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首页> 外文期刊>Applied Surface Science >Electronic structure and topography of annealed SrTiO3(111) surfaces studied with MIES and STM
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Electronic structure and topography of annealed SrTiO3(111) surfaces studied with MIES and STM

机译：用MIES和STM研究退火的SrTiO3（111）表面的电子结构和形貌

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摘要

Perovskites of ABO(3) type like strontium titanate (SrTiO3) are of great practical concern as materials for oxygen sensors operating at high temperatures. It is well known that the surface layer shows different properties compared to the bulk. Numerous studies exist for the SrTiO3(100) and (110) surfaces which have investigated the changes in the electronic structure and topography as a function of the preparation conditions. They have indicated a rather complex behaviour of the surface and the near surface region of SrTiO3 at elevated temperatures. Up to now, the behaviour of the SrTiO3(111) surfaces under thermal treatment is not sufficiently known. This contribution is intended to work out the relation between alteration of the surface topography with respect to the preparation conditions and the simultaneous changes of the electronic structure. We applied scanning tunneling microscopy (STM) to investigate the surface topography and, additionally, metastable impact electron spectroscopy (MIES) to study the surface electronic structure of reconstructed SrTiO3(111) surfaces. The crystals were heated up to 1000 degrees C under reducing and oxidizing conditions. Both preparation conditions cause strong changes of the surface topography and electronic structure. A microfaceting of the topmost layers is found. (c) 2005 Elsevier B.V. All rights reserved.
机译：作为高温下运行的氧气传感器的材料，像钛酸锶（SrTiO3）这样的ABO（3）型钙钛矿受到广泛的关注。众所周知，表面层与块相比显示出不同的性质。对于SrTiO3（100）和（110）表面，已有大量研究，研究了电子结构和形貌随制备条件的变化。他们表明在高温下SrTiO3的表面和近表面区域的行为相当复杂。到目前为止，还没有充分了解SrTiO3（111）表面在热处理下的行为。该贡献旨在计算出相对于制备条件的表面形貌变化与电子结构的同时变化之间的关系。我们应用扫描隧道显微镜（STM）研究表面形貌，此外，使用亚稳态冲击电子光谱（MIES）研究重建的SrTiO3（111）表面的表面电子结构。在还原和氧化条件下将晶体加热至1000℃。两种制备条件都会引起表面形貌和电子结构的强烈变化。发现最顶层的微刻面。 （c）2005 Elsevier B.V.保留所有权利。

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