Boson peak, heterogeneity and intermediate-range order in binary SiO2-Al2O3 glasses
| العنوان: | Boson peak, heterogeneity and intermediate-range order in binary SiO2-Al2O3 glasses |
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| المؤلفون: | Lothar Wondraczek, Kay Schuster, Katrin Wondraczek, Omar Benzine, Mariana Fatobene Ando, Stephan Grimm, Jean-Luc Garden, Zhiwen Pan |
| المساهمون: | Thermique Elaboration Matériaux Applications (ThEMA), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institute of Photonic Technology (IPHT), IPHT Jena: Institute of Photonic Technology, OTTO SCHOTT INST, Friedrich-Schiller-Universität = Friedrich Schiller University Jena [Jena, Germany] |
| المصدر: | Scientific Reports Scientific Reports, Nature Publishing Group, 2018, 8, pp.5394. ⟨10.1038/s41598-018-23574-1⟩ Scientific Reports, Vol 8, Iss 1, Pp 1-14 (2018) |
| بيانات النشر: | Springer Science and Business Media LLC, 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Length scale, optical fiber, Materials science, lcsh:Medicine, Physics::Optics, 02 engineering and technology, 01 natural sciences, Heat capacity, Molecular physics, Article, symbols.namesake, 0103 physical sciences, vibrational density, Rayleigh scattering, lcsh:Science, ComputingMilieux_MISCELLANEOUS, [PHYS]Physics [physics], 010302 applied physics, Multidisciplinary, Dopant, structural heterogeneity, Attenuation, lcsh:R, technology, industry, and agriculture, Gain, 021001 nanoscience & nanotechnology, Molecular vibration, symbols, lcsh:Q, 0210 nano-technology, Raman spectroscopy |
| الوصف: | In binary aluminosilicate liquids and glasses, heterogeneity on intermediate length scale is a crucial factor for optical fiber performance, determining the lower limit of optical attenuation and Rayleigh scattering, but also clustering and precipitation of optically active dopants, for example, in the fabrication of high-power laser gain media. Here, we consider the low-frequency vibrational modes of such materials for assessing structural heterogeneity on molecular scale. We determine the vibrational density of states VDoS g(ω) using low-temperature heat capacity data. From correlation with low-frequency Raman spectroscopy, we obtain the Raman coupling coefficient. Both experiments allow for the extraction of the average dynamic correlation length as a function of alumina content. We find that this value decreases from about 3.9 nm to 3.3 nm when mildly increasing the alumina content from zero (vitreous silica) to 7 mol%. At the same time, the average inter-particle distance increases slightly due to the presence of oxygen tricluster species. In accordance with Loewensteinian dynamics, this proves that mild alumina doping increases structural homogeneity on molecular scale. |
| تدمد: | 2045-2322 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f590312eba3379728c5002ee435d8fbb https://doi.org/10.1038/s41598-018-23574-1 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....f590312eba3379728c5002ee435d8fbb |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20452322 |
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