Articles
  • Electrocaloric properties of K(Ta0.6Nb0.4)O3/SrTiO3 double layer thin films using metal alkoxides
  • Jung Gyu Parka , Bijay Basneta , Se Young Kimb , In Sub Hanb and Ik Jin Kima,*
  • a Institute for Processing and Application of Inorganic Materials, (PAIM), Department of Materials Science and Engineering, Hanseo University, #46, Hanseo 1-ro, Haemi-myun, Seosan-si, Chungnam 31962, Korea b Korea Institute of Energy Research (KIER), #152, Gajeong-gu, Daejeon 34129, Korea
Abstract
In this study, KTN/STO thin films were fabricated on Pt/Ti/SiO2/Si substrate, as a buffer layer, and their structural and electrical properties were measured according to the number of STO coatings and investigated its applicability to electrocaloric materials. KTN/STO thin films showed a polycrystalline KTN XRD peaks with a pyrochlore phase. However, dependence on the number of STO coatings and pyrochlore phase was not observed. The average grain size was about 80~90 nm, the average thickness of 6-coated KTN thin film was about 320 nm, and the average thickness of the STO thin film coated once was about 50-55 nm. Saturation polarization of K(Ta0.6Nb0.4)O3/SrTiO3 thin films was 24.5 μC/cm2. Electrocaloric temperature change ΔT of K(Ta0.6Nb0.4)O3 thin film showed the maximum value of 3.14 oC at around 76 oC under a high electric field of 332.9 kV/cm.

Keywords: Electrocaloric effect, KTN, Seeding layer, Hysteresis loop, Sol-gel method.

This Article

  • 2018; 19(4): 316-320

    Published on Aug 31, 2018