Li colloids formation study induced by reactor neutrons in LiF single crystals

Izerrouken, M.; Souami, N.; Guerbous, L.; Djaroum, S.; Kadouma, Mourad; Sari, A.; Meftah, A.

doi:10.1016/j.nimb.2008.03.109

Cited by 10 publications

(6 citation statements)

References 31 publications

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“…[15] Irradiation of LiF with ionizing radiation-X-rays, electrons, ions, extreme UV light, etc.-causes the stable formation of primary and aggregate point defects. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] Aggregate F 2 and F 3 þ color centers -two electrons bound to two and three close anion vacancies, respectively-feature visible Stokes-shifted emission in the red (F 2 ) and green (F 3 þ ). [32] As it is well known, the same color center F 2 , F 3 þ (Table 2) are produced in LiF under thermal neutron and γ-ray irradiation at room temperature.…”

Section: Resultsmentioning

confidence: 99%

“…[ 15 ] Irradiation of LiF with ionizing radiation—X‐rays, electrons, ions, extreme UV light, etc.—causes the stable formation of primary and aggregate point defects. [ 16–31 ] Aggregate F 2 and F 3 + color centers —two electrons bound to two and three close anion vacancies, respectively—feature visible Stokes‐shifted emission in the red (F 2 ) and green (F 3 + ). [ 32 ]…”

Section: Resultsmentioning

confidence: 99%

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Influence of Neutron Irradiation Conditions on Maximal Frequency of IR Absorption Spectra of LiF:OH Single Crystal

Akhvlediani

Dauletbekova

Baubekova

et al. 2023

Physica Status Solidi (a)

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For many solids operating under irradiation conditions, the study of their behavior at the neutron irradiation is of importance. Herein, the influence of neutron irradiation conditions on the infrared (IR) absorption spectra of LiF crystals containing different amounts of hydroxyl and metallic impurities is considered. The investigations are carried out for discovering new peculiarities under the extreme irradiation conditions of LiF—being a very important material for practical applications. In the crystals with OH− impurity after the action of neutron irradiation, quite clear bands are appeared in the region of 1900–2200 cm−1. The delivered doses vary from 1014 to 3 × 1017nnvt. LiF crystals are investigated by differing both in qualitative and quantitative contents of OH− ions. With the increase in irradiation dose, the maximum IR absorption of all investigated groups of crystals shifts to the region of low energies. The appearance of a new band in the IR spectrum and its shift as a function of dose is associated with the radiolysis of OH− molecule.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Influence of Neutron Irradiation Conditions on Maximal Frequency of IR Absorption Spectra of LiF:OH Single Crystal

Akhvlediani

Dauletbekova

Baubekova

et al. 2023

Physica Status Solidi (a)

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“…The radiation effect was ascribed to saturated absorption of shallow F 2 color centers each trapping and releasing an electron at the picosecond rate. Besides generation of primary neutral F-H and charged α-I pair defects, Li metallic colloids are known to grow during long term irradiation by means of aggregation of anion vacancies in bubbles and interstitial cations in colloids by slow diffusion process [10][11][12][13][14][15] and may limit the operation resource of laser device. The important role of H and OH impurity centers in non-linear effects was noted in [7,16].…”

Section: Introductionmentioning

confidence: 99%

“…Possible effects of electron-positron pairs and nuclear reactions produced by γ-quanta on phase transformations were not considered [18]. The opinion that «ionizing irradiations of LiF cause radiolysis with F release from the surface» was proved by generation of anion vacancies and their aggregates and based on assumption of decay of localized excitons into defects [7][8][9][10][11][12][13][14][15][16]. However, this decay model did not consider / explain what kind of nuclear moment expels F ion from its site and why lighter Li ions are not expelled by the nuclear excitation and instead assemble in colloids.…”

Section: Introductionmentioning

confidence: 99%

"Growth of Li-B nanocrystals on the Surface of LiF Laser Crystal at 60Co Gamma-Irradiation"

Ibragimova

2021

JOJMS

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This work was aimed at studying structure-phase transformations in passive laser Q-switch made of LiF:OH, interfaces and nanoparticles, grown at exposure to isotropical 60Coγ-quanta flux to the doses 107-108 R, combining SEM, SPM, XRD, UV-vis and FTIR techniques. The origin crystal contains Li and LiH nanophases, and after the irradiation at 273 K low symmetric LiBH phases with larger lattice parameters can grow only on the surface as separated hillocks, while at 320 K atom diffusion allows to assemble a wall of these phases. Optical spectra contain both absorption and scattering centers with the ratio depending on the irradiation temperature. Oxygen could have come from air. The only origin of so many atoms of B and H and more Li is a special nuclear branching decay 19F9+γ→11B5+7Li3+1H1 under absorption of 1.17 and 1.33 MeV γ-quanta by F-nuclei. Another way is nuclear compound transmutation 13(НLiF)27+ γ→13(ВО)27→ 5B11 + 8O16

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“…Despite a wealth of studies of irradiation-induced defects in spinel such as simple color centers (F centers) [25], many characteristics of the evolution of simple defects into aggregates or colloid formation are not yet understood. Regardless of the matrix, only a handful of studies was reported on the irradiation-induced formation of metallic colloids in insulating materials [26][27][28][29]. Understanding such defect evolution is not only interesting for fundamental reasons but also for applications because colloid formation may degrade the insulating properties of the material.…”

Section: Introductionmentioning

confidence: 99%

Laser excited novel near-infrared photoluminescence bands in fast neutron-irradiated MgO·nAl2O3

Rahman

Haseeb

et al. 2016

Radiation Physics and Chemistry

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New near-infrared photoluminescence bands were observed in neutron-irradiated spinel single crystal upon excitation by a 532 nm laser. The surface morphology of the unirradiated and fast neutron-irradiated samples was investigated using atomic force microscopy and scanning probe microscopy. Fast neutronirradiated samples show a strong emission peak at 1,685 nm along with weak bands at 1,065 and 2,365 nm. The temperature dependence of the photoluminescence intensity was also measured. At lower temperatures, the dominant peak at 1,685 nm shifts toward lower energy whereas the other peaks remain fixed. Activation energies of luminescence quenching were estimated to be 5.7 and 54.6 meV for the lower and higher temperature regions respectively.

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Li colloids formation study induced by reactor neutrons in LiF single crystals

Cited by 10 publications

References 31 publications

Influence of Neutron Irradiation Conditions on Maximal Frequency of IR Absorption Spectra of LiF:OH Single Crystal

Influence of Neutron Irradiation Conditions on Maximal Frequency of IR Absorption Spectra of LiF:OH Single Crystal

"Growth of Li-B nanocrystals on the Surface of LiF Laser Crystal at 60Co Gamma-Irradiation"

Laser excited novel near-infrared photoluminescence bands in fast neutron-irradiated MgO·nAl2O3

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