| Current-voltage Characteristics of Ceramics with Positive Temperature Coefficient of Resistance |
| Yong-Gen Li, Sung-Gurl Cho1 |
Department of Inorganic Materials Engineering, Gyeongsang National University
1Div. Electric and Electronic Engineering and ReCAPT, Gyeongsang National University |
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| ABSTRACT |
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A current-voltage relation for Positive Temperature Coefficient of Resistance (PTCR) ceramic was derived and compared with the experimental data. The new current-voltage relation was developed based on Heywangs double Schottky barrier model and a bias distribution across the grain boundary. The voltage limitation V < 4${Phi}$$sub$b/ suggested by Heywang is no longer necessary in the new expression for the voltage dependence of the resistance. The pulsed voltages were applied to the PTCR ceramic specimen in order to avoid possible temperature variation during the measurement. |
| Key words:
PTCR effect, Barium titanate, Ceramics, Current-voltage relation, Grain boundary, DC bias |
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