Li Shiyang, Zheng Limei, Cao Wenwu
Condensed Matter Science and Technology Institute, Harbin Institute of Technology , Harbin 150080, China.
Appl Phys Lett. 2014 Jul 7;105(1):012901. doi: 10.1063/1.4886765.
0.72Pb(MgNb)O-0.28PbTiO single crystals poled along [011] have macroscopic orthorhombic 2 symmetry. There are total 17 independent material coefficients for this symmetry so that the determination of self-consistent full matrix data is extremely difficult because many samples are needed and there is a large property variation from sample to sample. To overcome this self-consistency difficulty, we have developed a combined ultrasonic pulse-echo and impedance spectroscopy method, which can extract all coefficients from only one small sample. This method is especially useful for piezoelectric materials whose properties are strongly dependent on geometry and for crystals with only limited size available.
沿[011]极化的0.72Pb(MgNb)O-0.28PbTiO单晶具有宏观正交2对称性。对于这种对称性，共有17个独立的材料系数，因此确定自洽的完整矩阵数据极其困难，因为需要许多样品，而且样品之间的性能差异很大。为了克服这种自洽性困难，我们开发了一种超声脉冲回波和阻抗谱相结合的方法，该方法可以仅从一个小样品中提取所有系数。这种方法对于性能强烈依赖于几何形状的压电材料以及尺寸有限的晶体特别有用。
