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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing

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

Eugene Kotomin^1,2, Vladimir Kuzovkov², Anatoli I Popov²

¹Max Planck Institute for Solid State Research , Stuttgart, Germany.

The Journal of Physical Chemistry. A

|December 13, 2017

Summary

This study analyzes F-type color center annealing in irradiated ionic materials. Defect migration energy decreases with radiation fluence, following the Meyer-Neldel rule.

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Area of Science:

Materials Science
Solid State Physics
Radiation Damage

Background:

F-type color centers, such as oxygen vacancies with trapped electrons, are crucial defects in ionic materials.
Understanding their annealing kinetics is vital for predicting material behavior under irradiation.

Purpose of the Study:

To analyze the annealing kinetics of F-type color centers in Al2O3, MgO, and MgF2.
To extract migration energies and diffusion pre-exponential factors of interstitial ions.
To investigate the influence of radiation fluence on defect migration parameters.

Main Methods:

Experimental analysis of annealing kinetics for irradiated ionic materials (Al2O3, MgO, MgF2).
Application of phenomenological theory for diffusion-controlled recombination.
Comparison of experimental data with first-principles calculations.

Main Results:

Migration energy and pre-exponential factor of interstitials decrease with increasing radiation fluence.
This correlation follows the Meyer-Neldel rule, observed in various disordered materials.
The effect is independent of the irradiation type (electrons, neutrons, heavy ions).

Conclusions:

The dependence of defect migration parameters on radiation fluence is significant and cannot be ignored in radiation damage analysis.
The observed Meyer-Neldel rule provides insights into the origin of this fluence dependence.
This research highlights the importance of considering dynamic defect properties in irradiated materials.