Nature of the 6.1-eV band in neutron-irradiatedsingle crystals
- 15 February 1976
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 13 (4), 1735-1740
- https://doi.org/10.1103/physrevb.13.1735
Abstract
The optical absorption band in single-crystal at 6.1 eV associated with atomic-displacement-type damage has been investigated through its relationship with the 3.0-eV hole center whose identity had been previously established. Using lightly-neutron-irradiated [(1-4) × reactor neutrons/] thick crystals to facilitate measurement of the absorption spectra, it was shown that subsequent room-temperature irradiation produced a further enhancement in the 6.1-eV band as well as developing a composite band near 3.0 eV whose intensity bears a linear relationship to that of the 6.1-eV band. Optical bleaching at 410 nm (3 eV) decreases both the and 6.1-eV bands again with a linear relationship which indicates an oscillator-strength ratio of of ∼ 19. Irradiation in the 6.1-eV band likewise causes a decrease in the 410-nm region. These results indicate that (i) the 6.1-eV nm band is due to an electron trapped at some defect termed the center produced by atomic-displacement processes, and (ii) the 6.1-eV band reflects the concentration of trapped holes rather than the concentration of centers. Isochronal annealing causes thermal decay of the 6.1-eV band in the range 300 to 600° C in these reactor-irradiated specimens.
Keywords
This publication has 16 references indexed in Scilit:
- V centers in single crystal Al2O3Solid State Communications, 1975
- Atomic displacement and ionization effects on the optical absorption and structural properties of ion-implanted Al2O3Applied Physics Letters, 1974
- Damage of Single-Crystal Al2O3 by 14-MeV NeutronsJournal of the American Ceramic Society, 1974
- Electron-Spin Resonances in Reactor-Irradiated Aluminum OxidePhysical Review B, 1965
- Color Centers and Radiation-Induced Defects inPhysical Review B, 1961
- Radiation effects in fused silica and α-Al2O3Discussions of the Faraday Society, 1961
- Annealing of the defects and colour centres in unirradiated and in reactor irradiated Al2O3Discussions of the Faraday Society, 1961
- The anisotropy of optical absorption induced in sapphire by neutron and electron irradiationPhilosophical Magazine, 1960
- Threshold Energy for Lattice Displacement in-Physical Review Letters, 1960
- Saturation in the X-Ray Coloration of Corundum Single CrystalsPhysical Review B, 1953