Development of Proton Conductors Using Pyrochlore-Perovskite Phase Boundaries

The pyrochlore-perovskite binary systems La^sub 2^Zr^sub 2^O^sub 7^-SrZrO3 and La^sub 2^Zr^sub 2^O^sub 7^-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...

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Bibliographic Details
Published inJournal of materials engineering and performance Vol. 13; no. 3; pp. 303 - 308
Main Authors Speakman, Scott A., Carneim, Robert D., Payzant, Andrew E., Armstrong, Timothy R.
Format Journal Article
LanguageEnglish
Published New York Springer Nature B.V 01.06.2004
Subjects
Composition effects
Conductors
Diffraction
Electrical resistivity
Materials engineering
Phase boundaries
Resistivity
Solubility
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Summary:The pyrochlore-perovskite binary systems La^sub 2^Zr^sub 2^O^sub 7^-SrZrO3 and La^sub 2^Zr^sub 2^O^sub 7^-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 La^sub 2^Zr^sub 2^O^sub 7^ 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 La^sub 2^Zr^sub 2^O^sub 7^ was at least 0.25 mol fraction. Y-doped La^sub 2^Zr^sub 2^O^sub 7^ had the highest electrical conductivity, though no composition exceeded σ=3×10^sup -4^ S/cm at the target temperature of 600 °C. The effectiveness of Y as a dopant in La^sub 2^Zr^sub 2^O^sub 7^ was limited because Y substituted for both La on the A-site and Zr on the B-site.[PUBLICATION ABSTRACT]
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ISSN:1059-9495
1544-1024
DOI:10.1361/10599490419270