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- W2998196913 abstract "Photo-thermo-refractive (PTR) glass is an optically transparent photosensitive Na₂O–ZnO–Al₂O₃–SiO₂ glass, containing NaF and KBr additives, along with cerium, silver, tin, and antimony oxide dopants. After heating above 500 °C, UV-exposed regions of this glass produce permanent refractive index changes, resulting from precipitation of NaF nanocrystals. Short- and medium-range order of this glass system is studied via multinuclear single- and double-resonance solid-state nuclear magnetic resonance (NMR) spectroscopy in regular PTR glass and in model glasses with simplified compositions. The results, when combined with data from energy-dispersive X-ray spectroscopy, indicate that the NaF component modifies the standard aluminosilicate framework, producing small amounts of F-bonded five- and six-coordinated aluminum species. The fluoride speciation is obtained from ¹⁹F magic-angle spinning NMR spectra, supported by ¹⁹F{²⁷Al} and ¹⁹F{²³Na} dipolar recoupling experiments. The majority of fluoride within the PTR glass is found within Na-dominated local environments, which also interact strongly with the aluminum. ²³Na{¹⁹F} rotational echo double resonance reveals that about 1/3 of the Na⁺ ions have fluoride ions in their first coordination spheres." @default.
- W2998196913 created "2020-01-10" @default.
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- W2998196913 date "2019-01-01" @default.
- W2998196913 modified "2023-09-23" @default.
- W2998196913 title "Short- and Medium-Range Order in Photothermal Refractive Glass Revealed by Solid-State NMR Techniques" @default.
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