Large recoverable electrostrain in Mn-doped (Ba,Sr) TiO3 ceramics
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IEEE
(0) (0 Votes)Views: (2003) Date: (Publication Date: Dec 2004) Pages: () -
Author: Zhang L. X. Chen W. Ren X. Multi-Disciplinary Materials Research Center and State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong University Xi’an 710049 People’s Republic of China and Materials Physics Group National Institute for Materials Science Tsukuba 305-0047 Ibaraki Japan;
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Abstract: Abstract In this letter we demonstrate that with a different principle, BaTiO3 ceramics, so far considered as inferior piezoelectrics compared with Pb(Zr,Ti)O3 (PZT), can show a large recoverable electrostrain. This principle utilizes a point-defect-mediate d reversible domain switching mechanism, which can in theory generate 0.368% strain for BaTiO3 ceramics at the best condition. Experimental results showed that, after aging at room temperature, 1.0 mol % Mn-doped (Ba0.95Sr0.05)TiO3 ceramics generate a large recoverable nonlinear strain of about 0.12%–0.15% at a field of 3 kV/mm. This value exceeds that of conventional hard PZT piezoelectric ceramics. A microscopic model for the domain-related electrostrain effect in ceramics is proposed. It is also found that the large electrostrain effect is quite stable with respect to both changing frequency and fatigue cycles. Large electrostrain remains recoverable down to 0.05 Hz and after 10 000 cycles. These results demonstrate the potential of our approach in achieving large recoverable electrostrain in environmental-friend ly (Pb-free) ceramics.
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