Hostname: page-component-745bb68f8f-kw2vx Total loading time: 0 Render date: 2025-01-09T20:03:25.298Z Has data issue: false hasContentIssue false
  • English
  • Français

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: [email protected]
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1.Harwig, H.A. and Gerards, A.G., Thermochimica Acta 28, 121 (1979).CrossRefGoogle Scholar
2.Sillen, L.G., Ark. Kemi Mineral. Geol. 12A, 1 (1937).Google Scholar
3.Gattow, G. and Schröder, H.Z., Anorg. Allg. Chem. 318, 176 (1962).Google Scholar
4.Gattow, G. and Schütze, D.Z., Anorg. Allg. Chem. 328, 44 (1964).CrossRefGoogle Scholar
5.Harwig, H.A., Z. Anorg. Allg. Chem. 444, 151 (1978).CrossRefGoogle Scholar
6.Shuk, P., Wiemhofer, H.D., Guth, U., Gopel, W., and Greenblatt, M., Solid State Ionics 89, 179 (1996).Google Scholar
7.Takahashi, T., Iwahara, H., and Arao, T., J. Appl. Electrochem. 5, 189 (1975).Google Scholar
8.Datta, R.K. and Meehan, J.P., Z. Anorg. Allg. Chem. 383, 328 (1971).Google Scholar
9.Joshi, A.V., Kulkarni, S., Nachlas, J., Diamond, J., and Weber, N., J. Mater. Sci. 25, 1237 (1990).CrossRefGoogle Scholar
10.Fung, K.Z. and Vikar, A.V., J. Am. Ceram. Soc. 74, 1970 (1991).CrossRefGoogle Scholar
11.Fung, K.Z., Chen, J., and Vikar, A.V., J. Am. Ceram. Soc. 76, 2405 (1993).CrossRefGoogle Scholar
12.Bovin, J.C. and Thomas, D.J., Solid State Ionics. 3/4, 457 (1981).CrossRefGoogle Scholar
13.Bovin, J.C. and Thomas, D.J., Solid State Ionics. 5, 523 (1981).CrossRefGoogle Scholar
14.Watanabe, A. and Kikuchi, T., Solid State Ionics. 21, 287 (1986).CrossRefGoogle Scholar
15.Toraya, H., Yoshimura, M., and Somiya, S., J. Am. Ceram. Soc. 67, C–119 (1984).CrossRefGoogle Scholar
16.Schmid, H.K., J. Am. Ceram. Soc. 70, 1367 (1987).CrossRefGoogle Scholar
17.Greaves, C. and Blower, S., Mater. Res. Bull. 23, 1001 (1988).CrossRefGoogle Scholar
18.Christensen, A.N. and Hazell, R.G., Acta Chemica Scandinavica 21, 481 (1967).Google Scholar
19.Sato, Y., Imaeda, S., and Sato, K., Thermochimica Acta 133, 79 (1988).CrossRefGoogle Scholar