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- W3029687568 abstract "The detailed local structures of fluoroborosilicate glasses with the compositions of (50 + x)SiO₂–(20 – x)B₂O₃–10Na₂O–10NaF–10YF₃ (x = 0, 5, 10, 15 mol %) were investigated by advanced one- and two-dimensional solid-state nuclear magnetic resonance (SSNMR) techniques. The borosilicate glass network is characterized by ²⁹Si and ¹¹B magic angle spinning NMR (MAS NMR) spectra. ²⁹Si MAS spectra show that the silicate network strengthens with the decrease of the B₂O₃ content. Two three-coordination boron species (B⁽³⁾-ring, B⁽³⁾-nonring) and two four-coordination boron species (BO₄, BO₃F) are observed in the ¹¹B MAS spectra. The two types of B⁽⁴⁾ species are identified by ¹¹B triple-quantum magic angle spinning (TQMAS) and J-coupling-based ¹¹B{¹⁹F} heteronuclear multiple quantum coherence (J-HMQC) methods. The F– species are confirmed by ¹⁹F MAS spectra and a ¹⁹F{²³Na} rotational echo double resonance (REDOR) method, revealing the existence of Na–F–B and multiple Na–F–Y linkages. The clustering of F– ions is proved by ¹⁹F static spin echo results, which indicate that B³⁺ ions have a dispersive effect on F– ions. ¹¹B/²³Na REDOR results show that the distribution of Na⁺ around B⁽³⁾ and B⁽⁴⁾ is similar, and independent of the content of B₂O₃. On the basis of these results, a quantitative atomic structure evolution with glass compositions is investigated." @default.
- W3029687568 created "2020-06-05" @default.
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- W3029687568 date "2020-01-01" @default.
- W3029687568 modified "2023-09-27" @default.
- W3029687568 title "Structural Studies of Rare Earth-Doped Fluoroborosilicate Glasses by Advanced Solid-State NMR" @default.
- W3029687568 hasPublicationYear "2020" @default.
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