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Electrical polarization induced by atomically engineered compositional gradient in complex oxide solid solution
NPG Asia Materials ( IF 9.7 ) Pub Date : 2019-04-12 , DOI: 10.1038/s41427-019-0117-y
Ping-Chun Wu , Rong Huang , Ying-Hui Hsieh , Bo Wang , Min Yen , Sheng-Zhu Ho , Akihito Kumamoto , Chaorong Zhong , Haili Song , Yi-Chun Chen , Long-Qing Chen , Chun-Gang Duan , Yuichi Ikuhara , Ying-Hao Chu

Control of inhomogeneity in materials in order to avoid unexpected effects to the system remains a challenge. In this study, we seek to engineer inhomogeneity in materials and anticipate new properties. Through precise control of composition at the atomic scale, an electrical polarization is induced in the composition-graded LaAlO3–SrTiO3 solid solution epitaxially deposited on NdGaO3 substrates. By tailoring the direction of compositional gradient, the relationship between structure and electrical polarization is simulated via phase-field modeling and revealed by a combination of scanning transmission electron microscopy and scanning probe microscopy. The analysis of the results indicates that the induced polarization is due to the flexoelectric effect in the compositional gradient system. The results of this study provide a new pathway for obtaining a new material genome. Moreover, by a suitable design of the new genome, that is, by using different combinations of compositional gradient geometries, local conduction can be obtained and manipulated, providing a new approach to obtain the desired properties.



中文翻译:

复杂氧化物固溶体中原子工程组成梯度引起的电极化

为了避免对系统的意外影响,控制材料的不均匀性仍然是一个挑战。在这项研究中,我们寻求工程化材料的不均匀性并预测新的性能。通过在原子尺度上精确控制组成,在外延沉积在NdGaO 3上的组成渐变的LaAlO 3 -SrTiO 3固溶体中引起了极化。基材。通过调整组成梯度的方向,通过相场建模模拟了结构与电极化之间的关系,并通过扫描透射电子显微镜和扫描探针显微镜的结合揭示了这种关系。结果分析表明,感应极化是由于组分梯度系统中的柔电效应引起的。这项研究的结果为获得新的材料基因组提供了一条新途径。此外,通过新基因组的适当设计,即通过使用组成梯度几何形状的不同组合,可以获取和操纵局部传导,从而提供一种获得所需特性的新方法。

更新日期:2019-11-18
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