Large Electrostrictive Strain in ( Bi 0.5 Na 0.5 ) TiO 3 – BaTiO 3 –( Sr 0.7 Bi 0.2 ) TiO 3 Solid Solutions

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.