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http://dx.doi.org/10.4313/JKEM.2016.29.8.470

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

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)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.29, no.8, 2016 , pp. 470-475 More about this Journal
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
Temperature sensors; Zn-Mn-O oxide; Structural properties; Electrical properties; Mixed-oxide method;
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