BiMg1/2Ti1/2O3 (BMT)/NaNbO3 (NN) was introduced into the Bi1/2Na1/2TiO3-SrTiO3 lead-free system to modify its phase structure and electrical properties. The ceramics were prepared by a traditional ceramic processing method. All samples exhibited pure perovskite structure, as well as dense microstructures. The modified compositions underwent a phase transition from a ferroelectric phase to an ergodic relaxor state with increasing BMT/NN content. This transition was identified from the decrease in the ferroelectric-relaxor transition temperature to room temperature. When the composition was located in the vicinity of the critical region, giant electrostrain was obtained owing to the field-induced reversible transition between the relaxor and ferroelectric phases. A schematic phase diagram was constructed based on the measured properties. Excellent actuating performance of s(max)/E-max > 850 pm/V with an ultra-low driving field of E <= 3 kV/mm was achieved in the modified compositions. This performance is comparable to that of the Pb(Zr,Ti)O-3-based counterparts and demonstrates the great potential of the current materials in piezoactuator applications. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
National Nature Science Foundation of China(51402297)
; West Light Foundation of the Chinese Academy of Sciences(A14K001)
; Youth Innovation Promotion Association CAS(2016334)
1.Chinese Acad Sci, Inst Opt & Elect, Chengdu 610209, Peoples R China 2.Chinese Acad Sci, Key Lab Adapt Opt, Chengdu 610209, Peoples R China
Recommended Citation:
Tong, Xing-Ye,Li, Hai-Long,Zhou, Jia-Jun,et al. Giant electrostrain under low driving field in Bi1/2Na1/2TiO3-SrTiO3 ceramics for actuator applications[J]. CERAMICS INTERNATIONAL,2016,42(14):16153-16159.
