Positron annihilation Lifetime and Fourier transform infrared spectroscopic studies on Bi2O3–B2O3 glasses

Moh́sen, M.; Gomaa, Eman Zakaria; Al-Kotb, M.S.; Abdel-Baki, Manal; Fathy, Nehal

doi:10.1016/j.jnoncrysol.2015.10.036

Cited by 12 publications

(4 citation statements)

References 16 publications

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“…This confirming with the decrease in N4 ratio and with the -irradiation producing defect centres. Furthermore, the decrease in the intensity I2 as Bi2O3 content reaches up to 20 mol% reveals that the annihilation process of the present glass occurs mainly either as free annihilation or self-annihilation of p-Ps [49]. The non-linear behaviour of τ2 and I2 agrees very well with the non-linear behaviour of the density and molar volume discussed before [23].…”

Section: -Results and Discussionsupporting

confidence: 86%

Effect of gamma-ray on producing induced colour centres and on positron annihilation lifetime of bismuth-doped zinc sodium borate glasses

Ghanem

Mohamed

2021

Arab Journal of Nuclear Sciences and Applications

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A melt quenching method have been used for preparing a glass composition of the form (70-x)%B2O3-15%ZnO-15%Na2O-x%Bi2O3 (where x = 0, 5, 10, 15, 20, 25 mol %). The prepared glass was studied by FTIR and Positron annihilation lifetime measurements. FTIR analysis after 80 kGy -irradiation of bismuth-doped glass samples, show the dependence of the number of structural units BO3 and BO4 on the -irradiation dose. FTIR absorption spectra revealed that gamma irradiation produces a degree of a disorder or defects of the glass network which producing colour centres. The objective FTIR spectra were used to estimate the N4 ratio and its dependence on the composition. Positron annihilation lifetime measurements were carried out for all samples before and after 80 kGy -irradiation. Irradiated samples show a colour change, which is most likely due to the formation of colour centres. Such colour changes due to -irradiation allow estimating that the prepared glass samples can be used as a shielding material or as a radiation indicator sensor.

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Section: -Results and Discussionsupporting

confidence: 86%

Effect of gamma-ray on producing induced colour centres and on positron annihilation lifetime of bismuth-doped zinc sodium borate glasses

Ghanem

Mohamed

2021

Arab Journal of Nuclear Sciences and Applications

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“…However, in this study, the molar volume also increases with the increased content of Bi 2 O 3 , and this increase is due to the large ionic radius of bismuth (Bi 3+ = 1.03 Å) compared with the ionic radius of boron (B 3+ = 0.27 Å). This behavior appears in previous studies of similar types of glass under study [19,20].…”

Section: Xrd Transmittance Density and Molar Volumesupporting

confidence: 82%

Synthesis of Novel Li2O-CuO-Bi2O3-B2O3 Glasses for Radiation Protection: An Experimental and Theoretical Study

2023

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Glass samples were synthesized according to 10Li2O + 20CuO + xBi2O3 + (70 − x)B2O3, where x = 0, 10, 20, 30, 40 mol% by the melt-quenching method. The ability of the prepared glass to protect against gamma rays and neutrons was examined experimentally and theoretically. The mass attenuation coefficient (MAC) was calculated experimentally at energies of 0.662, 1.173, and 1.333 MeV using 137Cs and 60Co sources. The obtained results were compared with the theoretical ones using a Phy-x/PSD software program version 0.1.0.0. It was found that the experimental and theoretical results are very agreed upon. Moreover, other nuclear radiation shielding parameters were evaluated. The results showed that the addition of bismuth oxide leads to an improvement in the ability of the composite glass to attenuate gamma rays by increasing the values of MAC and Zeff, while it led to a decrease in the HVL and MFP, as well as the EBF and EABF. The results also showed that the addition of copper oxide led to an improvement in the ability of the present glass to slow down fast neutrons. Sample BiS40 showed the best result for gamma ray attenuation and sample BiS10 gave the best result for fast neutron removal cross section. The results were compared with some materials used for gamma ray shielding and fast neutron removal cross section, and it was concluded that samples Bi40 and BiS10 outperformed all commercial materials.

