Publication Date:
2016-04-06
Description:
By conventional ceramics sintering technique, the lead-free 0.85Bi 0.5 Na 0.5(1− x ) Li 0.5 x TiO 3 -0.11Bi 0.5 K 0.5 TiO 3 -0.04BaTiO 3 ( x =0–0.15) piezoelectric ceramics were obtained and the effects of Li dopant on the piezoelectric, dielectric, and ferroelectric properties were studied. With increasing Li addition, the temperature-dependent permittivity exhibited the normal ferroelectric-to-ergodic relaxor (FE-to-ER) transition temperature ( T FE - ER , abbreviated as T F-R ) decreasing down to room temperature. The increasing Li content also enhanced the diffuseness of the FE-to-ER transition behavior. For composition with x = 0.15, a large unipolar strain of 0.37% ( = S max / E max = 570 pm/V) was achieved under 6.5 kV/mm applied electric field at room temperature. Both unipolar and bipolar strain curves related to the temperature closely, and when the temperature reached the T F-R , the normalized strain achieved a maximum value (e.g., for x = 0.10, = 755 pm/V) owing to the electric-field-induced ER-to-FE state transition.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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