Radiation defects in alkali metal sulfates

Nurakhmetov, Т.N.; Кутербеков, К. А.; Daurenbekov, D.H.; Salikhodzha, Zh.M.; Kainarbay, A.Zh.

doi:10.1016/j.radphyschem.2015.10.031

Cited by 7 publications

(7 citation statements)

References 18 publications

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“…The samples were excited by 6.2 eV-5.64 eV. Emission observed in a region of 3.7-3.8 eV at 300 K is associated with the recombination of an electron with a non-equivalently located hole above the valence band [7][8][9][10]. Emission bands determined in regions of 3.1-3.17 eV, 2.6-2.7 eV and 2.3-2.4 eV (only at 80 K) are associated with electron-hole trapping centres [10].…”

Section: Resultsmentioning

confidence: 99%

“…Lithium containing mixed alkali metal sulphates activated by rare earth ions are used as phosphors and highly sensitive thermoluminescent dosimeters [1][2][3][4]. Emissions observed in sulphates of alkali and alkaline earth metals are associated with the recombination of electrons with localised holes [5][6][7][8][9][10]. The spectral position of emission in such processes mainly depends on the crystallographic arrangement of localised holes (as SO 4 radicals).…”

Section: Introductionmentioning

confidence: 99%

“…Experimental and theoretical calculations [11] have shown that the orbital energy of an unpaired electron in the ground state of the SO 4 radical differs in different crystallographic directions of anisotropic crystals. Therefore, during the recombination of an electron from the conduction band or the local state of the electron trapping centre with holes SO 4 emission should appear in a certain spectral range [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Intrinsic emissions and formation of electron-hole trapping centres in excited Li2SO4

Nurakhmetov,

Alibay,

Tolekov

et al. 2023

chemija

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Vacuum ultraviolet and thermal activation spectroscopies were used to study the nature of intrinsic emission and the mechanisms of the formation of electron and hole trapping centres in irradiated Li2SO4 powders and crystals. The obtained results along with excitation spectra showed that recombination emission at 3.8–4.2 eV and 4.5–5.5 eV occurs when an electron passes from the second and third sub-bands of the valence band formed from the 2p state of oxygen to the conduction band. It has been determined that Li2SO4 electron and hole trapping centres are created when electrons are trapped in the SO42– anionic sites. The holes are localised in the form of SO4 – radicals. The spectral position and intensity of individual emission bands are dependent on the crystallographic arrangement of localised holes.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Intrinsic emissions and formation of electron-hole trapping centres in excited Li2SO4

Nurakhmetov,

Alibay,

Tolekov

et al. 2023

chemija

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“…Moreover, the irradiation of sulfate promotes the formation of other species like SO4−, SO3−, SO2−, O − and O3− by the formation of electron-hole trapping centers [14], being SO4− the primary defect produced (Eq. (1)), which may be monitored by EPR spectroscopy [15, 16].…”

Section: Resultsmentioning

confidence: 99%

Solid adenine and seawater salts exposed to gamma radiation: An FT-IR and EPR spectroscopy analysis for prebiotic chemistry

Baú

Valezi

Villafañe-Barajas

et al. 2019

Heliyon

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Solids of adenine obtained from distilled water and seawater lyophilized solutions were γ irradiated at a 94.52 kGy dose. Results indicate that pure solid adenine had a low degradation rate, likewise the solid containing seawater salts. However, EPR spectroscopy analysis suggests a high interaction of the radiation with seawater salts, by radical formation in sulfate ions. These outcomes are of interest for prebiotic chemistry, since ions could have played important roles in chemical evolution. In addition, Martian soil is rich in sulphate salts, thus these salts could protected organic molecules being degraded by γ-radiation.

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“…Only a few studies have been carried out showing the luminescence properties of SrSO 4 by doping it with rare-earth elements. [13,14,21,22] Similarly, few reports are available in the literature on intrinsic recombination luminescence in various alkali metal sulphates [23][24][25][26][27] and calcium sulphate [28,29] providing results on defect-based luminescence having a Stokes shift. Recently, Bao-gai Zhai et al have also shown intrinsic PL and cyan-coloured afterglow in undoped SrSO 4 nanoplates on UV excitation due to the presence of defects, mainly due to oxygen vacancies.…”

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confidence: 99%

Infrared‐to‐visible conversion in strontium sulphate through a defect‐based infrared stimulated visible emission phenomenon

et al. 2023

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Strontium sulphate (SrSO4) is a defect‐based photoluminescence material, generally used in thermoluminescence applications, and has been studied for infrared (IR) stimulated visible emission. The SrSO4 particles were synthesized using a precipitation method. The orthorhombic phase of SrSO4 was confirmed from the X‐ray diffraction pattern and the formation of micron‐sized particles was authenticated from field emission scanning electron micrographs. The elemental composition of oxygen and strontium was determined using energy‐dispersive X‐ray analysis measurement that confirmed the presence of VO•• and VSr′′ intrinsic defects in the material. Photoluminescence investigations showed the presence of various defect bands in the band gap giving rise to intrinsic luminescence in SrSO4. The emission in the visible region was attributed to the defect band arising due to 0.25emVO••. Photoluminescence lifetime measurement confirmed the presence of stable defect states with a lifetime in microseconds. The SrSO4 sample was tested using IR lasers and a red–orange emission spot was observed from the powder sample when excited with IR lasers. The underlying principle for IR‐to‐visible conversion in the material is a defect‐mediated phenomenon that has been described through the energy level diagram of the material.

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Radiation defects in alkali metal sulfates

Cited by 7 publications

References 18 publications

Intrinsic emissions and formation of electron-hole trapping centres in excited Li2SO4

Intrinsic emissions and formation of electron-hole trapping centres in excited Li2SO4

Solid adenine and seawater salts exposed to gamma radiation: An FT-IR and EPR spectroscopy analysis for prebiotic chemistry

Infrared‐to‐visible conversion in strontium sulphate through a defect‐based infrared stimulated visible emission phenomenon

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