Articles
  • Structural and electrical properties of La-Sr-Mn-O ceramics with Bi3+ content for thermistor devices

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

  • aMajor in Ceramic Engineering, School of Materials Science and Engineering, Gyeongsang National University, Jinju 52828, Korea
    bDepartment of Materials Engineering and Convergence Technology, Research Institute for Green Convergence Technology, Gyeongsang National University, Jinju 52828, Korea
    cBusiness Support Division, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, 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

La0.7Sr0.3-xBixMnO3 (LSBMO) (0.025 ≤ x ≤ 0.15) films are fabricated by a sol-gel method and spin-coating method. All of the fabricated films have typical polycrystalline perovskite structures. In addition, no preferential orientation or impurity could be observed. The surface SEM images show almost homogeneous and uniform microstructures and the average thickness for the LSBMO films is approximately 230 to 260 nm. When the resistivity is measured at room temperature, the TCR and B85/25-values gradually increases as the amount of Bi3+ increased, and the highest values of 0.023 mΩ·cm, 0.31%/°C and 299 K are obtained in the La0.7Sr0.225Bi0.075MnO3 thin films. Polycrystalline LSBMO films follow the variable-range hopping (VRH) conduction model as they show electron-electron scattering and electron-phonon interactions for thermal stimulation


Keywords: La0.7Sr0.3-xBixMnO3 films, Sol-gel method, Structural properties, Electrical properties, Thermistor

This Article

  • 2023; 24(4): 650-654

    Published on Aug 31, 2023

  • 10.36410/jcpr.2023.24.4.650
  • Received on Apr 12, 2023
  • Revised on Jul 10, 2023
  • Accepted on Jul 14, 2023

Correspondence to

  • Sung-Gap Lee

  • aMajor in Ceramic Engineering, School of Materials Science and Engineering, Gyeongsang National University, Jinju 52828, Korea
    bDepartment of Materials Engineering and Convergence Technology, Research Institute for Green Convergence Technology, Gyeongsang National University, Jinju 52828, Korea
    Tel : +82-10-2686-4427 Fax: +82-55-772-1689

  • E-mail: lsgap@gnu.ac.kr