Ti3+ production under ionizing radiation in aluminoborosilicate glasses studied by EPR spectroscopy

Lombard, Pierre; Ollier, Nadège; Boizot, Bruno

doi:10.1016/j.jnoncrysol.2010.12.070

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…According to the g-factor analysis, at three different positions, compared with the nonirradiated glass, E′ centers (≡Si, g = 2.0006) and NBOHC (g = 2.0093) appeared [ 17 ], and a non-bridge formed by the B ion group was formed in the center position. The strong signal front formed at g = 1.901 may originate from point defects formed by alkali metal impurity ions [ 18 ], such as Na + and Ti 4 + in the glass under the combined influence of laser and environmental radiation. The defect signal strength at the center position was significantly higher than the edge position, indicating that the center position had more defects than the edge position.…”

Section: Resultsmentioning

confidence: 99%

Optical Properties of Thomson Scattering Diagnostics Lower Window Glass under Laser Irradiation

et al. 2021

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Tokamak diagnostic window glass is an indispensable optical medium in fusion research. The transmittance of the device affects the optical performance and accuracy of the diagnostic system. Especially, the window glass serves as the entrance of the light source while performing the sealing function for the active diagnosis method represented by Thomson scattering diagnostics. In this work, we studied the influence of the laser irradiation and tokamak discharge on the EAST (Experimental Advanced Superconducting Tokamak) Thomson scattering diagnostic borosilicate glass window. Using X-ray photoelectron spectroscopy (XPS) and Raman scattering, we found that carbon-based impurities in the device aggravated the film damage due to laser irradiation, reducing the performance of the coating of the glass. Besides, the laser and the various rays of tokamak discharge generated many point defects in the glass, increasing the light absorption of the glass. These two factors caused the glass transmittance to drop significantly (from 99.99% to 77.62%). In addition, the long-term laser irradiation primarily reduced the transmittance, while environmental rays had a minor impact on the same. This work provides valuable insights into the selection and effective use of glass in optics-based diagnostics.

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Section: Resultsmentioning

confidence: 99%

Optical Properties of Thomson Scattering Diagnostics Lower Window Glass under Laser Irradiation

et al. 2021

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“…Literature e vidence for Ti 3+ in Ti-bearing silicate glasses is scarce. Ti 4+ reduction in Ti 3+ has been achieved using irradiation in silica and aluminoborosilicate glas se s [ 16,17 ]. Li 2 Si 4 O 9 , Na 2 Si 4 O 9 and other sodium silicate glasses doped with Ti 2 O 3 and fused at fO 2 ~ 10 -8 also appear to contain Ti 3+ after quenc hing [9,18].…”

Section: Discussionmentioning

confidence: 99%