Luminescence study of defects in silica glasses under near-UV excitation

is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. AbstractThe mechanical behavior of materials is usually simulated by a continuous mechanics approach. However, noncontinuous phenomena such as multi-fracturing cannot be accurately simulated using a continuous description. The discrete element method (DEM) naturally accounts for discontinuities and is therefore a good alternative to the continuum approach.This study continues previous work in which a DEM model was developed to quantitatively simulate an elastic material with the cohesive beam bond model. The simulation of brittle cracks is now tackled. This goal is attained by computing a failure criterion based on an equivalent hydrostatic stress. This microscopic criterion is then calibrated to fit experimental values of the macroscopic failure stress. The simulation results are compared to experimental results of indentation tests in which a spherical indenter is used to load a silica glass, which is considered to be a perfectly brittle elastic material.

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“…The experimental procedure were similar to those described in (35,36). Tables 2 and 3 list the properties of the indenter and the silica sample.…”

Section: Overview Of Experimental Observations Used As Referencementioning

confidence: 99%

Using the discrete element method to simulate brittle fracture in the indentation of a silica glass with a blunt indenter

Debenath

Jebahi

Iordanoff

et al. 2013

Computer Methods in Applied Mechanics and Engineering

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“…Two broad emission bands between 300 and 500 nm were identified in the collected spectra and could be assigned to oxygen deficiency centres (ODC) from the glass network [30,66,67]. The band around 360 nm appearing both in Fig.…”

Section: Grisaille Paint Layersmentioning

confidence: 98%

“…The analyse is done by the spectral analysis of the luminous plume generated by pulsed laser ablation of a small amount of material from the sample surface. [17,[26][27][28] Complemented with LIF in an entirely non-invasive approach, analytical information on trace elements and/or chromophores in glassy materials can also be obtained [17,[29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Laser-based techniques for the non-invasive characterisation of grisaille paints on stained-glass windows

et al. 2023

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Grisaille was the first paint applied on stained-glass panels, used in Europe since the twelfth century. Historical written sources described the use of iron and copper together with a high lead-silica base glass in the grisailles production. This project aims to study the evolution of the grisaille paint composition throughout time and the changes in the raw materials used in their production using non-destructive and non-invasive techniques. To achieve this objective, 23 grisaille samples dated from the 13th to the twentieth centuries from nine different countries (Portugal, Poland, United Kingdom, Sweden, Norway, Belgium, Low Countries, Germany, and France) were studied by means of micro particle-induced X-ray emission (μ-PIXE), micro energy dispersive X-ray fluorescence (μ-EDXRF), laser-induced breakdown spectroscopy (LIBS), laser-induced fluorescence (LIF), non-linear optical microscopy (NLOM) in the modality of multiphoton excitation fluorescence (MPEF) and optical microscopy (OM). The results showed that it was possible to identify compositional differences and patterns throughout the samples when compared with literature results. The preference for using copper in central and south-central European countries and the addition of new compounds (CoO, Cr2O3, MnO) as colouring agents since the nineteenth century was verified. The LIBS analyses allow the identification of boron on two samples, confirming the change of base glass components since the seventeenth century. The NLOM-MPEF showed the capability of this technique to measure the grisaille paint layers’ thickness. This non-invasive multi-analytical and complementary approach proves itself efficient in identifying changes in the grisaille’s composition throughout time, which can be interpreted as changes in the raw materials and manufacture used in the production of these paint materials.

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“…Previous works, using LIBS, have focused on finding the optimal parameters for the analysis of model soda-lime silicate [33] and historical lead silicate glasses [34], on the characterization of chromophores and opacifiers of ancient glasses, and on characterizing degradation pathologies [35,37,39,40]. From a complementary perspective, LIF spectroscopy provides valuable molecular information and facilitates the detection of trace elements and/or chromophores responsible for the glass coloration in a totally non-invasive way [30,[41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic and Microscopic Characterization of Flashed Glasses from Stained Glass Windows

et al. 2022

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Flashed glasses are composed of a base glass and a thin colored layer and have been used since medieval times in stained glass windows. Their study can be challenging because of their complex composition and multilayer structure. In the present work, a set of optical and spectroscopic techniques have been used for the characterization of a representative set of flashed glasses commonly used in the manufacture of stained glass windows. The structural and chemical composition of the pieces were investigated by optical microscopy, field emission scanning electron microscopy-energy dispersive X-ray spectrometry (FESEM-EDS), UV-Vis-IR spectroscopy, laser-induced breakdown spectroscopy (LIBS), and laser-induced fluorescence (LIF). Optical microscopy and FESEM-EDS allowed the determination of the thicknesses of the colored layers, while LIBS, EDS, UV-Vis-IR, and LIF spectroscopies served for elemental, molecular, and chromophores characterization of the base glasses and colored layers. Results obtained using the micro-invasive LIBS technique were compared with those retrieved by the cross-sectional technique FESEM-EDS, which requires sample taking, and showed significant consistency and agreement. In addition, LIBS results revealed the presence of additional elements in the composition of flashed glasses that could not be detected by FESEM-EDS. The combination of UV-Vis-IR and LIF results allowed precise chemical identification of chromophores responsible for the flashed glass coloration.

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Luminescence study of defects in silica glasses under near-UV excitation

Cited by 18 publications

References 6 publications

Using the discrete element method to simulate brittle fracture in the indentation of a silica glass with a blunt indenter

Using the discrete element method to simulate brittle fracture in the indentation of a silica glass with a blunt indenter

Laser-based techniques for the non-invasive characterisation of grisaille paints on stained-glass windows

Spectroscopic and Microscopic Characterization of Flashed Glasses from Stained Glass Windows

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