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http://dx.doi.org/10.4191/kcers.2013.50.1.63

Fabrication and Characterization of Hybrid NTC Thermistor Films with Conducting Oxide Particles by an Aerosol-Deposition Process  

Kang, Ju-Eun (Functional Ceramics Research Group, Korea Institute of Materials Science (KIMS))
Ryu, Jungho (Functional Ceramics Research Group, Korea Institute of Materials Science (KIMS))
Choi, Jong-Jin (Functional Ceramics Research Group, Korea Institute of Materials Science (KIMS))
Yoon, Woon-Ha (Functional Ceramics Research Group, Korea Institute of Materials Science (KIMS))
Kim, Jong-Woo (Functional Ceramics Research Group, Korea Institute of Materials Science (KIMS))
Ahn, Cheol-Woo (Functional Ceramics Research Group, Korea Institute of Materials Science (KIMS))
Choi, Joon Hwan (Functional Ceramics Research Group, Korea Institute of Materials Science (KIMS))
Park, Dong-Soo (Functional Ceramics Research Group, Korea Institute of Materials Science (KIMS))
Kim, Yang-Do (School of Materials Science and Engineering, Pusan National University)
Publication Information
Journal of the Korean Ceramic Society / v.50, no.1, 2013 , pp. 63-69 More about this Journal
Abstract
Negative-temperature coefficient (NTC) thermistors based on nickel manganite spinel ($NiMn_2O_4$) are widely used for many applications, such as sensors and temperature compensators, due to their good thermistor characteristics and stabilities. However, to achieve thermistors with a high NTC B constant, which is an important figure of merit pertaining to the degree of temperature sensitivity, the activation energy should be high such that high resistivity at ambient temperatures results. To obtain a high B constant and low resistivity, Al and Si modified spinel structured $Ni_{0.6}Si_{0.2}Al_{0.6}Mn_{1.6}O_4$ hybrid thick films with the conducting metal oxide of $LaNiO_3$ were fabricated on a glass substrate by aerosol deposition at room temperature (RT). The NTC-$LaNiO_3$ hybrid thick films showed resistivity as low as < $100k{\Omega}\;cm$ at $90^{\circ}C$, which is one or two orders of magnitude lower than that of the monolithic NTC films, while retaining a high B constant of $NiMn_2O_4$ of over 5500 K when 20 wt% $LaNiO_3$ was added without a post-thermal treatment. These phenomena are explained by the percolation threshold mechanism.
Keywords
NTC thermistor; $LaNiO_3$; Thick film; Hybrid; Aerosol-deposition;
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