Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Fabrication and Characterization of Hybrid NTC Thermistor Films with Conducting Oxide Particles by an Aerosol-Deposition Process

상온 분사 공정에 의한 산화물전도 입자 복합 하이브리드 NTC 서미스터 필름의 제작 및 특성

  • 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)
  • 강주은 (한국기계연구원 부설 재료연구소 기능세라믹연구실) ;
  • 류정호 (한국기계연구원 부설 재료연구소 기능세라믹연구실) ;
  • 최종진 (한국기계연구원 부설 재료연구소 기능세라믹연구실) ;
  • 윤운하 (한국기계연구원 부설 재료연구소 기능세라믹연구실) ;
  • 김종우 (한국기계연구원 부설 재료연구소 기능세라믹연구실) ;
  • 안철우 (한국기계연구원 부설 재료연구소 기능세라믹연구실) ;
  • 최준환 (한국기계연구원 부설 재료연구소 기능세라믹연구실) ;
  • 박동수 (한국기계연구원 부설 재료연구소 기능세라믹연구실) ;
  • 김양도 (부산대학교 재료공학과)
  • Received : 2012.10.04
  • Accepted : 2012.12.17
  • Published : 2013.01.31
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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

References

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