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Effect of water/water vapor on microstructure and phase stability of (Y0.25Bi0.75)2O3 solid electrolytes

Published online by Cambridge University Press:  31 January 2011

Chaur-Chi Huang  and
Kuan-Zong Fung
Chaur-Chi Huang
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan 70101, Taiwan, Republic of China
Kuan-Zong Fung*
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan 70101, Taiwan, Republic of China
*
a)Address all correspondence to this author. e-mail: kzfung@mail.ncku.edu.tw
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Abstract

Highly conductive cubic (Y0.25Bi0.75)2O3 tends to transform to rhombohedral (Y0.25Bi0.75)2O3 when annealed at 600°C for more than 200 h. Although the rhombohedral phase of (Y0.25Bi0.75)2O3 was known to be the stable phase at temperatures ≤600°C, it was found that the annealed (Y0.25Bi0.75)2O3 was not thermodynamically stable in the water-containing environment. From x-ray diffraction and transmission electron microscopy analysis, it was observed that the annealed (Y0.25Bi0.75)2O3 easily decomposed into monoclinic α-Bi2O3 and yttrium hydroxide at a temperature as low as 50°C. The monoclinic α-Bi2O3 further reacted with CO2 and formed Bi2O2CO3. Consequently, the annealed (Y0.25Bi0.75)2O3 degraded and became flaky powder. Scanning electron microscopy micrographs of water-reacted (Y0.25Bi0.75)2O3 also showed surface swelling and peeling. Such surface deterioration was caused by a large volume increase during the water reaction. Similar reaction was also observed when the annealed (Y0.25Bi0.75)2O3 was exposed in the humidified air at 300°C. As the temperature was raised to 500°C, little reaction was observed between water vapor and (Y0.25Bi0.75)2O3. The better stability of (Y0.25Bi0.75)2O3 at elevated temperature was observed.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 11 , November 2003 , pp. 2624 - 2632
Copyright
Copyright © Materials Research Society 2003

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