Electrical conductivity in the system ZrO2-Y2O3-Sc2O3

被引：38

作者：

Yamamura, H

Utsunomiya, N

Mori, T

Atake, T

机构：

[1] Kanagawa Univ, Fac Engn, Dept Appl Chem, Kanagawa Ku, Yokohama, Kanagawa 221, Japan

[2] Natl Inst Res Inorgan Mat, Tsukuba, Ibaraki 305, Japan

[3] Tokyo Inst Technol, Engn Mat Res Lab, Midori Ku, Yokohama, Kanagawa 226, Japan

来源：

SOLID STATE IONICS | 1998年 / 107卷 / 3-4期

关键词：

electrical conductivity; oxygen vacancy; grain boundary phase; complex impedance spectroscopy; zirconia;

D O I：

10.1016/S0167-2738(97)00534-1

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：

In order to clarify the reason why the electrical conductivity of zirconia solid solution decreases abruptly, when it was highly doped with aliovalent oxide, the system (Y1-xScx)(0.3)Zr0.7O1.85 was studied by means of DC- and AC-conductivity measurements. Y0.3Zr0.7O1.85 (x = 0.0) showed lower conductivity than that of Y0.2Zr0.8O1.90. It was found that the decrease in the electrical conductivity was due to the presence of a grain boundary phase as a 'microdomain' by the complex impedance measurements. On the other hand, the substitution of Sc3+ for Y3+ increased the electrical conductivity, and at the same time, the grain boundary phase disappeared. This fact suggested that the high level doping induced a second phase at the grain boundary, resulting in the decrease in the electrical conductivity. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：185 / 189

页数：5

共 11 条

[1] The electrical conductivity of the ZrO2-Sc2O3-Y2O3 and ZrO2-Sc2O3-Yb2O3 systems [J].