Effect of MgO Contents on Electrical Properties and Oxygen Sensing Characteristics in Co1-xMgxO Ceramics

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J. Korean Ceram. Soc. > Volume 26(1); 1989 > Article

Journal of the Korean Ceramic Society 1989;26(1): 7.

Co1-xMgxO세라믹스의 MgO함량에 따른 전기적 성질 및 산소가스 감지특성

최현국, 이덕동, 조상희¹

경북대학교 전자공학과
¹경북대학교 재료공학과

Effect of MgO Contents on Electrical Properties and Oxygen Sensing Characteristics in Co1-xMgxO Ceramics

ABSTRACT

The effects of composition ratios and sintering conditions in Co1-xMgxO ceramics on the sintering characteristics, electrical properties and oxygen sensing characteristics were investigated. In the same sintering conditions, porosity decreased with increase of MgO contents. The relationshiop of temperature and resistance in Co1-xMgxO ceramics showed NTC(negative temperature coefficient) characteristics at the temperature range from $700^{circ}C$ to 1,10$0^{circ}C$. In the case of pure CoO, however, the PTC(positive temperature coefficient) characteristics were shown over about 90$0^{circ}C$. The electrical conductivity of Co1-xMgxO ceramics decreased proportionally with decrease of oxygen partial pressure at the range from 1 to 10-4(atm). Particularly, Co0.5Mg0.5O ceramics showed the highest sensitivity to oxygen gas.