Piezoelectric, ferroelectric and dielectric properties of Sm2O3-doped (Bi0.5Na0.5)0.94Ba0.06TiO3 lead-free ceramics
Piezoelectric, ferroelectric and dielectric properties of Sm2O3-doped (Bi0.5Na0.5)0.94Ba0.06TiO3 lead-free ceramics
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DOI：
10.1016/j.matchemphys.2010.08.033
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发表时间：
2010-02
影响因子：
4.6
通讯作者：
Peng Fu;Zhijun Xu;R. Chu;Wei Li;G. Zang;J. Hao
中科院分区：
文献类型：
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作者：
Peng Fu;Zhijun Xu;R. Chu;Wei Li;G. Zang;J. Hao
采用传统固相法制备了Sm_2O_3(0-0.7wt.%)掺杂(Bi0.5Na0.5)0.94Ba0.06TiO_3(简称BNBT_6)无铅压电陶瓷。研究了Sm_2O_3对材料微观结构、介电性能和压电性能的影响。X射线衍射图表明，0.1-0.7wt%的Sm2O3弥散进入BNBT6陶瓷的晶格中，形成纯的钙钛矿相。扫描电子显微镜照片表明，少量的Sm2O_3能明显影响合金的显微组织。相对介电常数随温度的变化关系表明，居里点随Sm2O_3含量的增加而降低。在室温下，掺杂0.3wt%Sm_2O_3的陶瓷具有良好的压电性能(压电常数d33为202pCN−1，平面耦合系数kpof为0.30，机械品质因数Qmof101)和介电性能(相对介电常数ɛrof为2018年，损耗因数tanδ为0.056)。此外，所有的BNBT6-−-x(wt.%)Sm_2O_3陶瓷都表现出典型的弛豫行为，具有弥散相变特征，并且随着Sm_2O_3含量的增加，铁电驰豫行为的程度增强。
Sm2O3(0–0.7wt.%)-doped (Bi0.5Na0.5)0.94Ba0.06TiO3(abbreviated as BNBT6) lead-free piezoelectric ceramics were synthesized by conventional solid-state processes. The effects of Sm2O3on the microstructure, dielectric properties and piezoelectric properties were investigated. X-ray diffraction (XRD) patterns show that 0.1–0.7wt.% of Sm2O3can diffuse into the lattice of BNBT6 ceramics forming pure perovskite phase. The SEM images indicate that the microstructure can be affected obviously by a small amount of added Sm2O3. The temperature dependence of the relative dielectric constant shows that Curie point decreases with the increase of Sm2O3. At room temperature, the ceramics doped with 0.3wt.% Sm2O3show quite good performance with excellent piezoelectric properties (piezoelectric constant d33of 202pCN−1, planar coupling factor kpof 0.30 and mechanical quality factor Qmof 101) and improved dielectric properties (relative dielectric constant ɛrof 2018 and dissipation factor tanδ of 0.056). Moreover, all BNBT6−x (wt.%) Sm2O3ceramics exhibit a typical relaxor behavior with diffuse phase transition characteristics and the degree of ferroelectric relaxation behavior is enhanced with the increase of Sm2O3content.