5. Glossary
Self-heating effects
Heating of NTC ceramics by Joule effect (in the high-voltage zone of the I = f (V) curve), leading to a reduction in resistance and an increase in current.
Polycrystalline ceramic
Dense material obtained from a powder shaped and sintered at a temperature below its melting point.
Temperature coefficient B or β (parameter equation: B or β) expressed in K
Calculated relationship between two temperatures :
B = T1T2/(T2 – T1) × log (R1/R2)
Switching temperature
For a PTC developed with a BaTiO3-based material, a significant jump in resistivity is observed around the Curie transition
Curie point temperature
For a dielectric, this is the temperature of the ferroelectric-paraelectric (quadratic-cubic) transition.
Thermistor CTN (Coefficient...
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