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Oxide-Ion Transport in Gadolinium Zirconate - Titanates under High Pressure

Published online by Cambridge University Press:  01 February 2011

Hitoshi Takamura
Affiliation:
Department of Materials Science, Graduate School of Engineering, Tohoku University, 6–6–02 Aoba-yama, Sendai 980–8579, Japan CREST, Japan Science and Technology Agency
Hirofumi Kakuta
Affiliation:
Institute for Materials Research, Tohoku University, 2–2–1 Katahira, Sendai 980–8577, Japan
Atsunori Kamegawa
Affiliation:
Department of Materials Science, Graduate School of Engineering, Tohoku University, 6–6–02 Aoba-yama, Sendai 980–8579, Japan CREST, Japan Science and Technology Agency
Masuo Okada
Affiliation:
Department of Materials Science, Graduate School of Engineering, Tohoku University, 6–6–02 Aoba-yama, Sendai 980–8579, Japan CREST, Japan Science and Technology Agency
Harry L. Tuller
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
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Abstract

The oxide-ion conduction of gadolinium zirconate - titanates, Gd2(Ti1−xZrx)2O7 (GTZ), has been investigated under high pressure in the range of 2 to 6 GPa with the aid of a cubic-anvil-type apparatus. For these pyrochlore compounds, the oxide-ion conductivity at elevated temperatures in the range of 750 to 960 °C decreased with increasing pressure, indicating the presence of a positive activation volume, ΔV. The activation volumes ΔV of GZ (x = 1.0) and GTZ (x = 0.95) were 2.0 and 1.3 cm3/mol, respectively, at 750 °C and decreased with increasing temperature.

Type
Research Article
Copyright
Copyright © Materials Research Society 2005

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References

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