Property of A/B Sites Substituted Bismuth Sodium Titanate Based Piezoelectrics

doi:10.15541/jim20170398

Abstract

Abstract:

Bi and Co substituted stoichiometric bismuth sodium titanate based lead free piezoelectrics, (Bi_0.5+_x_/2Na_0.5-_x_/2)_0.94Ba_0.06Ti_1-_xCo_xO₃, were prepared by using a solid-state reaction method. The effects of combined A/B sites defects on polarization hysteresis and electric-induced-strain properties of materials were explored. It is shown that single pseudocubic structure is revealed in all samples. Substitution leads to downward shift of the ferroelectric-relaxor transition temperature and increase in strain. Meanwhile, the samples exhibit high strain of 0.458% and inverse piezoelectric coefficient d₃₃^* of 770 pm/V, accompanied by an increased fraction of relaxor phase during fatigue test. The anomalies in temperature dependent dielectrics and hysteresis loops are highly related to the formation of A/B sites defect dipoles which mediated by oxygen vacancies in stoichiometric ceramics.

Key words: bismuth sodium titanate, ferroelectrics, electric-induced-strain, defects

CLC Number:

TM282

LIU Xiao, XU Xiao-Min, DU Hui-Ling. Property of A/B Sites Substituted Bismuth Sodium Titanate Based Piezoelectrics[J]. Journal of Inorganic Materials, 2018, 33(6): 683-687.

Figures/Tables 6

Fig. 1 Surface SEM images of xCo-BNBT ceramics((a)x=0, (b)x=0.5mol%, (c)x=0.75mol%, (d) x=1mol%, (e) x=3mol%, and(f) Change of grain size with Co dopant

Fig. 2 (a) Temperature dependence of dielectric permittivity and dielectric loss of 1mol%Co-BNBT at different frequencies and (b) temperature dependence of relative dielectric permittivity and loss of xCo-BNBT at 1 kHz

Fig. 3 P-E, J-E and S-E loops of xCo-BNBT ceramics under 60 kV/cm electric field at room temperature

Fig. 4 P-E and J-E loops of 1mol%Co-BNBT ceramics under 60 kV/cm electric field at different temperatures

Fig. 5 P-E and J-E loops of 2mol%Co-BNBT ceramics under 60 kV/cm electric field after treatment in air and nitrogen, respectively

Fig. 6 Fatigue strain curves on S-E loops of 1mol%Co-BNBT ceramics at 75℃

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