Abstract
Electrical conductivity measurements were made on the pyrochlore compounds (Gd1−xCax)2Sn2O7 (x =0, 0.0036, 0.0057, 0.03) as a function of temperature, oxygen partial pressure and Ca doping concentration. An effective Frenkel constant and oxygen vacancy mobility were derived. Intrinsic anion disorder was found to be lower than the expected value based on the relative radii of the cations in the A and B sites (A2B2O7). Low oxygen vacancy mobilities as well as low anion disorder resulted in considerably lower ionic conductivities in GdsSn2O7 relative to the previously studied Gd2(Ti1−xZrx)2O7 system. The temperature and composition dependence of the p-type electronic conductivity were evaluated and the oxidation enthalpy was derived.
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