Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of ZrO2 Addition on the Microstructure and Electrical Properties of Ni-Mn Oxide NTC Thermistors

Ni-Mn 산화물 NTC 서미스터의 미세구조와 전기적 특성에 미치는 ZrO2첨가의 효과

  • 박경순 (세종대학교 신소재공학과?신소재연구소) ;
  • 방대영 (세종대학교 신소재공학과·신소재연구소) ;
  • 윤성진 (세종대학교 신소재공학과·신소재연구소) ;
  • 최병현 (요업기술원 신기능재료연구부)
  • Published : 2003.01.01
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Abstract

The effect of$ZrO_2$addition on the microstructure and electrical properties of Ni-Mn oxide NTC thermistors was studied. Major phases present in the sintered bodies of $Ni_{1.0}Mn_{2-x}Zr_xO_4$ were the solid solutions of Ni-Mn-Zr oxides with a cubic spinel structure and the $ZrO_2$ with a tetragonal structure. The $ZrO_2$ was formed by the partial decomposition or incomplete formation of the Ni-Mn-Zr oxides during sintering. With increasing the amount of added $ZrO_2$, the $ZrO_2$ phase increased. The relationship between log resistivity (log p) and the reciprocal of absolute temperature (1/T) of the NTC thermistors prepared was linear, indicative of NTC characteristics. The resistivity, B constant and activation energy of the thermistors increased with increasing $ZrO_2$ content.

Ni-Mn 산화물 NTC 서미스터의 미세구조와 전기적 특성에 미치는 Zr $O_2$ 첨가의 효과를 연구하였다. Zr $O_2$를 포함하는 Ni-Mn-Zr 산화물 소결체의 주요 상은 입방정 스피넬 구조를 가지는 NiO-Mn$_3$ $O_4$-Zr $O_2$의 고용체와 정방정 결정구조를 가지는 Zr $O_2$ 상이였다. Zr $O_2$의 첨가량이 증가함에 따라 Ni-Mn-Zr산화물의 고용체를 형성하지 못하고 생성된 Zr $O_2$의 양이 증가하였다. NiO-Mn$_3$ $O_4$-Zr $O_2$ NTC 서미스터에 있어서 절대온도 역수(l/T)에 대한 로그 비저항(log $ho$)은 직선적인 관계가 있었고, 비저항, B$_{140}$320/정수 및 활성화 에너지는 Zr $O_2$ 함량이 증가함에 따라 크게 증가하였다.

Keywords

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