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The effects of CeO2-doping on piezoelectric and dielectric properties of Bi0.5(Na1 − x − yKxLiy)0.5TiO3 piezoelectric ceramics

✍ Scribed by Yunwen Liao; Dingquan Xiao; Dunmin Lin; Jianguo Zhu; Ping Yu; Lang Wu; Xiaoping Wang

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
428 KB
Volume
133
Category
Article
ISSN
0921-5107

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✦ Synopsis

CeO 2 -doped Bi 0.5 (Na 1 -x -y K x Li y ) 0.5 TiO 3 lead-free piezoelectric ceramics were prepared by solid-state reaction processes. X-ray diffraction (XRD) data show that the ceramics possess pure perovskite phase. SEM images indicate that a small amount of CeO 2 affects the microstructure. The electrical properties of Bi 0.5 (Na 0.725 K 0.175 Li 0.1 ) 0.5 TiO 3 ceramics have been greatly improved by doping of certain amount of CeO 2 . The temperature dependence of the dielectric constant and dissipation factor reveals that the transition temperature from ferroelectric to anti-ferroelectric phases (T f ) decreases with the addition of CeO 2 . At room temperature, the ceramics doped with 0.1 wt% CeO 2 show quite good performance with high piezoelectric constant (d 33 = 220 pC/N), high coupling factor (k p = 39.3%,), enhanced dielectric constant (ε r = 897) and low dissipation factor (tan δ = 2.0%) at 1 kHz, which indicates that CeO 2 -doping possesses both effects of increasing the piezoelectric properties and decreasing the dissipation factor of the ceramics.

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