The temperature dependence of electrical resistance of several spinel‐type oxides was measured in exhaust gases of air‐methane combustion, to evaluate the potential of the oxides as an air/fuel stoichiometric oxygen sensor. The results are discussed in terms of sensitivity and response time at the stoichiometric combustion point. It was found that the sensitivity as well as the response time is markedly affected by point defect structures of the oxide specimens. The response time is also related to the catalytic activity of the oxides for complete oxidation of methane. Among the specimens studied, the ZnCr 2 O 4 + Cr 2 O 3 (1.0:0.1 molar ratio) is the most promising as the oxygen sensor, because it exhibits the largest resistance changes of more than 3 orders of magnitude and shortest response times of about 0.5 s when the combustion mixture is switched between the air‐rich versus fuel‐rich composition.
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Shimizu et al. (1990) studied this question.
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