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Bipolar Electric Field Induced Strain in Li Substituted Lead-Free Bi0.5(Na0.82K0.18)0.5Ti0.95Sn0.05O3 Piezoelectric Ceramics

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We have fabricated environmental friendly lead-free Bi0.5(Na0.82K0.18)0.5TiO3 (BNKT) and Bi0.5(Na(0.82−x)Li x K0.18)0.5(Ti0.95Sn0.05)O3 piezoelectric ceramics (BNKTS-xLi) with x ranging from 0 to 0.05 by the conventional solid state reaction method. The effects of Li substitution were studied through the crystal structures and the piezoelectric properties. The X-ray diffraction data showed that BNKTS-xLi ceramics experienced a phase transition from the pseudocubic phase to the rhombohedral and tetragonal symmetry when the Li doping content increased. The typical butterfly-shaped bipolar S-E loops of piezoelectric materials were observed in all compositions. The small amount of Li substitution for BNKTS-xLi ceramics led to a marked enhancement in piezoelectric properties, with the electric field-induced strain (S max/E max) reaching the highest value of 590 pm/V at x = 0.04. The BNKTS-xLi ceramics will be excellent candidates for applications in lead-free ferroelectric and piezoelectric devices.
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Keywords: Ceramic; Ferroelectric; Lead-Free; Piezoelectric; Strain

Document Type: Research Article

Affiliations: 1: School of Engineering Physics, Ha Noi University of Science and Technology, 1 Dai Co Viet road, Ha Noi, 100000, Viet Nam 2: International Institute for Materials Science, Ha Noi University of Science and Technology, 1 Dai Co Viet road, Ha Noi, 100000, Viet Nam 3: Department of Physics, University of Ulsan, Nam Gu Ulsan, Ulsan 680-749, South Korea

Publication date: 2016-08-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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