Abstract
The effect of SrZrO3 (SZ) addition on the ferroelectric behavior and piezoelectric properties of Bi0.5(Na0.80K0.20)0.5TiO3 (BNKT20) lead-free piezoceramics were investigated. Results showed that BNKT20–xSZ samples underwent a phase transition from ferroelectric rhombohedral and tetragonal phases to relaxor pseudocubic phase with increasing SZ content, and such transition are accompanied with the significant disruption of ferroelectric order and the shift of the ferroelectric–relaxor transition temperature TF−R down to room temperature. Accordingly, it induced an enhancement of the field-induced strain with a peak at a value of ∼0.39% (at 80 kV/cm, corresponding to a large signal d33∗ of ∼488 pm/V) obtained in 1.5 mol%SZ-modified samples. Temperature dependent measurements of both polarization and strain suggest that the origin of the large strain is due to a reversible field-induced ergodic relaxor to ferroelectric phase transformation. Moreover, an attractive property for application as actuators was obtained in this system, as BNKT20 modified with 1.5 mol%SZ exhibits fatigue-free behavior up to 106 cycles. This exceptionally good fatigue resistance is identified due to the presence of an ergodic relaxor state.
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