Abstract
Limiting‐current‐type oxygen sensors using (BCG) ceramics as electrolytes were constructed on a trial basis and their sensing properties investigated in order to develop a new oxygen sensor to replace the zirconia type. BCG ceramics exhibited high conductivity in the temperature range 200–1000°C, and it was verified that the oxide ion could be a conductive carrier in BCG in oxygen at low temperatures (300°C). The oxygen sensors using BCGs worked at 300°C, and their output currents linearly increased with an increase in oxygen concentration in the range 1–22%. They could respond within 30 s between 1 and 21%, and humidity only slightly affected sensing performance. BCG seems to be a promising electrolyte material for an oxygen sensor operating at low temperatures (300°C).
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