Electron paramagnetic resonance and optical absorption studies of irradiated lithium aluminate
- 1 February 1988
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine Part B
- Vol. 57 (2) , 137-148
- https://doi.org/10.1080/13642818808201610
Abstract
Using electron paramagnetic resonance(EPR) and optical absorption measurements, defect creation is studied in irradiated single crystals of lithium aluminate, γ-LiAlO2. The EPR observations show the presence of several paramagnetic defects in γ-LiAlO2 irradiated with 2.5 MeV electrons at 20 K and X-rays at room temperature. The major defect includes an electron trapped near an aluminium nucleus. Optical absorption measurements show four bands in the spectra of γ-LiAlO2 irradiated with 2.5 MeV electrons at 20 K and with 2 MeV He+ ions at room temperature and 77 K. By analogy with other oxides, the most intense band (at 5.25 eV) may be assigned to F+-centres. With that assumption, a configuration is proposed for the F+-centre consistent with the EPR observations.Keywords
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