Effects of iron on the formation and annihilation of X-ray irradiation induced non-bridging oxygen hole centers in soda-lime silicate glass

Kadono, Kohei; Itakura, Nobuyuki; Akai, Tomoko; Yamashita, Masaru; Yazawa, Tetsuo

doi:10.1016/j.jnoncrysol.2009.11.013

Cited by 18 publications

(10 citation statements)

References 21 publications

(30 reference statements)

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“…This is because the amount of Cu + increased during the glass melting process due to the redox reaction as described by Equation . Furthermore, in the Fe 3+ ‐containing glasses, it is expected that the reaction for the electron capture shown in Equation occurs through X‐ray irradiation . This reaction competes with reaction and suppresses the increase in the amount of Cu + .…”

Section: Discussionmentioning

confidence: 99%

Radiophotoluminescence phenomenon in copper‐doped aluminoborosilicate glass

et al. 2018

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Radiophotoluminescence phenomena have been widely investigated on various types of materials for dosimetry applications. We report that an aluminoborosilicate glass containing 0.005 mol% copper exhibits intense photoluminescence in the visible region induced by X‐ray and γ‐ray irradiation. The luminescence is assigned to the 3d94s1 → 3d10 transition of Cu+. The proportionality of the intensity of the induced photoluminescence to the irradiation dose was confirmed up to 0.5 kGy using 60Co γ‐ray irradiation. Based on the spectroscopic results, a potential mechanism was proposed for the enhancement of the photoluminescence. The exposure to the ionizing radiation generates electron‐hole pairs in the glass, and the electrons are subsequently captured by the Cu2+ ions, which are converted to Cu+ and emit the luminescence. For the glass containing 0.01 mol% copper, the pronounced enhancement of the photoluminescence was not observed because the reverse reaction, ie, the capture of the holes by the Cu+ ions, becomes prominent. The photoluminescence induced by the irradiation was stably observed for the glasses kept at room temperature and even for the glasses heat‐treated at 150°C. However, the induced photoluminescence could be eliminated by the heat treatment at a temperature at 500°C, and the glass returned to the initial pre‐irradiation state. The Cu‐doped aluminoborosilicate glass is a potential candidate for use in dosimetry applications.

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Section: Discussionmentioning

confidence: 99%

Radiophotoluminescence phenomenon in copper‐doped aluminoborosilicate glass

et al. 2018

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“…[35]. A recent study [32] tends to show that the Fe 3+ to Fe 2+ reduction is accompanied with the formation of NBOHCs in soda-lime silicate glasses: More NBOHCs were created upon X-ray irradiation in soda-lime silicate glasses doped with 0.01 to 0.07 wt.% Fe 2 O 3t than in the undoped glasses. Increased defects density as Fe 3+ is reduced to Fe 2+ at low Fe 2 O 3t content was also observed for X-ray irradiated silicate glasses [29].…”

Section: Fe 3+ In Trace and Minor Amounts In Glassesmentioning

confidence: 95%

“…The changes in the oxidation states of iron upon ionizing radiations have been the subject of many studies, e.g. [26,[29][30][31][32]. It can be drawn from the latter studies the general conclusions that Fe 3+ as an impurity or as a dopant experiences an irradiation-induced reduction to Fe 2+ by trapping an electron: Fe 3+ + e − → Fe 2+ , which can be rewritten:…”

Section: Fe 3+ In Trace and Minor Amounts In Glassesmentioning

confidence: 99%

Redox kinetics of iron in alkali silicate glasses exposed to ionizing beams: Examples with the electron microprobe

Fialin¹,

Wagner²

2012

Journal of Non-Crystalline Solids

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“…This is due to the large spin-orbit coupling constant of the oxygen atom and the small g-values reported for NBOHC and peroxy species match well to those determined for the signal we observe. [37][38][39] However, it is uncommon to see the signal of NBOHC species persist at room temperature. 37 Conversely, peroxy radicals have been observed to be relatively temperature independent when in a rigid matrix.…”

Section: Changes In Chemistrymentioning

confidence: 99%

Gamma irradiation and oxidative degradation of a silica-filled silicone elastomer

Labouriau

Cady

Gill

et al. 2015

Polymer Degradation and Stability

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The radiation oxidative degradation of a commonly used silica-filled silicone elastomer DC745 was investigated by a series of experimental techniques. This elastomer is known to be chemically and thermally stable, but insufficient data exist on its radiation resistance. In the present work, gamma doses up to 200 kGy were applied under air at room temperature and 1 Gy/s. Chemical changes due to radiation were investigated by NMR, FT-IR, resonance Raman, and mass spectroscopy. DSC and TGA experiments probed thermal transitions and thermal stability changes with exposure dose. SEM probed variations on the surface of the elastomer, and changes in the polymer network were investigated using solvent swelling methods. Electron paramagnetic resonance (EPR) was employed to detect and identify free radicals. Uniaxial compression load tests at variable temperatures were performed to assess changes in the material"s mechanical response as a function of radiation dose. Results demonstrate that, with increasing exposure, DC745 undergoes changes in chemistry that lead to an increase in thermal stability and cross-link density, formation of free radical species, decrease in heat of fusion and increase in stiffness at low temperatures. Taken together, these results indicate that oxidative crosslinking is the dominant radiolysis mechanism that occurs when this material is exposed to gamma irradiation in air.

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Effects of iron on the formation and annihilation of X-ray irradiation induced non-bridging oxygen hole centers in soda-lime silicate glass

Cited by 18 publications

References 21 publications

Radiophotoluminescence phenomenon in copper‐doped aluminoborosilicate glass

Radiophotoluminescence phenomenon in copper‐doped aluminoborosilicate glass

Redox kinetics of iron in alkali silicate glasses exposed to ionizing beams: Examples with the electron microprobe

Gamma irradiation and oxidative degradation of a silica-filled silicone elastomer

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