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J. Korean Ceram. Soc. > Volume 40(1); 2003 > Article
Journal of the Korean Ceramic Society 2003;40(1): 11.
doi: https://doi.org/10.4191/kcers.2003.40.1.011
Ni-Mn 산화물 NTC 서미스터의 미세구조와 전기적 특성에 미치는 ZrO2첨가의 효과
박경순, 방대영1, 윤성진1, 최병현2
세종대학교 신소재공학과?신소재연구소
1세종대학교 신소재공학과·신소재연구소
2요업기술원 신기능재료연구부
Effect of ZrO2 Addition on the Microstructure and Electrical Properties of Ni-Mn Oxide NTC Thermistors
ABSTRACT
The effect of$ZrO_2$addition on the microstructure and electrical properties of Ni-Mn oxide NTC thermistors was studied. Major phases present in the sintered bodies of $Ni_{1.0}Mn_{2-x}Zr_xO_4$ were the solid solutions of Ni-Mn-Zr oxides with a cubic spinel structure and the $ZrO_2$ with a tetragonal structure. The $ZrO_2$ was formed by the partial decomposition or incomplete formation of the Ni-Mn-Zr oxides during sintering. With increasing the amount of added $ZrO_2$, the $ZrO_2$ phase increased. The relationship between log resistivity (log p) and the reciprocal of absolute temperature (1/T) of the NTC thermistors prepared was linear, indicative of NTC characteristics. The resistivity, B constant and activation energy of the thermistors increased with increasing $ZrO_2$ content.磩
Key words: Ni-Mn-Zr Oxide, NTC thermistors, Electrical resistivity, B Constant, Sintering, Microstructure
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