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Neutron irradiation and post-irradiation annealing of rutile (TiO2−x ): effect on hydrogen incorporation and optical absorption |
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| Authors: | Geoffrey David Bromiley Andrei A Shiryaev |
| Institution: | 1. Bayerisches Geoinstitut, Universit?t Bayreuth, Bayreuth, Germany 2. Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK 3. A.V. Shubnikov Institute of Crystallography RAS, Leninsky Pr. 59, 119333, Moscow, Russia |
| Abstract: | 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. |
| Keywords: | Hydrogen Rutile Spectroscopy Neutron irradiation Radiation defects |
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