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“…The second lifetime τ 2 (410− 450 ps) is attributed to the annihilation of positrons at open volume defects. 49,50 The long lifetimes τ 3 (1.9−2.2 ns) and τ 4 (3.6−14.6 ns) are ascribed to the annihilation of o-Ps in the micropores of these ZIFs. Therefore, the last two lifetime components, τ 3 and τ 4 , can reflect the complex micropore structure information of these ZIFs.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Low-Pressure CO₂ Capture in Zeolite Imidazole Frameworks with Ultramicropores Studied by Positron Annihilation

Liu

Deng

et al. 2021

ACS Appl. Energy Mater.

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In this paper, three kinds of zeolite imidazole frameworks (ZIF-90, ZIF-93, and ZIF-94) were synthesized through hydrothermal reactions. Positron lifetime results reveal two kinds of pores corresponding to the channel in the windows and central cavity of ZIFs. The average diameters of the cavities are 1.12, 1.54, and 0.80 nm in ZIF-90, ZIF-93, and ZIF-94, respectively, while the average diameters of channels are between 0.55 and 0.60 nm. CO2 adsorption results show that ZIF-90 has the highest CO2 adsorption capacities (64.4 cm3 g–1 at 298 K and 104.7 cm3 g–1 at 273 K) at 1 bar, followed by ZIF-94 (57.9 cm3 g–1 at 298 K and 79.4 cm3 g–1 at 273 K) and ZIF-93 (41.5 cm3 g–1 at 298 K and 62.5 cm3 g–1 at 273 K). This shows inconsistency with the total pore volume but is in good agreement with relative volumes of pores smaller than 1.2 nm, which are 6.55, 2.06, and 5.60% for ZIF-90, ZIF-93, and ZIF-94, respectively. Further investigation reveals that an even smaller pore size is required for CO2 adsorption under ultralow pressure. At a pressure of 0.1 bar, ZIF-94 exhibits an ultrahigh CO2 adsorption capacity (21.2 cm3 g–1 at 298 K and 32.1 cm3 g–1 at 273 K) compared with ZIF-93 (10.1 cm3 g–1 at 298 K and 14.9 cm3 g–1 at 273 K) and ZIF-90 (5.9 cm3 g–1 at 298 K and 11.6 cm3 g–1 at 273 K). These quantities coincide well with the relative volumes of pores smaller than 0.8 nm, which are 5.60, 2.06, and 1.18% for ZIF-94, ZIF-93, and ZIF-90, respectively. Our results demonstrate that at atmospheric pressure, CO2 molecules are more effectively captured by micropores, while at extremely low pressures, CO2 molecules are mainly enriched around ultramicropores such as the channels and small cavities in ZIFs.

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Positron annihilation Lifetime and Fourier transform infrared spectroscopic studies on Bi2O3–B2O3 glasses

Cited by 12 publications

References 16 publications

Effect of gamma-ray on producing induced colour centres and on positron annihilation lifetime of bismuth-doped zinc sodium borate glasses

Effect of gamma-ray on producing induced colour centres and on positron annihilation lifetime of bismuth-doped zinc sodium borate glasses

Synthesis of Novel Li2O-CuO-Bi2O3-B2O3 Glasses for Radiation Protection: An Experimental and Theoretical Study

Low-Pressure CO₂ Capture in Zeolite Imidazole Frameworks with Ultramicropores Studied by Positron Annihilation

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Positron annihilation Lifetime and Fourier transform infrared spectroscopic studies on Bi2O3–B2O3 glasses

Cited by 12 publications

References 16 publications

Effect of gamma-ray on producing induced colour centres and on positron annihilation lifetime of bismuth-doped zinc sodium borate glasses

Effect of gamma-ray on producing induced colour centres and on positron annihilation lifetime of bismuth-doped zinc sodium borate glasses

Synthesis of Novel Li2O-CuO-Bi2O3-B2O3 Glasses for Radiation Protection: An Experimental and Theoretical Study

Low-Pressure CO2 Capture in Zeolite Imidazole Frameworks with Ultramicropores Studied by Positron Annihilation

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Low-Pressure CO₂ Capture in Zeolite Imidazole Frameworks with Ultramicropores Studied by Positron Annihilation