A perovskite‐type oxide of doped with Sr and Mg exhibits a high oxide ion conductivity over a wide range of oxygen partial pressures. In this study, the application of ‐based oxide as the electrolyte of a potentiometric oxygen sensor was investigated. It became clear that silver is the most effective electrode for decreasing the operating temperature. Although a temperature higher than 800 K is required when a conventional ‐stabilized electrolyte is used, an operating temperature as low as 600 K is adequate when at X = 0.1 and 0.2 is used. The open‐circuit potential was slightly smaller than that estimated with the Nernst equation. There was agreement with the Nernst equation down to 673 K when Nd‐doped ‐based oxide was used. Moreover, 90% of the response was attained within 15 s at 673 K for the sensor with Nd‐doped ‐based oxide.
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Ishihara et al. (1997) studied this question.