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http://dx.doi.org/10.46670/JSST.2021.30.6.408

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)
Publication Information
Journal of Sensor Science and Technology / v.30, no.6, 2021 , pp. 408-414 More about this Journal
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
Lead-free; Piezoceramics; Relaxor; PNRs; Phase transition;
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