Articles
  • Structural and electrical properties of K(Ta0.62Nb0.38)O3/BiFeO3 multilayer films for electrocaloric devices

  • Jeong-Eun Lima,†, Myung-Gyu Leea,b,†, Byeong-Jun Parka, Sam-Haeng Leea,b, Joo-Seok Parkb, Young-Gon Kimc 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
    cDept. of Electronics, Chosun College of Science and Technology, Gwangju 61453, 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/BFO multilayer films were manufactured using the spin-coating method on Pt/Ti/SiO2/Si substrate with KTN(62/38) and BFO metal alkoxide solutions. The mean thickness of the multilayer films was about 420-450 nm. A rough interfacial layer was observed at the interface between the lower substrate and the film when sintered at 650oC. Dense microstructures without pores inside of the films were shown via TEM analysis, and an interface between the KTN and BFO layers was clearly observed. The Curie temperature was about 16oC. Dielectric constant and dielectric loss were 1380 and 0.384 at 20oC, respectively. Coercive field of the 2-layer and 6-layer films were 72.6 and 80.4 kV/cm at room temperature, respectively. ΔT and EC coefficient of the 6-layer films sintered at 630oC were 1.96oC and 0.13×10-6 oCmV-1, respectively


Keywords: Multilayer films, BFO, KTN, Electrocaloric effect, Sol-gel method

This Article

  • 2022; 23(5): 583-588

    Published on Oct 31, 2022

  • 10.36410/jcpr.2022.23.5.583
  • Received on Jan 11, 2022
  • Revised on Apr 22, 2022
  • Accepted on May 4, 2022

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