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RESEARCH PRODUCT
LiF crystals irradiated with 150MeV Kr ions: Peculiarities of color center creation and thermal annealing
Alma DauletbekovaK. SchwartzA RusakovaM.v. SorokinJanis ManiksMaxim V. ZdorovetsM. V. KoloberdinAbdirash Akilbekovsubject
Nuclear and High Energy PhysicsColloidRange (particle radiation)Absorption spectroscopyAnnealing (metallurgy)ChemistryIon trackAnalytical chemistryIrradiationAtomic physicsInstrumentationFluenceIondescription
Abstract Color centers in LiF crystals are studied under irradiation at room temperature with 150 MeV Kr ions in the fluence (Φ) range of 1010–1014 ions/cm2 with a beam current density of 10, 50, and 100 nA/cm2, corresponding to flux of 4.46 × 109, 2.23 × 1010 and 4.46 × 1010 ions/(cm2 × s), respectively. At Φ ⩾ 3 × 1012 ions/cm2 besides F and Fn centers also charged F 3 + centers are created. Thermal annealing of irradiated LiF crystals with Φ ⩾ 1013 ions/cm2 at 400 K leads to a decrease of F centers (due to annihilation with H centers) and an enhancement of complex Fn color centers (neutral and charged) due to interaction with thermally activated anion vacancies. Annealing LiF crystals at higher temperature (T ⩾ 400 K) leads to a decrease both of F centers and Fn centers. In the annealing process up to 480 K the F2 and F 3 + centers are dominating until their reduction above 590 K. At temperatures above 740 K mainly small Li and trace element (Mg, Na) colloids are present in the absorption spectrum. The role of anion vacancies on color center creation and annealing is discussed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-01-01 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms |