Large Strain Response and Fatigue‐Resistant Behavior in Ternary Bi 0.5 Na 0.5 TiO 3 –BaTiO 3 –Bi(Zn 0.5 Ti 0.5 )O 3 Solid Solutions

A ternary solid solution (1 − x )(0.88 Bi 0.5 Na 0.5 TiO 3 –0.12 BaTiO 3 )‐ x Bi ( Zn 0.5 Ti 0.5 ) O 3 ( BNBZT , BNBZT x ) was designed and fabricated using the traditional solid‐state reaction method. The temperature and composition dependence of dielectric, ferroelectric, piezoelectric, and fatigue properties were systematically investigated and a schematic phase diagram was proposed. The substitution with Bi ( Zn 0.5 Ti 0.5 ) O 3 was found to shift the phase transition (ferroelectric tetragonal to relaxor pseudocubic phase) to lower temperatures. At a critical composition x of 0.05, large electric‐field‐induced strain response with normalized strain S max /E max as high as 526 pm/V was obtained under a moderate field of 4 kV/mm around room temperature. The strain exhibited good temperature stability within the temperature range of 25°C–120°C. In addition, excellent fatigue‐resistant behavior was observed in the proposed BNBZT solid solution after 10 6 bipolar cycles. These give the BNBZT system great potential as environmental friendly solid‐state actuator.