Evidence of depolymerisation of amorphous silica at medium- and short-range order: XANES, NMR and CP-SEM contributions.
This work reports medium- and short-range order of changes of amorphous silica submitted to chemical degradation. Structural changes were studied, using X-ray absorption near edge structure (XANES), nuclear magnetic resonance (29)Si NMR-MAS and controlled pressure scanning electron microscope (CP-SEM). The depolymerisation of amorphous SiO(2) compounds mainly induces the formation of Q(3) species and alkali-rich domains. The XANES Si K-edge spectra demonstrate the presence of different environments of silicon: one with four oxygen atoms and the other with a number of oxygen lower than four in agreement with previous studies.
Centre de Recherche de l'Ecole des Mines de Douai, Douai, France. khouchaf@ensm-douai.fr
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Khouchaf
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Hamoudi
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Cordier
D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008855:Microscopy, Electron, Scanning / Q000379:methods*; D011108:Polymers / Q000737:chemistry*
D011108:Polymers