3. PTC thermistors
3.1 Conductivity origin
PTC thermistors are ferroelectric, semiconducting ceramics. They exhibit an "anomaly" in the variation of their resistance at the Curie temperature TC of the material corresponding to the ferro-para-electric transition temperature. Above this temperature (see figure 2), resistance rises sharply (in the order of 10 to 100% / °C), then reaches a maximum before decreasing. In other words, the thermistor changes from a conductive to an insulating state within a few tens of degrees: it behaves...
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PTC thermistors
Conclusion
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