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Influence of compositional ratio K/Na on structure and piezoelectric properties in [(Na1−xKx)0.5Bi0.5]Ti0.985Ta0.015O3 ceramics
- Li, Qiang, Wang, Chao, Zhang, Weiming, Fan, Huiqing
- Journal of materials science 2019 v.54 no.6 pp. 4523-4531
- actuators, ceramics, electrical properties, phase transition, potassium, sodium
- [(Na₁₋ₓKₓ)₀.₅Bi₀.₅]Ti₀.₉₈₅Ta₀.₀₁₅O₃ (abbreviated as Ta-NK100x) lead-free ceramics with good piezoelectric properties were prepared using a solid-state reaction method. The structure and electrical properties of Ta-NK100x had been systemically investigated. The highest bipolar strain of 0.458% and the unipolar strain 0.448% are achieved at x = 0.18 at 60 kV/cm. Meanwhile, the corresponding normalized strain [Formula: see text] reaches 747 pm/V. In addition, the unipolar strain of the poled Ta-NK18 increases to 0.537%, and corresponding [Formula: see text] increases slightly to 894.5 pm/V at 60 kV/cm. The electric-field-induced phase transition between ferroelectric and relaxor is found to play a dominant role in the origin of the large strain. Moreover, the strain behavior remains stable within 10⁵ switching cycles which indicating the prepared ceramics are promising candidates for actuators and stress sensors.