Giant electrostrain under low driving field in Bi1/2Na1/2TiO3-SrTiO3 ceramics for actuator applications
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 microstruc...
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Published in | Ceramics international Vol. 42; no. 14; pp. 16153 - 16159 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
01.11.2016
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Subjects | |
Online Access | Get full text |
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Summary: | 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 Smax/Emax>850pm/V with an ultra-low driving field of E≤3kV/mm was achieved in the modified compositions. This performance is comparable to that of the Pb(Zr,Ti)O3-based counterparts and demonstrates the great potential of the current materials in piezoactuator applications. |
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ISSN: | 0272-8842 1873-3956 |
DOI: | 10.1016/j.ceramint.2016.07.133 |