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Microstructure, nanostructure, and local crystallography in perovskite ferroelectrics and antiferroelectrics

机译:钙钛矿铁电体和反铁电体的微观结构,纳米结构和局部晶体学

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摘要

Selected area and Kikuchi diraction patterns, traditional bright eld and dark eld imaging techniques in electron microscopy as well as high resolution TEM and STEM techniques, together with electron backscattered electron diraction technique have been used to study the domain structures, local crystallography and atomic structures in PZT-based materials. Reliable EBSD mapping of 90 degrees domains in a tetragonal Pb(Zrx; Ti1-x)O3 with x = 0.5 ferroelectric perovskite has been achieved for the rst time, together with reliable automated orientation determination from TEM-Kikuchi patterns. This has been used to assess the local crystallography of domains by determining misorientation angles at 90 degrees domain boundaries and thus local c/a ratios. In most cases, a good agreement is found between local c/a ratios and global measurements by X-ray diraction, but some clear discrepancies have also been found suggesting that real local variations are present, perhaps as a consequence of compositional inhomogeneities. The details of the domain structure of the incommensurate antiferroelectric struc- ture in La-doped zirconium-rich lead zirconate titanate have been revealed in detail for the rst time. The structure is dominated by 60 degrees domain boundaries close to {101} planes of the primitive perovskite cell; and tilts of the perovskite sublattice of about 0.5 degrees are also noted at such boundaries consistent with a small tetragonal distortion of the primitive cell. Within each domain a streaked nanostructure is revealed under weak diraction conditions perpendicular to the long b-axis of the incommensurate supercell, which appears to be a consequence of planar faulting perpendicular to this b-axis. 90 degrees domain boundaries are also observed but are less frequent than 60 degrees boundaries and in con- trast to previous reports, these often have rather curved and irregular boundary planes. The atomic arrangement of these 90 degrees boundaries was studied by aberration corrected HRSTEM. Dierent stackings and periodicities were identied.
机译:选定的区域和菊池方向图,电子显微镜中的传统明场和暗场成像技术以及高分辨率TEM和STEM技术以及电子背散射电子方向技术已被用于研究Al的畴结构,局部晶体学和原子结构。基于PZT的材料。首次实现了x = 0.5铁电钙钛矿的四方Pb(Zrx; Ti1-x)O3中90度畴的可靠EBSD映射,以及从TEM-菊池模式获得的可靠的自动取向确定。通过确定90度畴边界处的取向错误角,从而确定局部c / a比,已用于评估畴的局部晶体学。在大多数情况下,在局部c / a比率与X射线散射的整体测量值之间找到了很好的一致性,但是也发现了一些明显的差异,表明存在实际的局部变化,可能是由于成分不均匀所致。首次详细揭示了掺La的富锆的锆钛酸铅钛酸盐中不相称的反铁电结构的畴结构的细节。该结构由接近原始钙钛矿单元的{101}平面的60度畴边界控制;在与原始单元的小四边形畸变相一致的边界处,钙钛矿亚晶格的倾斜度也约为0.5度。在每个畴中,在垂直于不相称的超级电池的长b轴的弱疏散条件下,会出现条纹状的纳米结构,这似乎是垂直于该b轴的平面断层的结果。也可以观察到90度的边界,但不如60度的边界频繁,并且与以前的报告相反,这些边界通常具有相当弯曲且不规则的边界平面。通过像差校正HRSTEM研究了这些90度边界的原子排列。确定了不同的堆积和周期性。

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    Villaurrutia Arenas Rafael;

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  • 年度 2010
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  • 正文语种 English
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