Thermoluminescence and low-temperature luminescence of beryllium oxide

Petrenko, M.D.; Огородников, И. Н.; Ivanov, V. Yu.

doi:10.1016/j.radmeas.2015.12.025

Cited by 8 publications

(4 citation statements)

References 17 publications

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“…These emission bands could be attributed to electron-hole recombination or band to band transition in the Mg 2 SnO 4 matrix. 27 The emission intensity increased as the measuring temperature increased from 84−120 K, and then decreased with further increasing the temperature to 300 K. The enhanced PL intensity at 120 K could be ascribed to the increased radiative recombination. On one hand, at a high measuring temperature (300 K), the PL emission intensity was quite weak due to the enhancement of nonradiative recombination.…”

Section: Resultsmentioning

confidence: 91%

Photoluminescence and Thermoluminescence Properties of Sol-Gel Auto-Combustion Driven Mg₂SnO₄ Nanophosphor

Tsega

Dejene

2018

ECS J. Solid State Sci. Technol.

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Nanocrystalline Mg 2 SnO 4 nanophosphor was synthesized by a facile sol-gel auto-combustion method calcined 800 • C for 1 h. The X-ray diffraction pattern showed that the nanopowder has a cubic inverse spinel polycrystalline structure with an average crystallite size of about 20 nm. The photoluminescence spectra were measured at 84−300 K, and the broad emission band was obtained in the wavelength range of 400−500 nm. Photoluminescence at 120 K showed the highest emission band centered around 414 nm. The thermoluminescence (TL) glow curve showed an increase in TL peak intensity with UV irradiation time due to the increasing number of inherent traps created by UV irradiation. The maximum TL intensity was found for 30 min UV exposure. Activation energies of the trapping centers were found between 0.39 eV and 0.48 eV. The frequency factor of the main glow-peak was also evaluated in the 3.03 × 10 6 -4.26 × 10 7 s −1 range for UV irradiated phosphor. The decrease in activation energy and frequency factor with increasing UV exposure time may attribute to the decrease in trap depth. The calculated trap parameters related to the glow peak show this phosphor may be useful in radiation dosimetry applications.

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Section: Resultsmentioning

confidence: 91%

Photoluminescence and Thermoluminescence Properties of Sol-Gel Auto-Combustion Driven Mg₂SnO₄ Nanophosphor

Tsega

Dejene

2018

ECS J. Solid State Sci. Technol.

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“…Therefore, the overview curves are presented in a semi-logarithmic (along the ordinate axis) scale, which ensures observing not only dominant but also low-intensity peaks. Second, the TL of undoped BeO crystals was previously studied in [40,41], where the first order of kinetics and the activation energy of E = 0.11 eV were determined for a low-temperature peak at 84-85.1 K. In our work, the TL glow curve of undoped BeO was reproduced under the same conditions, at which the TL of BeO:Mg crystals was studied. The TL glow curve for undoped BeO is given in Fig.…”

Section: Temperature Dependence Of Luminescencementioning

confidence: 85%

Low-temperature luminescence and thermally stimulated luminescence of BeO: Mg single crystals

2018

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Luminescence and thermally stimulated luminescence (TL) of BeO:Mg crystals are studied at T = 6-380 K. The TL glow curves and the spectra of luminescence (1.2-6.5 eV), luminescence excitation, and reflection (3.7-20 eV) are obtained. It is found that the introduction of an isovalent magnesium impurity into BeO leads to the appearance of three new broad luminescence bands at 6.2-6.3, 4.3-4.4, and 1.9-2.6 eV. The first two are attributed to the radiative annihilation of a relaxed near-impurity (Mg) exciton, the excited state of which is formed as a result of energy transfer by free excitons. The impurity VUV and UV bands are compared with those for the intrinsic luminescence of BeO caused by the radiative annihilation of self-trapped excitons (STE) of two kinds: the band at 6.2-6.3 eV of BeO:Mg is compared with the band at 6.7 eV (STE1) of BeO, and the band at 4.3-4.4 eV is compared with the band at 4.9 eV (STE2) of BeO. In the visible region, the luminescence spectrum is due to a superposition of intracenter transitions in an impurity complex including a magnesium ion. The manifestation of X-ray induced luminescence bands at T = 6 K in BeO:Mg indicates their excitation during band-to-band transitions and in recombination processes. The energy characteristics of the impurity states in BeO:Mg are determined; the effect of the isovalent impurity on the fluctuation rearrangement of the BeO:Mg structure in the thermal transformation region of STE1 →STE2 is revealed.

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“…At the same time, the study of the process of radiation oxidation of the surface of metals is of fundamental importance in radiation materials science from the point of view of the safety of atomic and nuclear reactors. Despite the fact that numerous experimental and theoretical works have been devoted to its study, some questions still remain open and unresolved [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Spectral-Luminescent and Electrophysical Study of Radiation Oxidation of Beryllium in Water

Gadzhieva,

Melikova,

Nurmammadova

et al. 2023

Problems of Atomic Science and Technology

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The radiation oxidation of Be in water at room temperature in the absorbed dose range Dγ = 0.5…180 kGy was studied by radiothermoluminescence (RTL), infrared reflection-adsorption spectroscopy (IRRAS), and electrical conductivity. The participation and role of surface relaxing intermediate-active particles in the dynamics of changes in the oxidation process are considered. Using the RTL method, the role of surface oxygen hole centers generated by γ-irradiation and chemisorbed oxygen in the formation of nanooxide films was experimentally established. The formation of nanooxide films on the surface of Be in water was traced in the IR reflection spectra. The kinetics of radiation oxidation of beryllium has been studied and its radiation passivation has been established. According to the logarithmic dose dependence of the surface resistivity Be, two stages of the oxidation process were revealed. It is shown that the formation of nano oxide films leads to a decrease in the surface electrical conductivity of beryllium by 2 orders of magnitude and an increase in the thickness of oxide films by 1.6 times.

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Thermoluminescence and low-temperature luminescence of beryllium oxide

Cited by 8 publications

References 17 publications

Photoluminescence and Thermoluminescence Properties of Sol-Gel Auto-Combustion Driven Mg₂SnO₄ Nanophosphor

Photoluminescence and Thermoluminescence Properties of Sol-Gel Auto-Combustion Driven Mg₂SnO₄ Nanophosphor

Low-temperature luminescence and thermally stimulated luminescence of BeO: Mg single crystals

Spectral-Luminescent and Electrophysical Study of Radiation Oxidation of Beryllium in Water

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Thermoluminescence and low-temperature luminescence of beryllium oxide

Cited by 8 publications

References 17 publications

Photoluminescence and Thermoluminescence Properties of Sol-Gel Auto-Combustion Driven Mg2SnO4 Nanophosphor

Photoluminescence and Thermoluminescence Properties of Sol-Gel Auto-Combustion Driven Mg2SnO4 Nanophosphor

Low-temperature luminescence and thermally stimulated luminescence of BeO: Mg single crystals

Spectral-Luminescent and Electrophysical Study of Radiation Oxidation of Beryllium in Water

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Photoluminescence and Thermoluminescence Properties of Sol-Gel Auto-Combustion Driven Mg₂SnO₄ Nanophosphor

Photoluminescence and Thermoluminescence Properties of Sol-Gel Auto-Combustion Driven Mg₂SnO₄ Nanophosphor