Properties of Spinel Ferrites for NTC Thermistor

NTC 서미스터용 스페넬 페라이트의 특성

  • 오영우 (경남대학교 공대 무기재료공학과) ;
  • 허정섭 (경남대학교 공대 무기재료공학과) ;
  • 김현식 (경남대학교 공대 무기재료공학과) ;
  • 이승관 (경남대학교 공대 무기재료공학과)
  • Published : 1998.07.01

Abstract

$Mn{1-X}Fe{2+X}O_4, Mg_{1-X}Fe_{2+X}O_4$ (x=0.0, 0.025, 0.1, 0.2) for negative temperature coefficient (NTC) thermistor was prepared by calcination at $800^{\circ}C$ and sintering at form 1100 to $1250^{\circ}C$ with $50^{\circ}C$ intervals. The best linear property was obtained in the Mn-based sample sintered at $1200^{\circ}C$ with x=0.0 composition. Temperature coefficient of resistance, $\alpha$, was $-5.6%/^{\circ}C$ in the Mn-based sample, $-5.2%/^{\circ}C$ in the MM-based sample, and $-1.6%/^{\circ}C$ in the Mg-based sample. thermistor parameter, B, was in the range of 2665~7780 K. The results show the possibility that Mn-Ni-Co based thermistor could be substituted by the composition used in this study.

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