Effect of uniaxial stress on ferroelectric behavior of (Bi1/2Na1/2)TiO3-based lead-free piezoelectric ceramics
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- Effect of uniaxial stress on ferroelectric behavior of (Bi1/2Na1/2)TiO3-based lead-free piezoelectric ceramics
- Tan, X.; Aulbach, E.; Jo, Wook; Granzow, T.; Kling, J.; Marsilius, M.; Kleebe, H-J.; Roedel, J.
- Antiferroelectrics; Applied electric field; Electrical polarization; Ferroelastics; Ferroelectric behavior; Ferroelectric domains; Ferroelectric state; General chemicals; Lead-free piezoelectric ceramic; Piezoelectric strain; Pseudocubic structure; Relaxor ferroelectric ceramics; Remanent polarization; Remanent strain; TiO; Transverse strain; Uniaxial stress; Volume change
- Issue Date
- AMER INST PHYSICS
- JOURNAL OF APPLIED PHYSICS, v.106, no.4, pp. -
- Prior studies have shown that a field-induced ferroelectricity in ceramics with general chemical formula (1-x-y) (Bi1/2 Na1/2) TiO3 -x BaTiO3 -y (K0.5 Na0.5) NbO3 and a very low remanent strain can produce very large piezoelectric strains. Here we show that both the longitudinal and transverse strains gradually change with applied electric fields even during the transition from the nonferroelectric to the ferroelectric state, in contrast to known Pb-containing antiferroelectrics. Hence, the volume change and, in turn, the phase transition can be affected using uniaxial compressive stresses, and the effect on ferroelectricity can thus be assessed. It is found that the 0.94 (Bi1/2 Na1/2) TiO3 -0.05 BaTiO3 -0.01 (K0.5 Na0.5) NbO3 ceramic (largely ferroelectric), with a rhombohedral R3c symmetry, displays large ferroelectric domains, significant ferroelastic deformation, and large remanent electrical polarizations even at a 250 MPa compressive stress. In comparison, the 0.91 (Bi1/2 Na1/2) TiO3 -0.07 BaTiO3 -0.02 (K0.5 Na0.5) NbO3 ceramic (largely nonferroelectric) possesses characteristics of a relaxor ferroelectric ceramic, including a pseudocubic structure, limited ferroelastic deformation, and low remanent polarization. The results are discussed with respect of the proposed antiferroelectric nature of the nonferroelectric state.
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