Dielectric and piezoelectric properties of (0.97-x) Bi1/2Na1/2TiO3-xBi1/2K1/2TiO3-0.03NaNbO3 ceramics |
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Authors: | Ying Yuan Shuren Zhang Jingsong Liu |
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Affiliation: | (1) School of Microelectronic and Solid-state Electronics, University of Electronic Science and Technology of China, Jianshe Road, Chengdu, 610054, People’s Republic of China |
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Abstract: | Ceramics of the series (0.97-x)Bi1/2Na1/2TiO3-xBi1/2K1/2TiO3-0.03NaNbO3 (x = 0, 0.02, 0.06, 0.10, 0.16, 0.20, 0.30) were prepared by the conventional mixed oxide method. Influence of Bi1/2K1/2TiO3 content on the crystal structure, microstructure, dielectric and piezoelectric properties were studied. All compositions
showed single perovskite phase and the morphotropic phase boundary (MPB) between rhombohedral and tetragonal phase existed
at the point of x = 0.16. Temperature dependences of permittivity and dissipation factor of unpoled samples revealed that permittivity increased
with Bi1/2K1/2TiO3 content and it reached maximum value near the MPB. At the same time, the peak value of dissipation factor increased with
the addition of Bi1/2K1/2TiO3. All the samples experienced two phase transitions: from ferroelectric to antiferroelectric at the first transition temperature
(Td) and from antiferroelectric to paraelectric at the temperature (Tm) corresponding to maximum value of permittivity. The phase transition from ferroelectric to antiferroelectric had relaxor
characteristic and Td shifted to lower temperature while increasing Bi1/2K1/2TiO3 content. The best piezoelectric properties were obtained in 0.81Bi1/2Na1/2TiO3-0.16Bi1/2K1/2TiO3-0.03NaNbO3 ceramic with a piezoelectric constant (d33) of 146pC/N, planar electromechanical coupling factor (kp) of 30.3% and thickness electromechanical coupling factor (kt) of 53.2%. Abnormal piezoelectric properties were observed in the sample (x = 0.20), which was attributed to the co-existence of ferroelectric and antiferroelectric phases in it. |
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