Abstract
Series of Ca2+ ion‐doped high‐entropy [(La0.25Nd0.25Sm0.25Eu0.25)1−xCax]2Zr2O7−δ (x = 0.025, 0.05, 0.075, 0.1, and 0.2) materials are prepared through a traditional solid‐state reaction method. The solubility of Ca is revealed to be x = 0.075, which is higher than that in the cases with single lanthanide on the A‐site of A2Zr2O7‐based pyrochlore materials. The study of electrical properties discloses that the conductivities of [(La0.25Nd0.25Sm0.25Eu0.25)1−xCax]2Zr2O7−δ increased with Ca‐doping level and dominated by oxide ion conduction, without noticeable proton conduction. Good chemical stability is revealed for these materials under a wet CO2 atmosphere.
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