Estimation of strain from piezoelectric effect and domain switching in morphotropic PZT by combined analysis of macroscopic strain measurements and synchrotron X-ray data
Estimation of strain from piezoelectric effect and domain switching in morphotropic PZT by combined analysis of macroscopic strain measurements and synchrotron X-ray data
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DOI：
10.1016/j.actamat.2006.10.046
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发表时间：
2007-04
期刊：
影响因子：
9.4
通讯作者：
H. Kungl;R. Theissmann;M. Knapp;C. Baehtz;H. Fuess,;S. Wagner;T. Fett;Michael J. Hoffmann
中科院分区：
文献类型：
--
作者：
H. Kungl;R. Theissmann;M. Knapp;C. Baehtz;H. Fuess,;S. Wagner;T. Fett;Michael J. Hoffmann
准同型PZT陶瓷是铁电驱动器的最新材料。这些材料的基本性能参数是应变和滞后。在微观尺度上，由电场提供的应变是由于两种不同的机制。压电效应导致的单位细胞的伸长，而域切换改变它们的结晶取向对齐的极化轴朝向场的方向。提出了一种结合宏观应变测量和X射线衍射（XRD）数据来估计这两种机制对总应变的贡献的方法。从宏观测量的recrystals和单极应变与相应的数据，来自原位同步辐射XRD图案的纹理，结果进行了分析和评价的半经验的方法。该方法被施加到六个morphotropic，LaSr掺杂PZT材料的不同Zr/Ti比。结果进行了讨论的材料之间的差异。
Morphotropic PZT ceramics are the state of the art materials for ferroelectric actuators. Essential performance parameters for these materials are strain and hysteresis. On a microscopic scale the strain provided by an electric field is due to two different mechanisms. The piezoelectric effect causes an elongation of the unit cells, whereas domain switching changes their crystallographic orientation by aligning the polarization axis towards the field direction. A method is outlined to estimate the contribution of the two mechanisms to total strain by combining macroscopic strain measurements and X-ray diffraction (XRD) data. Results from macroscopic measurements of remanent and unipolar strain with the corresponding data on texture, derived from in situ synchrotron radiation XRD patterns, are analyzed and evaluated by a semi-empirical approach. The method was applied to six morphotropic, LaSr doped PZT materials of different Zr/Ti ratios. Results are discussed with respect to the differences between the materials.