New optical oxygen-deficient centers in 80 keV Re-implanted amorphous silica

Zatsepin, A. F.; Kuznetsova, Yu. A.; Shtang, T.V.; Mikhaylov, A. N.; Koubisy, M. S. I.

doi:10.1016/j.jnoncrysol.2019.119775

Cited by 14 publications

(6 citation statements)

References 33 publications

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“…38 The tetrahedral coordination linked with a network former function has been argued to be preferentially occupied by Fe 3+ ions in borosilicate glasses. 39,40 Still, in accord with Bingham et al, 38 it may be suggested that 6 A 1 (S) → 4 T 2 (D) transitions in Fe 3+ ions in either tetrahedral or octahedral coordination could be accountable for the visible absorption in the ISG.…”

Section: Optical Absorption Analysismentioning

confidence: 66%

“…While the presence of intrinsic defects such as NBOHC and POR has been studied extensively in amorphous silica, 4,5 obtaining models that can accurately account for their structure and optical properties in a variety of matrices is not straightforward 48,61,62 . The specific nature of defects is not always clear, and thus even new centers are still proposed as revealed for instance with the aid of PL spectroscopy for 80 keV Re‐implanted silica 6 . Intrinsic luminescence features have also been reported for silicate 48,62–65 and borate 47,65,66 glasses.…”

Section: Resultsmentioning

confidence: 99%

“…Next, we consider the possibility of iron species to be at the origin of the PL features given the significant iron detected in the ISG as 0.065-0.068 mass% Fe 2 O 3 , 3 but that became evident as Fe 2+ and Fe 3+ ions (Figure 7). The presence of Fe 2+ as d 6 ions in glasses is typically associated with PL quenching and not attributed any luminescence of its own. 52,53 Thus, it can easily be ruled out as potential source of the emitting bands observed in Figure 9A,B.…”

Section: Pl Spectroscopy and Emission Dynamics Assessmentmentioning

confidence: 99%

“…The PL technique has been already documented useful for studying optically active oxygen‐deficient centers in amorphous silicon dioxide, such as a nonbridging oxygen hole center (NBOHC), usually denoted as ≡Si–O•, or a peroxy radical (POR), represented as ≡Si–O–O• 4,5 . Further, PL spectroscopy allows for the discovery of new centers, as for instance reported recently for 80 keV re‐implanted silica 6 . Accordingly, it appears promising for ultimately scrutinizing radiation‐induced damage on the borosilicate ISG system.…”

Section: Introductionmentioning

confidence: 99%

“…4,5 Further, PL spectroscopy allows for the discovery of new centers, as for instance reported recently for 80 keV re-implanted silica. 6 Accordingly, it appears promising for ultimately scrutinizing radiation-induced damage on the borosilicate ISG system.…”

Section: Introductionmentioning

confidence: 99%

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Physico‐chemical properties of international simple glass (ISG) nuclear waste simulants: Luminescence baseline study

2022

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Borosilicate glass has been adopted internationally for the treatment of nuclear waste with the object of long‐term stabilization through vitrification. Aiming to facilitate experimental comparisons across laboratories, the six‐component international simple glass (ISG) was developed as benchmark. The original ISG produced by Mo‐SCI Corporation (Rolla, MO) was distributed and characterized for different physical properties thus serving as reference for further studies. Still, photoluminescence (PL) properties, which may be useful for scrutinizing radiation‐induced damage, have not been reported. Further, the original ISG contained significant iron impurities, which may present interference in various studies (e.g., optical). Consequently, two new ISG analogs lacking iron impurities (labeled ISG‐1 [closest composition to original ISG] and ISG‐2 [some MgO added at expense of CaO]) were synthesized by Corning Inc. (Corning, NY) (also doped with lanthanum for subsequent corrosion tests involving atom probe tomography), which remain to be fully characterized. Accordingly, this work was undertaken to perform a comprehensive study comparing the three ISG specimens. Various characterizations were then performed on the pristine glasses: X‐ray diffraction and vibrational spectroscopy (structural properties); static‐leach product consistency test (PCT, dissolution behavior); dilatometry and calorimetry measurements (thermal properties); and optical absorption with Tauc and Urbach plots analysis, followed by PL spectroscopy with decay kinetics assessment (optical properties). While the general structural features appeared similar among the glasses, the deconvolution of Raman spectra suggested a lower degree of connectivity in the silica network for ISG‐2. In addition, some differences were indicated from the PCT results and thermal properties assessed, which were discussed based on compositional variations. Further on, the optical properties were shown to be the most distinct. The optical absorption of the original ISG was characterized by Fe2+/Fe3+ impurities not detected for ISG‐1 and ISG‐2. The glasses all exhibited two main PL features (∼1.8 and 2.5 eV) with multiexponential decay behavior apparently of intrinsic origin. In addition, ISG‐1 and ISG‐2 showed a third high‐energy (∼3.4 eV) fast‐decaying contribution tentatively credited to tin impurities, which appeared most significantly for ISG‐1. The results are expected to serve as baseline for future studies simulating the effects of radioactive element decay.

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