eCite Digital Repository

Surface structure of oxygen annealed donor doped SrTiO3(100) single crystals studied with spectroscopic electron microscopy

Citation

Wei, H and Maus-Friedrichs, W and Lilienkamp, G and Kempter, V and Helmbold, J and Goemann, K and Borchardt, G, Surface structure of oxygen annealed donor doped SrTiO3(100) single crystals studied with spectroscopic electron microscopy, Journal of Electroceramics, 8, (3) pp. 221-228. ISSN 1385-3449 (2002) [Refereed Article]

DOI: doi:10.1023/A:1020850101504

Abstract

Heating 5at.% (on A-site) La-doped SrTiO3(100) single crystal in an ambient atmosphere at 1300°C for 120 h results in the formation of insulating islands on top of the surface with typical dimensions of up to 50 μm. The islands and the surface between them were investigated by spectroscopic Metastable Impact Electron Emission Microscopy (specMIEEM) and Photoelectron Emission Microscopy in order to determine its electronic and geometric structure. The comparison of specMIEEM results with MIES (Metastable Impact Electron Spectroscopy) spectra from stoichiometric SrO shows that the insulating islands, which most likely consist of SrO, are at least partly covered by another species, probably SrO2. All these islands are surrounded by 2-3 μm wide haloes. The electronic structure of these haloes is quite different from that of SrO and SrTiO3 but similar to the electronic structure of TiO2 or Ti2O3. It is suggested that the depletion of SrO from Ruddlesden-Popper (Srn+1TinO3n+1) phases results in the formation of SrO islands.

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, K (Dr Karsten Goemann)
ID Code:70175
Year Published:2002
Web of Science® Times Cited:17
Deposited By:Central Science Laboratory
Deposited On:2011-06-06
Last Modified:2011-06-06
Downloads:0

Repository Staff Only: item control page