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http://dx.doi.org/10.4313/JKEM.2022.35.5.15

Electrical Properties and Phase Transition Behavior of Lead-Free BaTiO3-Modified Bi1/2Na1/2TiO3-SrTiO3 Piezoelectric Ceramics  

Kang, Yubin (School of Materials Science and Engineering, University of Ulsan)
Park, Jae Young (School of Materials Science and Engineering, University of Ulsan)
Devita, Mukhllishah Aisyah (School of Materials Science and Engineering, University of Ulsan)
Duong, Trang An (School of Materials Science and Engineering, University of Ulsan)
Ahn, Chang Won (Department of Physics and Energy Harvest Storage Research Center (EHSRC), University of Ulsan)
Kim, Byeong Woo (Department of Electrical Engineering, University of Ulsan)
Han, Hyoung-Su (School of Materials Science and Engineering, University of Ulsan)
Lee, Jae-Shin (School of Materials Science and Engineering, University of Ulsan)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.35, no.5, 2022 , pp. 516-521 More about this Journal
Abstract
We investigated the microstructure, crystal structure, dielectric, and elecromechanical strain properties of lead-free BaTiO3 (BT)-modified (Bi1/2Na1/2)TiO3-SrTiO3 (BNT-ST) piezoelectric ceramics. Samples were prepared by a conventional ceramic processing route. Temperature dependent dielectric properties confirmed that a phase transition from a nonergodic relaxor to an ergodic relaxor was induced when the BT concentration reached 1.5 mol%, interestingly, where the average grain size reached a maximum value of 4.5 ㎛. At the same time, enhanced electromechanical strain (Smax/Emax = 600 pm/V) was obtained. It is suggested that the induced ferroelectric-relaxor phase transition by the BT modification is responsible for the enhancement of electromechanical strain in 1.5 mol% BT-modified BNT-ST ceramics.
Keywords
Lead titanate; Ferroelectricity/ferroelectric oxides; Piezoelectricity/piezoelectric oxides; Goldschmidt tolerance factor;
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Times Cited By KSCI : 6  (Citation Analysis)
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