Influence of phase composition on electrostrains of doped (Bi0. 5Na0. 5) TiO3–BaTiO3–(Bi0. 5K0. 5) TiO3 lead-free ferroelectric ceramics
Resource
Smart Materials and Structures, 19(9), 094007
Journal
Smart Materials and Structures
Journal Volume
19
Journal Issue
9
Pages
-
Date Issued
2010
Date
2010
Author(s)
Abstract
The actuating properties such as the electrostrain and piezoelectric charge coefficient d33 of the lead-free 0.854(Bi0.5Na0.5)TiO3–0.026BaTiO3–0.12(Bi0.5K0.5)TiO3 (abbreviated as BNBK 85.4/2.6/12) ferroelectric ceramic upon manganese (Mn) or cobalt (Co) doping are investigated. These dopants are chosen to improve the sinterability and ferroelectric characteristics of BNBK 85.4/2.6/12. Intricate straining behaviors are observed upon Mn doping—an electrostrain of about 0.1% can be maintained when the Mn doping amount is in between 0.5 and 1.5 mol%. Once outside this doping range, the induced electrostrain is considerably smaller. In contrast, for the Co-doped BNBK 85.4/2.6/12 ceramics, the values of electrostrain and d33 stay relatively constant regardless of the Co doping level. By examining the evolution of crystalline phase composition with increasing doping concentration, the mole content of the rhombohedral phase is shown to be a critical factor in deciding the straining behaviors of the doped BNBK 85.4/2.6/12 ceramics. At each increasing step in Mn or Co doping level, there is a marked similarity in the evolution of the induced electrostrain and rhombohedral phase content.
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journal article
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