Abstract
Oxygen sensing properties of Er123 ceramic material utilizing hot‐spot phenomenon have been investigated. Bulk Er123 ceramic with relative density of 72 % was synthesized using solid‐state method and single‐phase structure of the material was confirmed by X‐ray diffraction. The Er123 sensor was fabricated by cutting the bulk sample into a rectangular rod shape. I‐V characterizations of the sensor before and after appearance of the hot spot were conducted in a chamber with controlled flow rate and partial pressure of oxygen and nitrogen gases. After appearance of the hot spot, the output current strongly depended on oxygen partial pressure (pO2) at a particular selected voltage. The sensor showed good sensing properties with minimum required electric field of about 1.7 V/cm for 0.025% to 100% pO2. The sensor showed very good reproducibility and stability of output current. The oxygen sensing properties are explained in terms of absorption of oxygen gas by the hot spot before dissociating into oxide ions and holes. The conductivity for 5% to 100% pO2 showed good agreement with theoretically predicted proportional relation of conductivity to pO21/6 derived from the mass action law.
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