Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Enhancement of electromechanical properties in lead-free (1-x)K0.5Na0.5O3-xBaZrO3 piezoceramics

  • Duong, Trang An (School of Materials Science and Engineering, University of Ulsan) ;
  • Nguyen, Hoang Thien Khoi (School of Materials Science and Engineering, University of Ulsan) ;
  • Lee, Sang-Sub (School of Materials Science and Engineering, University of Ulsan) ;
  • Ahn, Chang Won (Department of Physics and EHSRC, University of Ulsan) ;
  • Kim, Byeong Woo (Department of Electrical Engineering, University of Ulsan) ;
  • Lee, Jae‒Shin (School of Materials Science and Engineering, University of Ulsan) ;
  • Han, Hyoung‒Su (School of Materials Science and Engineering, University of Ulsan)
  • Received : 2021.10.15
  • Accepted : 2021.11.30
  • Published : 2021.11.30
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Abstract

This study analyzes the phase transition behavior and electrical properties of lead-free (1-x)K0.5Na0.5NbO3-xBaZrO3 (KNN-100xBZ) piezoelectric ceramics. The stabilized crystal structures in BaZrO3-modified KNN ceramics is clarified to be pseudocubic. The polymorphic phase transition from the orthorhombic to pseudocubic phases can be observed with KNN-6BZ ceramics considering the optimized piezoelectric constant (d33). Electromechanical strain behaviors are discussed. Accordingly, the enhancement of strain value at x = 0.08 (composition) may originate from the coexistence of ferroelectric domains and polar nanoregions. A schematic of domains for KNN, KNN-8BZ, and KNN-15BZ ceramics has been proposed to describe the relationship between the stabilized relaxor and changes in electrical properties.

Keywords

Acknowledgement

This study was supported by the National Research Foundation (NRF) of the Republic of Korea (Grant Nos. 2020R1C1C1007375 and 2016R1D1A3B01008169). CW Ahn acknowledges financial support from the Basic Science Research Program through the National Research Foundation (NRF) of the Republic of Korea (Grant No. 2021R1I1A1A01057086).

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