Investigation of the influence of zirconium substitution on the properties of neodymium-doped barium cerates

被引：70

作者：

Wienstroer, S ^{[1
]}

Wiemhofer, HD ^{[1
]}

机构：

[1] Univ Munster, Inst Anorgan Chem, D-48149 Munster, Germany

来源：

SOLID STATE IONICS | 1997年 / 101卷

关键词：

barium cerate; barium zirconate; structure; x-ray diffraction; proton conductor; oxygen ion conductivity; microcontact;

D O I：

10.1016/S0167-2738(97)00163-X

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：

Preparation, electrical conductivity and stability are discussed for Nd-doped barium cerate with partial substitution of zirconium for cerium. BaCe0.9ZrxNd0.1O2.95 with 0.1 less than or equal to x less than or equal to 0.9 was prepared by direct reaction of mixtures of barium carbonate and the corresponding metal oxides. Structural properties of BaCe0.9-xZrxNd0.1O2.95 were investigated by X-ray diffraction and raman scattering. Single phases were obtained over the entire range of x-values, if reaction temperatures above 1500 degrees C were applied. The total conductivity was measured as a function of temperature and for different conditions of p(H2O), p(O-2) in N-2. Only a slight decrease in the total conductivity was found up to 60%-zirconium substitution. In addition, the oxygen ion conductivity was determined for 600 degrees C-800 degrees C using an ion conducting microelectrode made from stabilized zirconia. The oxygen ion conductivity was lower than the total conductivity by about two orders of magnitude. The observed total conductivity is therefore attributed primarily to proton conductivity.

引用

页码：1113 / 1117

页数：5

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