Enhanced ionic conductivity in nanostructured, heavily doped ceria ceramics

被引：211

作者：

Bellino, MG ^{[1
]}

Lamas, DG ^{[1
]}

de Reca, NEW ^{[1
]}

机构：

[1] Consejo Nacl Invest Cient & Tecn, CITEFA, CINSO, Ctr Invest Solidos, RA-1603 Pcia, BA, Argentina

来源：

ADVANCED FUNCTIONAL MATERIALS | 2006年 / 16卷 / 01期

关键词：

D O I：

10.1002/adfm.200500186

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The electrical properties of nanostructured, heavily yttria- or samaria-doped ceria ceramics are studied as a function of grain size using electrochemical impedance spectroscopy (EIS). A remarkable enhancement in the total ionic conductivity of about one order of magnitude is found in nanostructured samples, compared with the intrinsic bulk conductivity of conventional microcrystalline ceramics. This effect is attributed to the predominance of grain-boundary conduction in the nanostructured materials, coupled with an increase in the grain-boundary ionic diffusivity with decreasing grain size.

引用

页码：107 / 113

页数：7

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