Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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The Microstructural and Electrical Properties of Ni-Mn-Co Oxide for the Application of NTC Thermistors

NTC 서미스터로 응용을 위한 Ni-Mn-Co 산화물의 미세구조와 전기적 특성

  • Kim, Kyeong-Min (Department of Materials Engineering and Convergence Technology, Engineering Research Institute, Gyeongsang National University) ;
  • Lee, Sung-Gap (Department of Materials Engineering and Convergence Technology, Engineering Research Institute, Gyeongsang National University) ;
  • Kwon, Min-Su (Department of Materials Engineering and Convergence Technology, Engineering Research Institute, Gyeongsang National University) ;
  • Kim, Young-Gon (Department of Electronics, Chosun College of Science and Technology)
  • 김경민 (경상대학교 공학원 나노신소재융합공학과) ;
  • 이성갑 (경상대학교 공학원 나노신소재융합공학과) ;
  • 권민수 (경상대학교 공학원 나노신소재융합공학과) ;
  • 김영곤 (조선이공대학교 전자과)
  • Received : 2017.02.02
  • Accepted : 2017.03.29
  • Published : 2017.06.01
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Abstract

In this paper, we investigated the effect of Co content on the microstructural and electrical properties of $Ni_{0.79}Mn_{2.21-x}Co_xO_4$ (x=0 to 0.25) specimens. Solid-state reaction was used to prepare the bulk specimens. XRD (X-ray diffraction) patterns showed that all compositions had a cubic spinel phase. As a result of the microstructural properties, FE-SEM(field-emission scanning electron microscopy) analysis showed a dense structure, and the mean grain size increased from $5.24{\mu}m$ to $7.33{\mu}m$ with an increase of Co content from x=0 to 0.25. All specimens exhibited the typical NTC thermistor characteristics as the electrical resistance exponentially decreased with increasing temperature. The resistivity and the B-value of $Ni_{0.79}Mn_{1.96}Co_{0.25}O_4$ were $2959{\Omega}{\cdot}cm$ and 3719, respectively.

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References

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