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arXiv 1409.4432cond-mat.mtrl-sci
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复合氧化物固溶体中电荷介导晶格畸变的直接观察

Direct observation of charge mediated lattice distortions in complex oxide solid solutions

Xiahan Sang, Everett D. Grimley, Changning Niu, Douglas L. Irving, James M. LeBeau

摘要:

材料的性质敏感地依赖于由局部化学涨落引起的皮米尺度的原子位移。这种成分变化和相应的失真的直接真实空间,高空间分辨率的测量可以提供新的见解在原子尺度上的材料行为。使用像差校正扫描透射电子显微镜结合先进的成像方法,我们观察到原子柱特定的,皮米级位移引起的局部化学在复杂的氧化物固溶体。从密度泛函理论预测的位移被发现与所观察到的实验趋势。进一步分析键合和电荷分布,以澄清负责检测到的结构行为的机制。通过将实验电子显微镜测量扩展到以前无法访问的长度尺度,我们确定了与复杂氧化物结构内的键差相关的原子位移。

英文摘要:

Material properties depend sensitively on picometer scale atomic displacements introduced by local chemical fluctuations. Direct real-space, high spatial-resolution measurements of this compositional variation and corresponding distortion can provide new insights into materials behavior at the atomic scale. Using aberration corrected scanning transmission electron microscopy combined with advanced imaging methods, we observed atom column specific, picometer-scale displacements induced by local chemistry in a complex oxide solid solution. Displacements predicted from density functional theory were found to correlate with the observed experimental trends. Further analysis of bonding and charge distribution were used to clarify the mechanisms responsible for the detected structural behavior. By extending the experimental electron microscopy measurements to previously inaccessible length scales, we identified correlated atomic displacements linked to bond differences within the complex oxide structure.

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