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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Probing the Electronic Structures of BaTiO3/SrTiO3 Multilayered Film with Spatially Resolved Electron Energy-Loss Spectroscopy
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Probing the Electronic Structures of BaTiO3/SrTiO3 Multilayered Film with Spatially Resolved Electron Energy-Loss Spectroscopy

机译：空间分辨电子能谱分析BaTiO3 / SrTiO3多层膜的电子结构

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摘要

A multilayered film of BaTiO3/SrTiO3 was grown on a LaAlQ(3) substrate using dual-target pulsed laser deposition technique. High-resolution scanning transmission electron microscopy observations show that the nine unit-cell BaTiO3 layer and the three unit-cell SrTiO3 layer are alternatively arranged in the epitaxial film where a sharp interface exists between the BaTiO3 and SrTiO3 layers. Electron energy-loss spectroscopy analysis demonstrates that the O-K edge spectra of SrTiO3 and BaTiO3 layers are quite distinct; in particular, the energy-loss peak at 547 eV in the SrTiO3 spectrum splits into two peaks in the BaTiO3 spectrum. The multiple-scattering calculations of O-K edge spectra for BaTiO3 and SrTiO3 agree well with the experimental results. The low energy region (<542 eV) of the O-K edge spectra for both BaTiO3 and SrTiO3 is mainly caused by the hybridization of the O 2p with Ti 3d orbitals. The splitting peaks between 542 and 552 eV in the O-K edge spectra of BaTiO3 are attributed to its complex crystal structure including two unequal oxygen sites and low site symmetry.
机译：使用双靶脉冲激光沉积技术在LaAlQ（3）衬底上生长BaTiO3 / SrTiO3多层膜。高分辨率扫描透射电子显微镜观察表明，在外延膜中交替排列了九个单位晶格的BaTiO3层和三个单位晶格的SrTiO3层，其中BaTiO3和SrTiO3层之间存在清晰的界面。电子能量损失谱分析表明，SrTiO3和BaTiO3层的O-K边缘谱非常不同。特别是，SrTiO3光谱中547 eV处的能量损失峰分裂为BaTiO3光谱中的两个峰。 BaTiO3和SrTiO3的O-K边缘光谱的多次散射计算与实验结果吻合良好。 BaTiO3和SrTiO3的O-K边缘光谱的低能区域（<542 eV）主要是由O 2p与Ti 3d轨道的杂化引起的。 BaTiO3的O-K边缘光谱中在542和552 eV之间的分裂峰归因于其复杂的晶体结构，包括两个不相等的氧位和低位对称性。

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