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Dependence of Dopant Cations on Microstructure and Proton Conductivity of Barium Zirconate

被引：74
作者：
Imashuku, S. [1 ]
Uda, T. [1 ]
Nose, Y. [1 ]
Taniguchi, G. [1 ]
Ito, Y. [1 ]
Awakura, Y. [1 ]
机构：
[1] Kyoto Univ, Dept Mat Sci & Engn, Sakyo Ku, Kyoto 6068501, Japan
来源：
JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2009年 / 156卷 / 01期
关键词：
barium compounds; crystal microstructure; doping; ionic conductivity; solubility; GRAIN-BOUNDARY CONDUCTIVITY; ELECTRICAL-CONDUCTIVITY; TRANSPORT-PROPERTIES; SINTERED OXIDES; YB; 1600-DEGREES-C; SOLUBILITY; HO;
D O I：
10.1149/1.2999335
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The effects of various cations (Mg2+, In3+, Yb3+, Tm3+, Er3+, Ho3+, Gd3+, Nd3+, La3+, Bi3+, and Ga3+) were examined as dopants into the B site of perovskite barium zirconate. The solubility of In, Yb, Tm, Er, and Ho, whose ionic radii are close to that of zirconium ion, into the B site is more than 0.075 (X-MO1.5=0.075) at 1600 degrees C. In contrast, when there is a large difference of ionic radii between trivalent cations (Nd3+, La3+, Bi3+, and Ga3+) and zirconium ion, the solubility of trivalent cations into barium zirconate is less than X-MO1.5=0.075. The microstructure of sintered pellets and their conductivity in wet atmosphere were investigated. We could divide dopants into two classes based on the extent of proton conductivity and microstructure: "Y-type" and "Sc-type" dopants. Yb, Ho, Er, and Tm belong to Y-type dopants, which have a microstructural mixture of coarse and fine grains and higher proton conductivity. In belongs to Sc-type dopants, which have well-grown grains and lower proton conductivity.
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页码：B1 / B8
页数：8
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