Lead-free BNT-based composite materials: enhanced depolarization temperature and electromechanical behavior

Dalton Transactions : an International Journal of Inorganic Chemistry
Wangfeng BaiZhenguo Ji

Abstract

The development of (Bi0.5Na0.5)TiO3-based solid solutions with both high depolarization temperature Tdand excellent piezoelectric and electromechanical properties for practical application is intractable because improved thermal stability is usually accompanied by a deterioration in piezoelectric and electromechanical performance. Herein, we report a 0-3 type 0.93(Bi0.5Na0.5)TiO3-0.07BaTiO3 : 30 mol%ZnO composite (BNT-7BT : 0.3ZnO), in which the ZnO nanoparticles exist in two forms, to resolve the abovementioned long-standing obstacle. In this composite, Zn ions fill the boundaries of BNT-7BT grains, and residual Zn ions diffuse into the BNT-7BT lattice, as confirmed by XRD, Raman spectroscopy, and microstructure analysis. The BNT-7BT composite ceramics with a 0-3 type connectivity exhibited enhanced frequency-dependent electromechanical properties, fatigue characteristics, and thermal stabilities. More importantly, low poling field-driven large piezoelectric properties were observed for the composite ceramics as compared to the case of the pure BNT-7BT solid solution. A mechanism related to the ZnO-driven phase transition from the rhombohedral to tetragonal phase and built-in electric field to partially compensate the depolari...Continue Reading

References

Apr 7, 2010·Physical Review Letters·Wenfeng Liu, Xiaobing Ren
Feb 7, 2014·Journal of the American Chemical Society·Xiaopeng WangXiangjian Wang
Apr 30, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Wangfeng BaiZhenguo Ji
Jun 24, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Ji ZhangShan-Tao Zhang
Oct 12, 2016·Nature Communications·Yongke YanShashank Priya
Nov 1, 2016·ACS Applied Materials & Interfaces·Xiang LvJianguo Zhu
Nov 3, 2016·ACS Applied Materials & Interfaces·Muhammad Asif RafiqPaula Maria Vilarinho
Feb 25, 2017·Journal of the American Chemical Society·Mao-Hua ZhangJing-Feng Li

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Methods Mentioned

BETA
X-ray
scanning electron microscopy
energy
Raman

Software Mentioned

GSAS

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