Large Electrostrictive Strain in ( <scp> <scp>Bi</scp> </scp> _0.5 <scp> <scp>Na</scp> </scp> _0.5 ) <scp> <scp>TiO</scp> </scp> ₃ – <scp> <scp>BaTiO</scp> </scp> ₃ –( <scp> <scp>Sr</scp> </scp> _0.7 <scp> <scp>Bi</scp> </scp> _0.2 ) <scp> <scp>TiO</scp> </scp> ₃ Solid Solutions

Abstract

Relaxor ferroelectrics (0.94 − x )( Bi 0.5 Na 0.5 ) TiO 3 –0.06 BaTiO 3− x ( Sr 0.7 Bi 0.2 □ 0.1 ) TiO 3 ( BNT – BT – x SBT ) (0 ≤ x ≤ 0.5), were prepared by a solid‐state reaction process, and their structures were characterized by the transmission electron microscopy and Raman spectroscopy. The BNT – BT –0.3 SBT has a very high electrostrictive strain S = 0.152% with hysteresis‐free behavior, much more than the reported S in other ferroelectrics. S – P 2 profiles perfectly follow the quadratic relation, which indicates a purely electrostrictive effect with a high electrostrictive coefficient ( Q 11 ) of 0.0297 m 4 /C 2 . Even, its Q 11 keeps at a high level in the temperature range from ambient temperature to 180°C. The field‐induced large electrostrictive strain of BNT – BT –0.3 SBT was attributed to the existence of ferroelectric nanodomains.