Yb, Y, Nd, La)-doped ceria samples at constant (x = 0.25) doping rate were subjected to a combined synchrotron radiation and neutron powder diffraction study. The dopants were chosen in order to cover a wide range of dopant-ionic radii. The effect of doping on the average structure is investigated using conventional Rietveld analysis, while the Pair Distribution Function technique is used to explore the spatial extent of disorder as well as the local structure. Two models for mapping the local structure, in terms of oxygen relaxation and nano-phase separation, are presented.

引用

页码：272 / 279

页数：8

共 54 条

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