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Island formation on 0.1 at.% La-doped SrTiO3(100) at elevated temperatures under reducing conditions


Goemann, AA and Beuermann, L and Frerichs, M and Kempter, V and Goemann, K and Borchardt, G and Maus-Friedrichs, W, Island formation on 0.1 at.% La-doped SrTiO3(100) at elevated temperatures under reducing conditions, Surface Science, 523, (1-2) pp. 80-88. ISSN 0039-6028 (2003) [Refereed Article]

DOI: doi:10.1016/S0039-6028(02)02402-0


Annealing of 0.1 at.% La-doped SrTiO3(1 0 0) under reducing conditions (pO2 ≤ 10-8 mbar) between 1000 and 1300 °C for 2 h leads to the formation of islands, which coalesce yielding agglomerates with characteristic dimensions of several micrometers after 40 h. Microscopic (scanning electron microscopy, scanning tunneling microscopy) and spectroscopic techniques (metastable impact electron spectroscopy, ultraviolet photoelectron spectroscopy, scanning tunneling spectroscopy, depth profile Auger electron spectroscopy) were used to reveal the reaction mechanism. Under these experimental conditions the sublimation of titanium from the surface takes place. The islands contain only Ti (40 at.%) and O (60 at.%). They show metallic-like behaviour and consist of Ti2O3. The island formation results from the creation of oxygen vacancies on the surfaces followed by a Ti depletion in the surface region up to a depth of about 8 nm. © 2002 Elsevier Science B.V. All rights reserved.

Item Details

Item Type:Refereed Article
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:70172
Year Published:2003
Web of Science® Times Cited:33
Deposited By:Central Science Laboratory
Deposited On:2011-06-06
Last Modified:2011-06-06

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