Enhanced thermal stability of piezoelectricity in lead-free (Ba,Ca)(Ti,Zr)O-3 systems through tailoring phase transition behavior
Enhanced thermal stability of piezoelectricity in lead-free (Ba,Ca)(Ti,Zr)O-3 systems through tailoring phase transition behavior
复制标题
通过调整相变行为增强无铅 (Ba,Ca)(Ti,Zr)O-3 系统中压电的热稳定性
DOI：
10.1016/j.ceramint.2019.02.085
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发表时间：
2019
影响因子：
5.2
通讯作者：
Ren Xiaobing
中科院分区：
文献类型：
--
作者：
Yin Mengye;Zhou Chao;Ren Shuai;Hao Yanshuang;Fang Minxia;Wang Wenjia;Gao Jinghui;Ma Tianyu;Zhang Lixue;Yanga Sen;Ren Xiaobing
良好的热稳定性是无铅钛酸钡陶瓷在室温以上应用的重要条件。在这项研究中，无铅（Ba，Ca）（Ti，Zr）O3陶瓷的热稳定压电性提高，通过定制其相变行为。通过对（1-x）Ba（Ti0.8Zr0.2）O3-x（Ba0.65Ca0.35）TiO 3和（1-y）Ba（Ti0.8Zr0.2）O3-y（Ba0.95Ca0.05）TiO 3的比较，发现后者在aty= 0.80时的热稳定压电系数远高于前者在x = 0.45时的热稳定压电系数。这两个系统在室温下结晶在四方晶系的正交相界。相变温度和扩散程度受Ca和Zr离子含量的调节，并表现出对温度依赖的介电常数，磁滞回线，和in-situ畴结构有很大的影响。（1-y）Ba（Ti0.8Zr0.2）O3-y（Ba0.95Ca0.05）TiO 3（aty= 0.80）热稳定性的提高与其较高的顺电-铁电相变温度（Tm= 115.7 °C）和较小的扩散度（扩散度常数γ= 1.35）有关。当x = 0.45时，（1-x）Ba（Ti0.8Zr0.2）O3-x（Ba0.65Ca0.35）TiO 3的Tm = 81.3 °C，γ= 1.65。总之，这些研究结果对未来的相变行为的模拟和具有良好的热稳定性的压电材料的设计是有希望的。
Good thermal stability in lead-free BaTiO3ceramics is important for their applications above room temperature. In this study, thermal stable piezoelectricity in lead-free (Ba,Ca)(Ti,Zr)O3ceramics was enhanced by tailoring their phase transition behaviors. Comparison between (1-x)Ba(Ti0.8Zr0.2)O3-x(Ba0.65Ca0.35)TiO3and (1-y)Ba(Ti0.8Zr0.2)O3-y(Ba0.95Ca0.05)TiO3revealed that latter system aty= 0.80 had much better thermal stable piezoelectric coefficient than the former atx= 0.45. Both systems crystalized in tetragonal to orthorhombic phase boundary at room temperature. The phase transition temperature and degree of diffusion were adjusted by Ca and Zr ions contents and demonstrated great influence on temperature dependent dielectric permittivity, hysteresis loops, andin-situdomain structures. The improved thermal stability of (1-y)Ba(Ti0.8Zr0.2)O3-y(Ba0.95Ca0.05)TiO3prepared aty= 0.80 was linked to its higher paraelectric to ferroelectric phase transition temperature (Tm= 115.7 °C) and less degree of diffusion (degree of diffusion constantγ= 1.35). By comparison, (1-x)Ba(Ti0.8Zr0.2)O3-x(Ba0.65Ca0.35)TiO3prepared atx= 0.45 revealedTm= 81.3 °C andγ= 1.65. Overall, these findings look promising for future stimulation of phase transition behaviors and design of piezoelectric materials with good thermal stabilities.