Abstract
ABSTRACTThe 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.
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