Abstract
The I–V characterisation of Ho(Ba2−xSrx)Cu3O7−δ (x = 0, 0·2 and 0·8) ceramic sensor rod with hot spot in flowing oxygen between 0 and 100% pO2 revealed good oxygen response with output current observed to strongly depend on pO2. All the samples showed higher sensitivity to pO2 below 20% with reduced electrical power consumption in Sr substituted rods. The x = 0·2 rod showed improvement in output current stability, reproducibility and transition of output current response between 20 and 100% pO2 compared to the x = 0 rod. Conductivity was found to be proportional to above 60% for x = 0 rod and above 40% for Sr substituted rods, while lower pO2 conductivity was proportional to , in agreement with the mass action law indicating difference in oxygen ionisation. The results are also discussed in terms of the possible influence of hot spot temperature on the structure of Ho123 and changes in oxygen activation energy as a result of the difference in ionic sizes between Ba2+ and Sr2+.
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