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Anomalous Kinetics of Diffusion-Controlled Defect Annealing in Irradiated Ionic Solids

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Kotomin,  E.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Popov,  A. I.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Maier,  J.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Kotomin, E., Kuzovkov, V., Popov, A. I., Maier, J., & Vila, R. (2018). Anomalous Kinetics of Diffusion-Controlled Defect Annealing in Irradiated Ionic Solids. The Journal of Physical Chemistry A, 122(1), 28-32.


Cite as: https://hdl.handle.net/21.11116/0000-000E-DEFC-D
Abstract
The annealing kinetics of the primary electronic F-type color centers (oxygen vacancies with trapped one or two electrons) is analyzed for three ionic materials (Al2O3, MgO, and MgF2) exposed to intensive irradiation by electrons, neutrons, and heavy swift ions. Phenomenological theory of diffusion-controlled recombination of the F-type centers with much more mobile interstitial ions (complementary hole centers) allows us to extract from experimental data the migration energy of interstitials and pre-exponential factor of diffusion. The obtained migration energies are compared with available first-principles calculations. It is demonstrated that with the increase of radiation fluence both the migration energy and pre-exponent are decreasing in all three materials, irrespective of the type of irradiation. Their correlation satisfies the Meyer-Neldel rule observed earlier in glasses, liquids, and disordered materials. The origin of this effect demonstrates that in the quantitative analysis of the radiation damage of real materials the dependence parameters on the radiation fluence plays an important role and cannot be neglected.