Kinetics of F center annealing and colloid formation in Al2O3

E. A. Kotomin; V. N. Kuzovkov; A. I. Popov; R. Vila

doi:10.1016/j.nimb.2015.08.055

Kinetics of F center annealing and colloid formation in Al₂O₃

E. A. Kotomin^*
, V. N. Kuzovkov
, A. I. Popov
, R. Vila

^*Corresponding author for this work

Laboratory of Kinetics in Self-Organizing Systems, Institute of Solid State Physics

CIEMAT

Research output: Contribution to journal › Article › peer-review

57 Citations (Scopus)

Abstract

The diffusion-controlled kinetics of the F center annealing in Al₂O₃ (sapphire, corundum) is simulated theoretically for the two regimes: after neutron irradiation when the immobile F centers are annihilated with complementary defects - mobile interstitial oxygen ions, and in thermochemically reduced (additively colored) crystals where mobile F centers aggregate and create the metal colloids. A comparison of the experimental and theoretical kinetics allowed us to estimate the migration energies for the F centers and interstitial oxygen ions. It is obtained that the pre-exponents in diffusion coefficients for defects in different neutron irradiated samples can vary by two orders of magnitude which is attributed by presence of numerous traps for mobile interstitial oxygen ions.

Original language	English
Pages (from-to)	107-110
Number of pages	4
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	374
DOIs	https://doi.org/10.1016/j.nimb.2015.08.055
Publication status	Published - 1 May 2016

Keywords

Annealing
F centers
Metal colloids
Sapphire (AlO)
Thermochemical reduction

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10.1016/j.nimb.2015.08.055

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title = "Kinetics of F center annealing and colloid formation in Al2O3",

abstract = "The diffusion-controlled kinetics of the F center annealing in Al2O3 (sapphire, corundum) is simulated theoretically for the two regimes: after neutron irradiation when the immobile F centers are annihilated with complementary defects - mobile interstitial oxygen ions, and in thermochemically reduced (additively colored) crystals where mobile F centers aggregate and create the metal colloids. A comparison of the experimental and theoretical kinetics allowed us to estimate the migration energies for the F centers and interstitial oxygen ions. It is obtained that the pre-exponents in diffusion coefficients for defects in different neutron irradiated samples can vary by two orders of magnitude which is attributed by presence of numerous traps for mobile interstitial oxygen ions.",

keywords = "Annealing, F centers, Metal colloids, Sapphire (AlO), Thermochemical reduction",

author = "Kotomin, \{E. A.\} and Kuzovkov, \{V. N.\} and Popov, \{A. I.\} and R. Vila",

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TY - JOUR

T1 - Kinetics of F center annealing and colloid formation in Al2O3

AU - Kotomin, E. A.

AU - Kuzovkov, V. N.

AU - Popov, A. I.

AU - Vila, R.

PY - 2016/5/1

Y1 - 2016/5/1

N2 - The diffusion-controlled kinetics of the F center annealing in Al2O3 (sapphire, corundum) is simulated theoretically for the two regimes: after neutron irradiation when the immobile F centers are annihilated with complementary defects - mobile interstitial oxygen ions, and in thermochemically reduced (additively colored) crystals where mobile F centers aggregate and create the metal colloids. A comparison of the experimental and theoretical kinetics allowed us to estimate the migration energies for the F centers and interstitial oxygen ions. It is obtained that the pre-exponents in diffusion coefficients for defects in different neutron irradiated samples can vary by two orders of magnitude which is attributed by presence of numerous traps for mobile interstitial oxygen ions.

AB - The diffusion-controlled kinetics of the F center annealing in Al2O3 (sapphire, corundum) is simulated theoretically for the two regimes: after neutron irradiation when the immobile F centers are annihilated with complementary defects - mobile interstitial oxygen ions, and in thermochemically reduced (additively colored) crystals where mobile F centers aggregate and create the metal colloids. A comparison of the experimental and theoretical kinetics allowed us to estimate the migration energies for the F centers and interstitial oxygen ions. It is obtained that the pre-exponents in diffusion coefficients for defects in different neutron irradiated samples can vary by two orders of magnitude which is attributed by presence of numerous traps for mobile interstitial oxygen ions.

KW - Annealing

KW - F centers

KW - Metal colloids

KW - Sapphire (AlO)

KW - Thermochemical reduction

UR - https://www.scopus.com/pages/publications/84940933304

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DO - 10.1016/j.nimb.2015.08.055

M3 - Article

AN - SCOPUS:84940933304

SN - 0168-583X

VL - 374

SP - 107

EP - 110

JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

ER -

Kinetics of F center annealing and colloid formation in Al₂O₃

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Keywords

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