Articles
  • Electrocaloric effect of K(Ta,Nb)O3/BaTiO3 multilayer thin films prepared by sol-gel method

  • Byeong-Jun Parka, Jeong-Eun Lima, Ji-Su Yuka, Sam-Haeng Leea,b, Myung-Gyu Leea,b, Joo-Seok Parkb and Sung-Gap Leea,*

  • aDept. of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University, Jinju 52828, Korea
    bBusiness 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

KTN/BT multilayer films were fabricated using the sol-gel method and the spin coating method. The average thickness of the single-coated film was about 62 to 67 nm and the average grain size was about 92 to 95 nm. TEM analysis made it possible to observe a clear image difference between the KTN layer and BT layer due to the difference in composition and crystal structure. As the number of coatings increased, the dielectric constant increased and the Curie temperature increased. The 6-layer KTN/BT multilayer film exhibited the highest dielectric constant of about 2530 at a transition temperature of 26 °C. The 6-layer KTN/BT multilayer films showed a remanent polarization and a coercive field of 9.2 μC/cm2 and 91 kV/cm, respectively, at around room temperature. The ΔT and ΔT/ΔE of the 5-layer KTN/BT multilayer film with an applied electric field of 150 kV/cm were 0.72 K and 4.8 mK·cm/kV, respectively, at around room temperature.


Keywords: K(Ta,Nb)O3/BaTiO3, Multilayer thin films, Electrocaloric effect, Structural properties, Electrical properties.

This Article

  • 2024; 25(1): 48-55

    Published on Feb 29, 2024

  • 10.36410/jcpr.2024.25.1.48
  • Received on Oct 5, 2023
  • Revised on Nov 27, 2023
  • Accepted on Nov 29, 2023

Correspondence to

  • Sung-Gap Lee

  • Dept. 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