Role of hydrogen and deuterium on the-center formation in MgO
- 15 January 1975
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 11 (2), 881-890
- https://doi.org/10.1103/physrevb.11.881
Abstract
The formation of the center in MgO by ionizing radiation is found to be contingent on the presence of an impurity: hydrogen. The attainable concentration is dependent upon the initial concentration detected by the 3296- infrared absorption band. A similar dependence on the concentration (2445- band) in deuterated crystals is also observed. Photographs illustrate that the density distribution for a given crystal is identical to that for the center in the same crystal. Quenching crystals, as compared with slow cooling, leads to larger or bands and, upon intense electron irradiation, results in larger concentrations. As the concentration is enhanced by electron irradiation, the and concentrations diminish and ultimately vanish at doses of ∼ 1 × e/. Hydrogen-free (or deuterium-free) crystals are immune to -center formation, regardless of thermal treatment. The experimental evidences can be understood on the basis of a formation mechanism which involves the displacement of hydrogen from the site by ionizing radiation. The enhancement of the infrared absorption bands at 3700 and 2723 in certain crystals due to electron irradiation indicates that some of the displaced hydrogen and deuterium ions form Mg and Mg precipitates, respectively.
Keywords
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