Articles
  • Structural and electrical properties of La(Sr,Ca)MnO3 ceramics for NTC thermistors

  • Eun-Hui Kima,†, Sam-Haeng Leeb,c,†, Byeong-Jun Parkb, Jeong-Eun Limb, Myung-Gyu Leeb,c, Joo-Seok Parkc, Byung-Cheul Kimd and Sung-Gap Leea,b,*

  • aDept. of Ceramics Engineering, Gyeongsang National University, Jinju 52828, Korea
    bDept. of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University, Jinju 52828, Korea
    cBusiness Support Division, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, Korea
    dDept. of Convergence Electronic Engineering, Gyeongsang National University, Jinju 52828, Korea

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

La0.7(Sr0.3-xCax)MnO3 (0.1≤x≤0.25) ceramics were prepared using solid-state sintering. XRD measurements showed that all specimens showed rhombohedral polycrystalline structures. As the amount of Ca increased from 0.1 mol to 0.25 mol, sintered densities decreased from 5.8888 g/cm3 to 5.5829 g/cm3. All specimens exhibited excellent NTCR properties of approximately 0.445-0.421 %/oC. The TCR property, B25/65 constant, and resistivity at room temperature of the LSMO specimen doped with 0.2 mol Ca were 0.439 %/oC, 469 K, and 3.94 x 104 Ω-cm, respectively


Keywords: La(Sr,Ca)MnO3, Thermistors, Hopping conduction, Structural properties, Electrical properties

This Article

  • 2021; 22(6): 692-696

    Published on Dec 31, 2021

  • 10.36410/jcpr.2021.22.6.692
  • Received on Aug 10, 2021
  • Revised on Sep 14, 2021
  • Accepted on Sep 25, 2021

Correspondence to

  • Sung-Gap Lee

  • aDept. of Ceramics Engineering, Gyeongsang National University, Jinju 52828, Korea
    bDept. of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University, Jinju 52828, Korea
    Tel : +82-10-2686-4427 Fax: +82-55-772-1689

  • E-mail: lsgap@gnu.ac.kr