Impact of glass density on the green emission and NBOHC formation in silica glass: A combined high pressure and 2.5 MeV electron irradiation

Ollier, Nadège; Piven, K.; Martinet, C.; Billotte, Thomas; Martinez, V.; Neuville, Daniel R.; Lancry, Matthieu

doi:10.1016/j.jnoncrysol.2017.09.029

Cited by 19 publications

(10 citation statements)

References 32 publications

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“…The main drawback of this set-up is the electron irradiation occurring during the compression. However, most experiments reporting modification of silica by electron irradiation were performed using a high electron beam energy (MeV and high dose) [22] and TEM microscopy [23], whose voltage and electron beam energy are significantly higher than the corresponding one used in a SEM. Moreover, Kermouche et al [19] reported that beam-off experiments on the same pillars than those investigated in the present paper led to equivalent mechanical properties than those measured with beam-on experiments.…”

Section: Methodsmentioning

confidence: 99%

Highlighting the impact of shear strain on the SiO2 glass structure: From experiments to atomistic simulations

Martinet

Heili

Martinez

et al. 2020

Journal of Non-Crystalline Solids

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SiO 2 glass structure has been permanently modified by uniaxial compression. Within such a loading, the structure is supposed to be affected both by densification and shear flow. We propose to compare recovered silica samples with similar densities, initially deformed plastically under a hydrostatic compression or under a uniaxial compression. From micro-Raman spectroscopy experiments, the shear strain effects have been highlighted on the structural modifications of the glass and have been confirmed from molecular dynamic simulations. In particular, medium range order depends on the mechanical history in plastically deformed glasses. Indeed, both experiments and simulations demonstrate that small rings are favored when permanent shear strain acts with densification, thus allowing a structural signature identification of the densification process.

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Section: Methodsmentioning

confidence: 99%

Highlighting the impact of shear strain on the SiO2 glass structure: From experiments to atomistic simulations

Martinet

Heili

Martinez

et al. 2020

Journal of Non-Crystalline Solids

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“…Depending on the irradiation source, other point defect can be induced. Indeed, the literature shows that electron irradiation (2.5 MeV) of pre-densified bulk silica glasses reveals the presence of NBOHC and the presence of another defect associated to a PL band peaking at 540 nm [21] whose origin is still unclear. This green luminescence is also observed in bulk silica glass when irradiated with UV laser [22].…”

Section: Effect Of X-ray Irradiation In the Bulk Silica Glassmentioning

confidence: 99%

X-ray preconditioning for enhancing refractive index contrast in femtosecond laser photoinscription of embedded waveguides in pure silica

Royon

Marin

Girard

et al. 2018

Opt. Mater. Express

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We investigate femtosecond pulse laser-induced refractive index changes (∆n) in bulk fused silica (Corning 7980) subject to prior hard (40 keV) X-ray irradiation with accumulated doses up to 6 MGy. The preconditioning before photoinscription improves strongly the light transport of the laser-written embedded waveguides in a range of fluences and accumulation doses. Results show that the ultrafast laser-induced ∆n is higher in samples pre-irradiated with X-rays at similar laser photon dose. The effect lies in the kick-off generation of defects and precursors by energetic X-ray photons, enhancing a subsequent laser-induced densification process. The photoinscription efficiency increases up to a saturation point and the pre-treatment can be considered as an effective option for high contrast low loss index modifications and waveguiding structures in glasses.

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“…Figure 3(b) illustrates the photoluminescence spectra excited at 488 nm of the same irradiated samples (4 GPa_450 C) at RT and 600 K. These spectra are normalized to the emission band at $545 nm (green luminescence). Our recent work 24 has demonstrated a straight link between the green luminescence at $540 nm and the densification of silica. In particular, the defects responsible of this green luminescence are still unknown; however, it has been demonstrated that they are related to the silica densification.…”

mentioning

confidence: 93%

“…In particular, the defects responsible of this green luminescence are still unknown; however, it has been demonstrated that they are related to the silica densification. 24 Also, it has been shown that the compaction of silica modifies the spectral shape of the emission of the Non-Bridging Oxygen Hole Center (NBOHCs) defects at 650 nm, inducing an additional contribution at $610 nm interpreted as another NBOHC species with different surrounding environment. 24 We can also distinguish here the contribution at 610 nm in the irradiated samples as shown in Ref.…”

mentioning

confidence: 99%

Unique silica polymorph obtained under electron irradiation

Reghioua

Lancry

Cavani

et al. 2019

Applied Physics Letters

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High purity synthetic silica glass (Suprasil F300) samples were densified by High Pressure/High Temperature (HP-HT) using three different pressure/temperature/duration values. Their relaxation process was studied by applying 2.5 MeV electron irradiation with doses varying from 1 MGy up to 11 GGy. At very high dose (11 GGy), all the densified silica samples exhibit the same density value ($2.26 g/cm 3 ) regardless of the densification conditions, referring to an equilibrium value known as an amorphous silica metamict phase. In detail, the HP-HT silica samples were progressively dedensified from 1 GGy irradiation dose until reaching this equilibrium. Whatever the initial topological disorder revealed through Raman spectra, all silica samples present identical Raman spectra at 11 GGy, with high intensities of D 1 and D 2 components, attesting they reach one unique silica polymorph. Regarding the irradiation at high temperature (600 MGy, 600 K), the results show that the thermal annealing during irradiation "accelerates" somehow the relaxation kinetics of both macroscopic density and vibrational signature. Furthermore, it seems that such high irradiation temperatures lead to increase the Non-Bridging Oxygen Hole Center point defects generation.

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Impact of glass density on the green emission and NBOHC formation in silica glass: A combined high pressure and 2.5 MeV electron irradiation

Cited by 19 publications

References 32 publications

Highlighting the impact of shear strain on the SiO2 glass structure: From experiments to atomistic simulations

Highlighting the impact of shear strain on the SiO2 glass structure: From experiments to atomistic simulations

X-ray preconditioning for enhancing refractive index contrast in femtosecond laser photoinscription of embedded waveguides in pure silica

Unique silica polymorph obtained under electron irradiation

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