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

journal contribution
posted on 2023-05-17, 06:20 authored by Anissa GoemannAnissa Goemann, Beuermann, L, Frerichs, M, Kempter, V, Karsten GoemannKarsten Goemann, Borchardt, G, Maus-Friedrichs, W
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.

History

Publication title

Surface Science

Volume

523

Issue

1-2

Pagination

80-88

ISSN

0039-6028

Department/School

School of Natural Sciences

Publisher

Elsevier

Place of publication

Amsterdam, Netherlands

Repository Status

  • Restricted

Socio-economic Objectives

Ceramics

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