Kinetics of oxygen interstitial injection and lattice exchange in rutile TiO{sub 2}

Journal Article · Mon May 12 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4876916· OSTI ID:22273412

Gorai, Prashun; Hollister, Alice G.; Pangan-Okimoto, Kristine

The existence of a facile surface pathway for generation of O interstitials (O{sub i}) in rutile that can facilitate annihilation of O undesirable vacancies has been demonstrated recently. Through isotopic self-diffusion experiments, the present work determines a value of approximately 1.8 eV for the activation energy of O{sub i} injection from TiO{sub 2} (110). The mean path length for O{sub i} diffusion decreases by nearly an order of magnitude upon adsorption of 0.1 monolayer of sulfur. Sulfur apparently inhibits the surface annihilation rate of Ti interstitials, lowering their bulk concentration and the corresponding catalytic effect they seem to exert upon O{sub i} exchange with the lattice.

• OSTI ID: 22273412
• Journal Information: Applied Physics Letters, Vol. 104, Issue 19; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
ANNIHILATION
INTERSTITIALS
RUTILE
SELF-DIFFUSION
TITANIUM OXIDES
VACANCIES