1. Enhanced electrical conductivity of LaNbO4 by A-site substitution.
- Author
-
Cao, Yong, Duan, Nanqi, Yan, Dong, Chi, Bo, Pu, Jian, and Jian, Li
- Subjects
- *
ELECTRIC conductivity , *LANTHANUM compounds , *SOLID oxide fuel cells , *SUBSTITUTION reactions , *IONIC conductivity - Abstract
In LaNbO 4 , Sm, Gd and Yb were investigated as substitutes to enhance its ion conductivity, for its application in solid oxide fuel cell. La 0.9 M 0.1 NbO 4 (M = Sm, Gd, Yb) was prepared via a solid–state reaction route and single phase was attained by calcining the constituent oxides at 1200 °C for 5 h. The total conductivity of LaNbO 4 was increased by partly replaced La with Sm, Gd and Yb, due to the muti-valences of the substitutions. The highest conductivity (1.76 × 10 −4 S cm −1 ) was achieved for La 0.9 Sm 0.1 NbO 4 at 800 °C in wet air, more than one order higher compared to that of LaNbO 4 . The introduction of Sm, Gd or Yb also slightly increased the ion transport number of LaNbO 4 , indicating that the increase of the total conductivity was mainly contributed by the enhanced ion conductivity, which was beneficial for its application as a pure ion conductor. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF