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Electronic structure and topography of annealed SrTiO3(111) surfaces studied with MIES and STM


Goemann, AA and Goemann, K and Frerichs, M and Kempter, V and Borchardt, G and Maus-Friedrichs, W, Electronic structure and topography of annealed SrTiO3(111) surfaces studied with MIES and STM, Applied Surface Science, 252, (1) pp. 196-199. ISSN 0169-4332 (2005) [Refereed Article]

DOI: doi:10.1016/j.apsusc.2005.01.116


Perovskites of ABO3 type like strontium titanate (SrTiO 3) 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(1 0 0) and (1 1 0) 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(1 1 1) 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(1 1 1) surfaces. The crystals were heated up to 1000 °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. © 2005 Elsevier B.V. All rights reserved.

Item Details

Item Type:Refereed Article
Keywords:Strontium titanate; Scanning tunneling microscopy (STM); Metastable impact electron spectroscopy (MIES); Surface reconstruction
Research Division:Physical Sciences
Research Group:Condensed matter physics
Research Field:Surface properties of condensed matter
Objective Division:Manufacturing
Objective Group:Ceramics, glass and industrial mineral products
Objective Field:Ceramics
UTAS Author:Goemann, AA (Dr Anissa Goemann)
UTAS Author:Goemann, K (Dr Karsten Goemann)
ID Code:70163
Year Published:2005
Web of Science® Times Cited:7
Deposited By:Central Science Laboratory
Deposited On:2011-06-06
Last Modified:2011-06-06

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