| AVS 57th International Symposium & Exhibition | |
| Surface Science | Thursday Sessions |
| Session SS-ThM |
| Session: | Adsorption and Reactivity on Oxide Surfaces |
| Presenter: | L. Kraya, The University of Pennsylvania |
| Authors: | L. Kraya, The University of Pennsylvania D.A. Bonnell, The University of Pennsylvania |
| Correspondent: | Click to Email |
The functionality of ferroelectric compounds are inspiring new approaches for catalysis, water splitting, information storage, and nanofabrication. The atomic details of interactions at ferreoelectric surfaces are as important as those on other oxides but have been less ammenable to examinaion. Recently we have determined the thermodynamic stability of a wide range of reconstructions on BaTiO3 (100) and also demonstrated that surface reactions depend on the orientation of the ferroelectric polarization. Here we examine the 3x1 and R5xR5 reconstruction in atomic detail. Reaction of the R5xR5 structure with CO2 is imaged by scanning tunneling microscopy as a function of exposure and the site occupation quantified. In addition, the effect of locally reorienting the ferroelectric polarization with an STM tip is determine by scanning tunneling spectroscopy. Offsets in local I/V curves are related to energy level shifts due to the local field induced by the polarization.
These results will be contrasted with those on non ferroelectric oxides.