Bi0.48(Na0.84K0.16)0.48Sr0.04(Ti1-xTax)O3 lead-free ceramics with enhanced electric field-induced strain

Publication date: Available online 14 June 2019Source: Journal of Alloys and CompoundsAuthor(s): Chao Wang, Qiang Li, Arun Kumar Yadav, Haijun Peng, Huiqing FanAbstractA series of Bi0.48(Na0.84K0.16)0.48Sr0.04(Ti1-xTax)O3 (abbreviated as NKS-100xTa) lead-free piezoelectric ceramics were fabricated using a traditional solid-state method. The structure and electrical properties of NKS-100xTa were investigated in detail. The composition for x = 0.01 presented an enhanced electric field induced bipolar strain of ∼0.53%, as well as the giant unipolar strain of ∼0.478% corresponding to Smax/Emax ∼682 p.m./V at 70 kV/cm. It is found that the ferroelectric-relaxor transition temperature (TF-R) shifted down to ambient temperature and the remnant polarization (Pr) decreased with the Ta doping. It destroyed the long-range ferroelectric ordering and increased the relaxor characteristic. Therefore, the origin of giant strain was ascribed to the transformation from the ferroelectric phase to relaxor phase under the applied electric field. In addition, the well fatigue properties within 104 cycles indicated that the prepared ceramics offered extendable availability for sensors and actuators.Graphical abstractFig. 5. (a) Unipolar strain curves of the NKS-100xTa measured at 70 kV/cm with 1 Hz frequency. (b) Pr, Pm and d*33 as a function of Ta content.

Source: Journal of Alloys and Compounds - June 16, 2019 Category: Chemistry Source Type: research