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

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‚ÄČeV 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.
Authors:
; ; ;  [1]
  1. Department of Chemical and Biomolecular Engineering, University of Illinois, Urbana, Illinois 61801 (United States)
Publication Date:
OSTI Identifier:
22273412
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 19; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ACTIVATION ENERGY; ANNIHILATION; INTERSTITIALS; RUTILE; SELF-DIFFUSION; TITANIUM OXIDES; VACANCIES