Microstructure and electrical properties of (0.94-x) Bi0.5Na0.5TiO3 -0.06BaTiO3-xLiNbO3 lead-free piezoelectric ceramics

作者：Zhou Fei^*; Wu Lang; Wu Wen Juan; Teng Yuan Cheng; Li Yu Xiang

来源：Journal of Functional Materials, 2011, 42(2): 241-243+247.

• Coercive field
• Depolarization temperature
• Dielectric constants
• Electrical property
• Ferroelectric property
• Grain size
• Lead-free piezoceramics
• Lead-free piezoelectric ceramic
• Non-polar
• Piezoelectric constant
• Piezoelectric property
• Pure perovskite structure
• Remanent polarization
• Room temperature
• Solid state reaction method
• TiO

(0.94-x)Bi0.5Na0.5TiO3 -0.06BaTiO3-xLiNbO3(BNBT6-xLN, x=0-0.03) lead-free piezoelectric ceramics were prepared by solid state reaction method. The microstructure, ferroelectric, and piezoelectric properties of BNBT6-xLN ceramics was investigated. The X-ray diffraction analysis shows that all of the ceramics have pure perovskite structure. The grain size becomes more identical and the density increases after the incorporation of certain amount of LiNbO3. For the ceramics with x&le0.02, the remanent polarization (Pr) reduces slightly with increasing x. When x>0.02, the polar and non-polar phases may coexist in the ceramics at room temperature, resulting in a sharp decline in the Pr and coercive field (Ec). With increasing x, both the dielectric constant (Εr) and dielectric loss (tan) increase gradually, and the piezoelectric constant (d33) increases initially and then decreases. The ceramics with x=0.02 exhibit the optimum electrical properties: d33=150 pC/N, kp=27%, Pr=34.1 μC/cm2, Ec=28.8 kV/cm. The depolarization temperature Td is shifted toward lower temperatures with increasing x.

• 出版日期2011
• 单位西南大学; 四川大学