Preparation and High Temperature Stability of CaxSr1-xBi2Nb2O9 Lead-free Piezoelectric Ceramics

doi:10.15541/jim20150068

Abstract

Abstract:

Ca_xSr_1-_xBi₂Nb₂O₉ (x=0, 0.10, 0.25, 0.40) ceramics were prepared by solid-state reaction method, and their microstructure, electrical and temperature stability properties were systematically investigated. It is found that Ca-doping does not change the phase structure of SrBi₂Nb₂O₉. With increasing Ca²⁺ contents, microstructure of the Ca_xSr_1-_xBi₂Nb₂O₉ceramics changes from sheet to long strips. The remnant polarization (P_r) increases firstly and then decreases, reaching the maximum value at x=0.01, while the coercive field (E_c) decreases gradually. Furthermore, Ca-doping can also improve the Curie temperature, which increases from 450℃ to 672℃ with increase of Ca²⁺ contents. The optimum electrical properties can be obtained at x=0.10 as 2P_r=14.8 μC/cm², d₃₃=22 pC/N and T_c=488℃. In addition, after annealing at 400℃, the piezoelectric constant (d₃₃) of the ceramics remains 20 pC/N, showing good temperature stability for high temperature applications.

Key words: ceramic, Ca2+-doping, CaxSr1-xBi2Nb2O9, electrical properties

CLC Number:

TM282

YAO Zhong-Ran, CHU Rui-Qing, XU Zhi-Jun, HAO Ji-Gong, LI Guo-Rong. Preparation and High Temperature Stability of Ca_xSr_1-_xBi₂Nb₂O₉ Lead-free Piezoelectric Ceramics[J]. Journal of Inorganic Materials, 2015, 30(9): 989-994.

Figures/Tables 6

Fig. 1 XRD patterns of CaxSr1-xBi2Nb2O9 ceramics sintered at 1100℃ for 2 h

Fig. 2 SEM images of the fracture surface microstructure for CaxSr1-xBi2Nb2O9 ceramics sintered at 1100℃ for 2 h

Fig. 3 Temperature dependence and dielectric loss tanδ of dielectric response at 10 kHz for CaxSr1-xBi2Nb2O9 ceramics nset is the relation between Tc and x

Fig. 4 Ferroelectric P-E hysteresis and I-E loops of CaxSr1-xBi2Nb2O9 ceramics (180℃)

Fig. 5 Remnant polarization (Pr) and coercive field (Ec) of CaxSr1-xBi2Nb2O9 ceramics as a function of x

Fig. 6 Relationship between piezoelectric constant (d33) and heat treatment temperature (T) of the CaxSr1-xBi2Nb2O9 ceramics

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Preparation and High Temperature Stability of Ca_xSr_1-_xBi₂Nb₂O₉ Lead-free Piezoelectric Ceramics

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