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Enhancement of electromechanical properties in lead‒free (1−x)K0.5Na0.5O3–xBaZrO3 piezoceramics

김병우|이재신|한형수|이상섭|즈엉 짱 안|Hoang Thien Khoi Nguyen|안창원
한국센서학회|2021.11|센서학회지 (Journal of Sensor Science and Technology)|제30권 제6호|pp. 408-414

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키워드

Phase transitionRelaxorPiezoceramicsLead-freePNRs
주제분류공학일반

초록

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.

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.

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Phase transitions and electrical properties of (Na0.5K0.5)NbO3-Bi(Sc0.5Fe0.5)O3 lead-free piezoelectric ceramicsAiling Ding, Hongfu Wang청정에너지연구소 · Journal of Ceramic Processing Research2010 · 제11권 제1호Effect of K2CO3 additive on crystallinity and piezoelectric properties of KNNS-BZ-BKH ceramicsKenji Itaka, Lihaowen Zeng, Rabie Benioub청정에너지연구소 · Journal of Ceramic Processing Research2022 · 제23권 제1호High-Electric-Field-Induced strain at a low driving field in lead-free 0.78Bi0.5Na0.5TiO3-0.22SrTiO3 ceramics modified with KNbO3Duc Thang Le, Jeong Ho Cho, Seong Won Kim, Subramanian Sasikumar청정에너지연구소 · Journal of Ceramic Processing Research2025 · 제26권 제5호Effect of Bi2O3 addition on the microstructure and electrical properties of lead-free (Na0.5K0.5)NbO3- Bi(Na0.80K0.20)TiO3 ceramicsChun-Huy Wang청정에너지연구소 · Journal of Ceramic Processing Research2013 · 제14권 제2호Electrical properties of (Na,K)NbO3-BaTiO3 ceramics fabricated by a physicochemical method이승환, 이영희청정에너지연구소 · Journal of Ceramic Processing Research2011 · 제12권 제4호Regulation of BaTiO3 ceramics’ electrical properties by varying Na0.5Bi0.5TiO3 dopantsMingyang Ma, Peng Liu, Ruobing Li, Shuiyun Li, Xiongjie Hu, Yongshang Tian청정에너지연구소 · Journal of Ceramic Processing Research2023 · 제24권 제4호

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