Abstract
Electrical conduction in sintered oxides based on calcium, strontium or barium zirconate at high temperature was investigated electrochemically. When Zr in MZrO 3 (M=Ca, Sr or Ba) was partially replaced by trivalent element such as In, Sc, Y, etc., the resultant solid solutions exhibited protonic conduction under hydrogen-containing atmosphere at elevated temperatures. In general, the protonic conductivities of BaZrO 3- and SrZrO 3-based ceramics were higher than those of CaZrO 3-based one although the values were low compared to those of SrCeO 3 or BaCeO 3-based ceramics. Clear isotope effects in IR spectrum and conductivity were observed between protonated and deuteronated SrZr 0.95Y 0.05O 3−α.
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