Abstract
The pyrochlore-perovskite binary systems La2Zr2O7-SrZrO3 and La2Zr2O7-LaYO3 were studied as potential high-temperature proton conductors. X-ray diffraction and direct current conductivity measurements were used to develop empirical relationships between structure and conductivity. The solubilities of Sr in La2Zr2O7 and La in SrZrO3 were low, less than 0.1 mol fraction. The solubility of Zr in LaYO3 was at least 0.125 mol fraction, and the solubility of Y in La2Zr2O7 was at least 0.25 mol fraction. Y-doped La2Zr2O7 had the highest electrical conductivity, though no composition exceeded σ=3×10−4 S/cm at the target temperature of 600 °C. The effectiveness of Y as a dopant in La2Zr2O7 was limited because Y substituted for both La on the A-site and Zr on the B-site.
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