Growth and characterization of Na0.5Bi0.5TiO3–BaTiO3 lead-free piezoelectric crystal by the TSSG method
- 作者：Wenwei Ge ; Hong Liu ; Xiangyong Zhao ; Xiaoming Pan ; Tianhou He ; Di Lin ; Haiqing Xu ; Haosu Luo
- 关键词：Ferroelectrics ; Crystal growth ; X-ray diffraction ; Dielectric response ; Piezoelectricity
- 刊名：Journal of Alloys and Compounds
- 出版年：2008
- 期刊代码：45_09258388
- 类别：ms
- 出版时间：29 May 2008
- 卷：456
- 期：1-2
- 页码：503-507
- 文件大小：422 K
摘要
In this paper, polycrystalline material of 0.94Na0.5Bi0.5TiO3–0.06BaTiO3 (abbreviated as NBBT94/6) was synthesized by solid-state reaction techniques. DTA and TG analysis indicate the proper temperature for solid-state reaction is 1200 °C. A single crystal with dimensions of 25 mm × 10 mm was successfully grown by using the top-seeded solution growth (TSSG) method. X-ray fluorescence analysis revealed that the composition of the as-grown crystal is NBBT98/2. X-ray powder diffraction results show that the as-grown NBBT98/2 crystal possesses the perovskite structure and belongs to the rhombohedral system. The unit-cell constants of the as-grown NBBT98/2 crystal are a = b = c = 3.8862 Å and 
= β = γ = 89.2°. At room temperature, the dielectric constant of <0 0 1> oriented NBBT98/2 crystal is 770 at 10 kHz and it decreases to 430 after poling under the E-field of 7 kV/mm. Maximum d33 values of 60, 65 and 30 pC/N were obtained for <0 0 1>, <1 1 0> and <1 1 1> oriented NBBT98/2 crystal, respectively.
= β = γ = 89.2°. At room temperature, the dielectric constant of <0 0 1> oriented NBBT98/2 crystal is 770 at 10 kHz and it decreases to 430 after poling under the E-field of 7 kV/mm. Maximum d33 values of 60, 65 and 30 pC/N were obtained for <0 0 1>, <1 1 0> and <1 1 1> oriented NBBT98/2 crystal, respectively.