Thermoluminescent Formation of Cr2+ in Magnesium Oxide
- 1 September 1965
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 36 (9) , 2959-2961
- https://doi.org/10.1063/1.1714614
Abstract
In undoped crystals of MgO, x irradiation converts a large fraction of Cr3+ in octahedral symmetry to Cr2+. Heating such crystals until a blue thermoluminescence has been observed causes further reduction. Usually 95% or more of the Cr3+ is converted by the combined treatments. However, in Cr‐doped MgO one is able to reduce only a small fraction of the octahedral chromium to Cr2+. The Cr2+ is reconverted to Cr3+ by heating. ESR measurements show that in the same temperature interval nearly all of the Fe1+ formed on x irradiation has disappeared. The source of electrons acquired by Cr3+ thus appears to be the Fe1+ ions. The thermoluminescence is ascribed to the Cr3+‐electron interaction, as suggested by Hansler and Segelken.This publication has 5 references indexed in Scilit:
- Electron Spin Resonance Studies of Impurity Ions in Magnesium OxideProceedings of the Physical Society, 1961
- Correlation of thermoluminescence in MgO and valence changes of iron and chromium impurities detected by EPRJournal of Physics and Chemistry of Solids, 1960
- Some Weak Lines in the Paramagnetic Resonance Spectrum of Impure MgO CrystalsProceedings of the Physical Society, 1959
- III. Spin resonance studies of defects in magnesium oxideDiscussions of the Faraday Society, 1959
- Crystal Vacancy Evidence from Electron Spin ResonancePhysical Review B, 1957