Current-voltage Characteristics of PTC Ceramics by Changing Donor Concentration and Specimen Thickness

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J. Korean Ceram. Soc. > Volume 28(8); 1991 > Article

Journal of the Korean Ceramic Society 1991;28(8): 619.

Donor 첨가량과 시편두께에 따른 PTC 세라믹스의 전류-전압 특성

한응학, 강영석, 박순자

서울대학교 무기재료공학과

Current-voltage Characteristics of PTC Ceramics by Changing Donor Concentration and Specimen Thickness

ABSTRACT

The current-voltage characteristics of the semiconducting BaTiO3 ceramics are measured in the range of 0.01∼100 Volt. Non ohmic behavior was observed above Tc. This behavior is not dependent on specimen thickness and is not observed at the incomplete semiconducting sepcimen. From this experiment, non-ohmic behavior of PTC is attributed to Heywang's potential barrier not to space change limited current. In the low voltage range, current-voltage characteristics of PTC ceramics can be explained by Heywang model.