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J. Korean Ceram. Soc. > Volume 39(10); 2002 > Article
Journal of the Korean Ceramic Society 2002;39(10): 912.
doi: https://doi.org/10.4191/kcers.2002.39.10.912
Ni-Mn-Co-Fe 산화물 후막 NTC 서미스터의 제조 및 전기적 특성
박경순, 방대영, 윤성진, 최병현1
세종대학교 신소재공학과 및 신소재연구소
1요업기술원 신기능재료연구부
Fabrication and Electrical Properties of Ni-Mn-Co-Fe Oxide Thick Film NTC Thermistors
Kyeong-Soon Park, Dae-Young Bang, Sung-Jin Yun, Byung-Hyun Choi1
Department of Advanced Materials Engineering and Center for Advanced Materials, Sejong University
1Department of Advanced Functional Materials Research, Korea Institute of Ceramic Engineering and Technology
Ni-Mn-Co-Fe oxide thick films were coated on an alumina substrate by screening printing technique. The microstructure and electrical properties of the thick films, as a function of composition and sintering temperature, were investigated. The components of the NTC thick films sintered at 1150${circ}C$ were distributed homogeneously. On the other hand, in the case of the NTC thick films sintered at 1200 and 1250${circ}C$, Co element was distributed homogeneously, but Ni, Mn and Fe elements were distributed heterogeneously, resulting in the formation of Ni rich and Mn-Fe rich regions. All the thick film NTC thermistors prepared showed a linear relationship between log resistance (log R) and the reciprocal of absolute temperature (1/T), indicative of NTC characteristics. At a given NiO and $Mn_3O_4$ content, the resistance, B constant and activation energy of $(Ni_{1.0}Mn_{1.0}Co_{1-x}Fe_x)O_4$ (0.25${le}$x${le}$0.75) and $(Ni_{0.75}Mn_{1.25}Co_{1-x}Fe_x)O_4$ (0.25${le}$x${le}$0.75) thermistors increased with increasing $Fe_2O_3$ content.
Key words: Ni-Mn-Co-Fe oxide, Thick films, Screening printing, NTC thermistors, Resistance, B constant
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