Predicting the interfacial properties of the perovskite oxide SrTiO3

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• Roger A. De Souza (RWTH Aachen University)
• Monday 07 March 2011, 16:00-17:00
• T001, Department of Materials Science and Metallurgy.

If you have a question about this talk, please contact Ian Farnan.

Joint with Materials Sciences

There is renewed interest in the properties of hetero- and homophase boundaries in the perovskite oxide SrTiO3 because of this material’s possible application in all-oxide electronics, as a high-k dielectric, and in resistive-switching devices. In this talk I focus on the interplay between point defects and interfaces (grain boundaries and surfaces) in acceptor-doped SrTiO3. Experimental results obtained for various symmetrical low-angle [001] tilt grain boundaries are presented. The results are examined within a thermodynamic framework that allows the properties of grain boundaries in acceptor-doped SrTiO3 to be predicted. The aim is to derive relationships between the crystallographic structure of an interface and its transport properties. The second part of the talk concerns non-uniform defect distributions at the (100) surface of SrTiO3. A method for probing such non-uniform defect distributions will be presented, together with experimental data obtained for single crystal substrates. The origins of the non-uniform defect distributions will also be discussed. Lastly, the implications of results for SrTiO3-based oxide heterostructures are examined.

This talk is part of the Mineral Sciences Seminars series.

This talk is included in these lists:

• Department of Earth Sciences seminars
• Mineral Sciences Seminars
• T001, Department of Materials Science and Metallurgy

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