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http://dx.doi.org/10.4191/KCERS.2002.39.10.912

Fabrication and Electrical Properties of Ni-Mn-Co-Fe Oxide Thick Film NTC Thermistors  

Park, Kyeong-Soon (Department of Advanced Materials Engineering and Center for Advanced Materials, Sejong University)
Bang, Dae-Young (Department of Advanced Materials Engineering and Center for Advanced Materials, Sejong University)
Yun, Sung-Jin (Department of Advanced Materials Engineering and Center for Advanced Materials, Sejong University)
Choi, Byung-Hyun (Department of Advanced Functional Materials Research, Korea Institute of Ceramic Engineering and Technology)
Publication Information
Journal of the Korean Ceramic Society / v.39, no.10, 2002 , pp. 912-918 More about this Journal
Abstract
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.
Keywords
Ni-Mn-Co-Fe oxide; Thick films; Screening printing; NTC thermistors; Resistance; B constant;
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