Abstract
Lead-free piezoelectric ceramics (Bi0.5Na0.5)0.935Ba0.065Ti1-x(Al0.5Sb0.5)xO3 (BNBT6.5–xAS) were prepared by a conventional solid sintering technique and their structure and electrical properties were systematically investigated. With increasing AS content, BNBT6.5-xAS ceramics underwent a phase transition from ferroelectric to relaxor phase, accompanied with the significant disruption of ferroelectric order. Accordingly, the ferroelectric–relaxor transition temperature TF-R was shifted down to room temperature, and thus a large unipolar strain of 0.46% (at 80kV/cm) corresponding to a large signal d33*of 573pm/V is obtained in 1.5mol% AS-modified samples.
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