Abstract
Lead–free piezoelectric ceramics (1−x)(Bi1/2Na1/2)0.935Ba0.065TiO3−xCaYAlO4 (BNBT6.5−xCYAO) were prepared using a conventional solid sintering technique. The addition of CYAO destroyed the ferroelectric long–range order with the shift of the ferroelectric–relaxor transition temperature TF–R down to room temperature and induced the appearance of ergodic relaxor phase. Thus, it leads to a giant field–induced strain with a peak value of 0.44% at x=0.012.
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