Neutron irradiation and post-irradiation annealing of rutile (TiO2−x ): effect on hydrogen incorporation and optical absorption

Neutron irradiation and post-irradiation annealing under oxidising and reducing conditions have been used to investigate H incorporation in, and the optical properties of, reduced (TiO2−x) rutile. Optical absorption in rutile is mainly due to a Ti3+ Ti4+ intervalence charge transfer effect. The main...

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Bibliographic Details
Published in:Physics and chemistry of minerals 2006-09, Vol.33 (6), p.426-434
Main Authors: Bromiley, Geoffrey David, Shiryaev, Andrei A.
Format: Article
Language:English
Subjects:
Absorption
Absorption spectra
Annealing
Charge transfer
Defects
Diffusion rate
Electrical properties
Incorporation
Infrared spectroscopy
Irradiation
Neutron irradiation
Neutrons
Optical properties
Rutile
Titanium dioxide
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Summary:Neutron irradiation and post-irradiation annealing under oxidising and reducing conditions have been used to investigate H incorporation in, and the optical properties of, reduced (TiO2−x) rutile. Optical absorption in rutile is mainly due to a Ti3+ Ti4+ intervalence charge transfer effect. The main mechanism for H incorporation in rutile involves interstitial H not coupled to other defects, which has important implications for the rate of H diffusion, and possibly also on the electrical properties of rutile. Additional minor OH absorption bands in IR spectra indicate that a small amount of interstitial H is coupled to defects such as Ti3+ on the main octahedral site, and indicates that more than one H incorporation mechanism may operate. Concentration of oxygen vacancies has a controlling influence on the H affinity of rutile.
ISSN:0342-1791
1432-2021
DOI:10.1007/s00269-006-0087-9