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(Sub)Surface Mobility of Oxygen Vacancies at theTiO2Anatase (101) Surface
Open accessAbstract
Anatase is a metastable polymorph of TiO2. In contrast to the more widely studied TiO2 rutile, O vacancies (V(O)'s) are not stable at the anatase (101) surface. Low-temperature STM shows that surface V(O)'s, created by electron bombardment at 105 K, start migrating to subsurface sites at temperatures ≥200 K. After an initial decrease of the V(O) density, a temperature-dependent dynamic equilibrium is established where V(O)'s move to subsurface sites and back again, as seen in time-lapse STM images. We estimate that activation energies for subsurface migration lie between 0.6 and 1.2 eV; in comparison, density functional theory calculations predict a barrier of ca. 0.75 eV. The wide scatter of the experimental values might be attributed to inhomogeneously distributed subsurface defects in the reduced sample.
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The surface science of titanium dioxide
Diebold, U. (2003) · Surface Science Reports · doi:10.1016/s0167-5729(02)00100-0 · Cited by 7,944
Self-citationNanoionics-based resistive switching memories
Waser, R., & Aono, M. (2007) · Nature Materials · doi:10.1038/nmat2023 · Cited by 4,923
Cited by
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Metadata
- Authors
- Scheiber, P., Fidler, M., Dulub, O., Schmid, M., Diebold, U., Hou, W., Aschauer, U., & Selloni, A.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2012-09-28
- Volume
- 109
- Issue
- 13
- Pages
- 136103-136103
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2074780992
- Cited by
- 210
- References
- 2
- FWCI
- 6.07
- Type
- journal article
- Language
- en
- Open access
- green
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- Scheiber, P., Fidler, M., Dulub, O., Schmid, M., Diebold, U., Hou, W., Aschauer, U., & Selloni, A. (2012). (Sub)Surface Mobility of Oxygen Vacancies at theTiO2Anatase (101) Surface. Physical Review Letters. https://doi.org/10.1103/physrevlett.109.136103
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