The Electrical Properties and Aging Effects on the Composition of Mn-Co-Ni NTC Thermistors

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J. Korean Ceram. Soc. > Volume 38(12); 2001 > Article

Journal of the Korean Ceramic Society 2001;38(12): 1174.

Mn-Co-Ni 산화물계 NTC 서미스터의 조성에 따른 전기적 특성과 경시변화

권정범, 정용근¹, 엄우식¹, 송준광², 유광수

서울시립대학교 재료공학과
¹이노칩테크놀로지
²산업기술시험원 재료평가팀

The Electrical Properties and Aging Effects on the Composition of Mn-Co-Ni NTC Thermistors

ABSTRACT

Mn-Co-Ni oxide system has been used as the NTC thermistors for normal temperature applications. Mn-Co-Ni oxide-based thermistors with various compositions were sintered at 1250$^{circ}C$ for 3 hours and then maintained at 1000$^{circ}C$ for 3 hours. The electrical properties of the thermistors fabricated were measured. In particular the MCN622 composition (Mn$_3$O$_4$60 wt%, Co$_3$O$_4$20 wt%, NiO 20wt%) exhibited the lowest resistivity and relatively high B constant. The MCN721 composition (Mn$_3$O$_4$70wt%, Co$_3$O$_4$20wt%, NiO 10 wt%) showed the higher resistivity than any other compositions. The aging properties of each composition showed comparatively stable characteristics within ${pm}$2%.

Key words: NTC thermistor, Mn-Co-Ni oxide, Aging properties