Characterization of adsorbed water layers on Y2O3-doped ZrO2

被引：167

作者：

Raz, S

Sasaki, K

Maier, J

Riess, I ^{[1
]}

机构：

[1] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel

[2] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

来源：

SOLID STATE IONICS | 2001年 / 143卷 / 02期

关键词：

YSZ; water coverage; proton mobility; conductivity (protonic); thermogravimetry;

D O I：

10.1016/S0167-2738(01)00826-8

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：

Chemisorption and physisorption of water from a humid atmosphere, on the oxide Y2O3-doped ZrO2 (YSZ), were investigated by conductivity measurements and thermogravimetry (TG), in the temperature range 35-700 degreesC. Ionic conduction is indicated to take place in a thin layer of water adsorbed on the oxide. That ionic conduction is most probably proton conduction. At T < 600 degreesC, it can exceed the oxygen ion conduction within the YSZ bulk when the oxide is made of fine powder. The electrical conductivity measurements of YSZ fine powder in humid atmosphere are analyzed in terms of water coverage, defect formation and proton mobility in the water layers. Further analysis of the water coverage is done using TG measurements. The enthalpies of defect formation and migration are determined. Results of preliminary conduction measurements of Al2O3 fine powder in a humid atmosphere reveal considerable similarities to those of YSZ. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：181 / 204

页数：24

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