Articles
  • Electrocaloric effect in heterolayered potassium tantalate niobate thin films prepared by sol-gel method

  • Byeong-Jun Parka,†, Sam-Haeng Leeb,c,†, Ji-Won Kimb, Joo-Seok Parkc and Sung-Gap Leeb,*

  • aDept. of Ceramic Engineering, Gyeongsang National University, Jinju 52828, Republic of Korea
    bDept. of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University, JinJu 52828, Republic of Korea
    cBusiness Cooperation Center, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, Republic of 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

Heterolayered potassium tantalate niobate(KTN(70/30)/KTN(30/70)) thin films on Pt/Ti/SiO2/Si substrates prepared by the sol-gel process and spin coating method. When sintered at 700 oC or higher, the X-ray diffraction intensities of the perovskite phase were greatly increased, and it was observed as the main phase of the KTN heterolayered thin film. As the sintering temperature increased from 650 oC to 800 oC, the average grain size increased from 146nm to 380 nm, and the average thickness of the KTN films coated six times was about 394-441 nm. Dielectric constant and dielectric loss of the KTN film sintered at 750 oC and room temperature showed good properties of about 2850 and 0.573, respectively, and all films exhibited the typical dielectric relaxation characteristics. The phase transition temperature of KTN thin film was around 12-13 oC. Remanent polarization and the coercive field of KTN film sintered at 750 oC showed excellent properties of 23.98 μC/cm2 and 35.41 kV/cm, respectively. Adiabatic temperature changes (ΔT) and electrocaloric strength of the KTN films sintered at 750 oC at 60 oC were 2.67 oC and 0.012 KcmkV-1, respectively


Keywords: Potassium tantalite niobate, Electrocaloric effect, Thin film, Solgel method

This Article

  • 2021; 22(2): 214-220

    Published on Apr 30, 2021

  • 10.36410/jcpr.2021.22.2.214
  • Received on Sep 11, 2020
  • Revised on Nov 3, 2020
  • Accepted on Nov 11, 2020

Correspondence to

  • Sung-Gap Lee

  • Dept. of Materials Engineering and Convergence Technology, RIGET, Gyeongsang National University, JinJu 52828, Republic of Korea
    Tel : +82-10-2686-4427 Fax: +82-55-772-1689

  • E-mail: lsgap@gnu.ac.kr