Oxygen response of hot spot on DyBa 2 Cu 3 O 72x (Dy123) ceramic sensors fabricated under different heat treatments has been studied. Sensor rods A and B were fabricated from presintered bulk Dy123 samples heated for 48 h at around 900 and 960uC respectively. Sensor rod C on the other hand was prepared using similar heat treatment as sample A but was reheated at around 910uC for 24 h after being fabricated into rod shape. For samples A and B, it was observed that increasing the sintering temperature reduced the voltage at peak current by half but only slightly reduced the power consumption. In terms of durability the best performance is shown by sample A. Sample C showed the largest reduction in voltage at peak current and the lowest power consumption but it was the least durable. The effect of heat treatment on I-V behaviour was discussed in terms of differences in microstructure and initial oxygen content of the samples. Oxygen sensing response for sensor B showed that the output current strongly depended on oxygen partial pressure (pO 2 ) with good stability and reproducibility with response time of y5 s. The relation between output current and pO 2 showed a good agreement with the ideal case of oxygen excess materials, derived from mass action law.
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