Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 467, Issue 1-2, Pages 376-382Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2007.12.103
Keywords
Proton conductor; Perovskites; Sintering; Chemical stability; Electrical conductivity
Categories
Funding
- NNSF [50772030, 50572024]
- Foundation of Education Ministry for returning overseas scholar
- Hebei Polytechnic University
Ask authors/readers for more resources
The perovskite proton conductors BaCe0.45Zr0.45M0.1O3-delta (M = In, Y, Gd, Sm) containing equal molar proportions of both Ce and Zr were successfully synthesized by the conventional solid-state reaction route. The effect of sintering temperatures on phase purity, microstructure and electrical conductivity of these materials, were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and ac electrochemical impedance spectroscopy (EIS), respectively. In addition, chemical stability of the materials against CO2 at elevated temperatures and in boiling water was also investigated. The results indicate that 1600 degrees C is the optimum sintering temperature for maximizing conductivity. At 800 degrees C, the total conductivities of BaCe0.45Zr0.45M0.1O3-delta (M = In, Y, Gd, Sm) ceramics in air are 0.5 x 10(-2), 1.06 x 10(-2), 0.82 x 10(-2) and 0.69 x 10(-2) S cm(-1), respectively. The activation energies are 79.8, 73.0, 71.6 and 66.5 kJ mol(-1), respectively. While the conductivity of the mixed perovskite proton conductor decreases with increasing ionic radius from Y to Gd and Sm, there is an anomalous behaviour with respect to the smaller In dopant ion, giving rise to lowest conductivity in the above system. The ceramics are relatively stable in CO2; however, a small amount of amorphous phases can form in boiling water. (C) 2008 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available