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 (La,Nd,Sr)MnO3 Ceramics for NTC Thermistor Devices

  • Shin, Kyeong-Ha (Department of Materials Engineering and Convergence Technology, Research Institute for Green Convergence Technology (RIGET), Gyeongsang National University) ;
  • Park, Byeong-Jun (Department of Materials Engineering and Convergence Technology, Research Institute for Green Convergence Technology (RIGET), Gyeongsang National University) ;
  • Lim, Jeong-Eun (Department of Materials Engineering and Convergence Technology, Research Institute for Green Convergence Technology (RIGET), Gyeongsang National University) ;
  • Lee, Sam-Haeng (Department of Materials Engineering and Convergence Technology, Research Institute for Green Convergence Technology (RIGET), Gyeongsang National University) ;
  • Lee, Myung-Gyu (Department of Materials Engineering and Convergence Technology, Research Institute for Green Convergence Technology (RIGET), Gyeongsang National University) ;
  • Park, Joo-Seok (Business Support Division, Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, Sung-Gap (Department of Materials Engineering and Convergence Technology, Research Institute for Green Convergence Technology (RIGET), Gyeongsang National University)
  • Received : 2022.02.18
  • Accepted : 2022.03.07
  • Published : 2022.05.01
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Abstract

(La0.5Nd0.2Sr0.3)MnO3 specimens were prepared by a solid-state reaction. In all specimens, X-ray diffraction patterns of an orthorhombic structure were shown. The fracture surfaces of (La0.5Nd0.2Sr0.3)MnO3 specimens showed a transgranular fracture pattern be possibly due to La ions (0.122 nm) as a perovskite A-site dopant substituting for Nd ions (0.115 nm) having a small ionic radius. The full-width at half maximum (FWHM) of the Mn 2p XPS spectra showed a value greater than that [8] of the single valence state, which is believed to be due to the overlapping of Mn2+, Mn3+, and Mn4+ ions. The dependence of Mn 2p spectra on the Mn3+/Mn4+ ratio according to sintering time was not observed. Electrical resistivity resulted in the minimum value of 100.7 Ω-cm for the specimen sintered for 9 hours. All specimens show a typical negative temperature coefficient of resistance (NTCR) characteristics. In the 9-hour sintered specimen, TCR, activation energy, and B25/65-value were -1.24%/℃, 0.19 eV, and 2,445 K, respectively.

Keywords

Acknowledgement

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2020R1A6A1A03038697) and This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (2021R1I1A3052426).

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