Domain Structure of Poled (K0.50Na0.50)1−xLixNbO3 Ceramics with Different Stabilities
Domain Structure of Poled (K0.50Na0.50)1−xLixNbO3 Ceramics with Different Stabilities
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DOI：
10.1111/jace.13358
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发表时间：
2015-03
影响因子：
3.9
通讯作者：
Jialiang Zhang;Xing-Hua Tian;Yong Gao;W. Yao;Yalin Qin;W. Su
中科院分区：
文献类型：
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作者：
Jialiang Zhang;Xing-Hua Tian;Yong Gao;W. Yao;Yalin Qin;W. Su
采用酸蚀技术观察了几种极化（K0.50Na0.50）1−xLixNbO3陶瓷（化学成分分别为x = 0.03，0.065和0.08）的畴结构。在室温下，x = 0.03的陶瓷为正交相，另外两种为四方相。结果发现，这些陶瓷具有明显不同的功能域图案和压电性能的时效稳定性显示出很大的差异。对于x = 0.03的陶瓷，磁畴图案由多晶晶粒内的一组或几组平行条纹组成。相反，对于x = 0.065或0.08的那些，另外观察到人字形图案和大量水印。此外，x = 0.03的陶瓷被证实具有更好的压电性能的时间老化稳定性比其他两个。结果表明，正交相的电畴结构比四方相的电畴结构稳定。
Domain structure of several poled (K0.50Na0.50)1−xLixNbO3 ceramics (with chemical compositions of x = 0.03, 0.065, and 0.08, respectively) was investigated by means of observing the domain patterns with an acid-etching technique. Among the three ceramics, the one with x = 0.03 is of orthorhombic phase and the other two are of tetragonal phase at room temperature. It was found that these ceramics possess distinctly different features of domain patterns and show a large difference in the time-aging stability of piezoelectric properties. For the ceramic with x = 0.03, domain patterns consist of simply one single set or a few sets of parallel stripes inside the polycrystalline grains. In contrast, for those with x = 0.065 or 0.08, herringbone-type patterns and a large number of watermarks are additionally observed. Furthermore, the ceramic with x = 0.03 was confirmed to have a much better time-aging stability of piezoelectric properties than the other two. The results indicate that domain structure is more stable in orthorhombic phase than in tetragonal phase.