https://scholars.lib.ntu.edu.tw/handle/123456789/614656
標題: | Ultrahigh field-induced strain in lead-free ceramics | 作者: | Wu J.; Zhang H.; Huang C.-H.; Tseng C.-W.; Meng N.; Koval V.; Chou Y.-C.; Zhang Z.; Yan H. YI-CHIA CHOU |
關鍵字: | Bismuth compounds; Domain walls; Energy conversion; Environmental protection; Ferroelectricity; Piezoelectric materials; Piezoelectricity; Point defects; Sodium compounds; Sustainable development; Textures; Titanium compounds; Conversion coefficients; Device application; Ferroelectric phase; Field-induced phase transition; Lead-free ferroelectrics; Lead-free piezoelectric materials; Mechanical energies; Structural heterogeneity; Electromechanical devices | 公開日期: | 2020 | 出版社: | Elsevier Ltd | 卷: | 76 | 來源出版物: | Nano Energy | 摘要: | Due to the worldwide concerns of environmental protection and sustainable development, lead-free piezoelectric materials are greatly desired for bridging the electrical energy to the mechanical energy. However, their lower energy conversion coefficient compared to the conventional lead-containing piezoelectric materials significantly limits their device applications. Herein, we introduce a novel strategy to increase the strain of lead-free ferroelectric system via material structure design to create polar nano regions (PNRs) and point defects in the material while retaining the global ferroelectric phase. This added short-range structural heterogeneity in the material will facilitate the field-induced phase transition and reversible domain wall switching to enhance the strain. Following this strategy, we demonstrate an ultrahigh strain induced by an electric field in non-textured lead-free Bi0.5Na0.5TiO3 (BNT)-based ceramics. The strain in unipolar mode (Suni) can reach up to 0.74% at 70 kV/cm, making it the highest value in reported lead-free ceramics so far. This puts forward a good route to design high-performance piezoelectric materials by material structure engineering. It also reveals the promising potential of lead-free piezoelectric materials in practical electromechanical device applications. © 2020 The Authors |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85086828075&doi=10.1016%2fj.nanoen.2020.105037&partnerID=40&md5=07081f5af9b5bea7761225c4d287ecf7 https://scholars.lib.ntu.edu.tw/handle/123456789/614656 |
ISSN: | 22112855 | DOI: | 10.1016/j.nanoen.2020.105037 |
顯示於: | 材料科學與工程學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。