The Piezoelectric Failure of the CeO₂-Doped (Ca,Sr)Bi₄Ti₄O₁₅ Ceramics at High Temperature

Abstract

The CeO₂-doped bismuth-layered structural (Ca,Sr)Bi₄Ti₄O₁₅ ceramics, one of the most attractive materials with high Curie temperature were prepared by the solid state reaction method. The crystal structure of the ceramics was determined by X-ray diffraction. The doping of CeO₂ increased the lattice parameters a, b, c and crystal volume, though the single orthorhombic structure phase was still remained. The effect on the content of the Ce ions to the dielectric properties of the ceramics were also investigated, such as the hysteresis loops, dielectric constants, Curie temperature (T_C) and so on. The piezoelectric failure at the temperature much lower than the Curie temperature was found. The mechanism of the Ce ions doping and failure were also analyzed.

Keywords:

• Piezoelectric properties
• failure
• (Ca,Sr)Bi₄Ti₄O₁₅
• defects

Acknowledgments

The author would like to acknowledge the finance support of the National Natural Science Foundation of China (10876041, 50675218, 50702068) and Basic Research and Development Program of China (973 Program), No. 2009CB623305.