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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Structural and Electrical Properties of Zn-Mn-O System Ceramics for the Application of Temperature Sensors

온도센서로의 응용을 위한 Zn-Mn-O계 세라믹의 구조적, 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) ;
  • Lee, Dong-Jin (Department of Materials Engineering and Convergence Technology, Engineering Research Institute, Gyeongsang National University) ;
  • Park, Mi-Ri (Department of Materials Engineering and Convergence Technology, Engineering Research Institute, Gyeongsang National University) ;
  • Kwon, Min-Soo (Department of Materials Engineering and Convergence Technology, Engineering Research Institute, Gyeongsang National University)
  • 김경민 (경상대학교 공학원 나노신소재융합공학과) ;
  • 이성갑 (경상대학교 공학원 나노신소재융합공학과) ;
  • 이동진 (경상대학교 공학원 나노신소재융합공학과) ;
  • 박미리 (경상대학교 공학원 나노신소재융합공학과) ;
  • 권민수 (경상대학교 공학원 나노신소재융합공학과)
  • Received : 2016.05.26
  • Accepted : 2016.07.04
  • Published : 2016.08.01
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Abstract

In this study, $Zn_xMn_{3-x}O_4$ (x=0.95~1.20) specimens were prepared by using a conventional mixed oxide method. All specimens were sintered in air at $1,200^{\circ}C$ for 12 h and cooled at a rate of $2^{\circ}C/min$ to $800^{\circ}C$, subsequently quenching to room temperature. We investigated the structural and electrical properties of $Zn_xMn_{3-x}O_4$ specimens with variation of ZnO amount for the application of NTC thermistors. As results of X-ray diffraction patterns, all specimens showed the formation of a complete solid solution with tetragonal spinel phase. And, the second phase was observed by the solubility limit of Zn ions in $x{\geq}1.10$ composition. The average grain size was increased from $2.72{\mu}m$ to $4.18{\mu}m$ with increasing the compositional ratio of Zn ion from x=0.95 to 1.20, respectively. $Zn_{1.10}Mn_{1.90}O_4$ specimen showed the minimum electrical resistance of $57.5k{\Omega}$ at room temperature and activation energy of 0.392 eV.

Keywords

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