한국전기전자재료학회:학술대회논문집 (Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference)

한국전기전자재료학회 (The Korean Institute of Electrical and Electronic Material Engineers)
권호 표지

Impedance Analysis of Resistance Anomaly of $BaTiO_3$ based PTC thermistor

  • Chun, Myoung-Pyo (Korea Institute of Ceramic Engineering and Technology(KICET)) ;
  • Myoung, Seong-Jae (Korea Institute of Ceramic Engineering and Technology(KICET)) ;
  • Nam, Joong-Hee (Korea Institute of Ceramic Engineering and Technology(KICET)) ;
  • Cho, Jeong-Ho (Korea Institute of Ceramic Engineering and Technology(KICET))
  • 발행 : 2009.06.18
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

The effect of Re-oxidation on the PTCR properties of Sm-doped barium titanate ceramics was investigated by means of impedance spectroscopy. Electrical properties such as resistance vs. temperature, I-V curve were measured and microstructure was observed with SEM photography. Sample was fabricated with thick film process such as tape casting of green sheet, screen printing of electrode pattern, stacking, firing in reduced atmosphere and re-oxidation, etc. As the temperature of re-oxidation increases, resistance jump as a function of temperature enhances but resistance at room temperature increases. These behavior of resistance as a function of temperature, dependent on the re-oxidation condition, is analyzed with Cole-Cole impedance plot and is shown to be related with the degree of oxidation of grain boundary regardless of grain core during re-oxidation process of sample.

키워드