Chiang Mai Journal of Science

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The Bi₂O₃+Fe₂O₃ (sample 1) and ZrO₂+MnO₂ (sample 2) materials  were prepared by standard ceramic techniques and identified the phase by XRD techniques. The PTC effect was tested. The both samples were applied to be temperature sensor. The sample 1 exhibits PTC effect from 25 to 110°C that the positive temperature coefficient of the resistance (a) was +183.24 %/°C. The maximum resistance was 22.24 MΩ at 110 °C. The sample 2 exhibits PTC effect from 25 to 130°C that the positive temperature coefficient of the resistance (a) was +7.08 %/°C. The maximum resistance was 9.08 MΩ  at  130°C.  The  PTC  effect  was similar to barium titanate. The PTC effect in the Bi₂O₃+Fe₂O₃ and ZrO₂+MnO₂ samples were discovered in the first time. The prepare samples and the temperature monitoring with computer system can measure the temperature in the range 25 °C to 65 °C (sample 1) and 25 °C to 85 °C (sample 2). The working temperature of these sensors are in the PTC region which are very sensitive to heat.

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