dorsal/arxiv
View SchemaIncorporation of H_2 in vitreous silica, qualitative and quantitative determination from Raman and infrared spectroscopy
| Authors | Burkhard C. Schmidt, François Holtz, Jean-Michel Bény |
|---|---|
| Categories | |
| ArXiv ID | physics/0608311 |
| URL | https://arxiv.org/abs/physics/0608311 |
| DOI | 10.1016/S0022-3093(98)00698-X |
| Journal | Journal of Non Crystalline Solids 240 (1998) 91-103 |
Abstract
Incorporation mechanisms of H_2 in silica glass were studied with Raman and infrared (IR) microspectroscopy. Hydrogenated samples were prepared at temperatures between 800 deg C and 955 deg C at 2 kbar total pressure. Hydrogen fugacities (f_{H_2}) were controlled using the double capsule technique with the iron-w\"ustite (IW) buffer assemblage generating f_{H_2} of 1290-1370 bars corresponding to H_2 partial pressures (P_{H_2}) of 960-975 bars. We found that silica glass hydrogenated under such conditions contains molecular hydrogen (H_2) in addition to SiH and SiOH groups. H_2 molecules dissolved in the quenched glasses introduce a band at 4136 cm^{-1} in the Raman spectra which in comparison to that of gaseous H_2 is wider and is shifted to lower frequency. IR spectra of hydrogenated samples contain a band at 4138 cm^{-1} which we assign to the stretching vibration of H_2 molecules located in non-centrosymmetric sites. The Raman and IR spectra indicate that the dissolved H_2 molecules interact with the silicate network. We suggest that the H_2 band is the envelope of at least three components due to the occupation of at least three different interstitial sites by H_2 molecules. Both, Raman and IR spectra of hydrogenated glasses contain bands at ~2255 cm^{-1} which may be due to the vibration of SiH groups.
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"abstract": "Incorporation mechanisms of H_2 in silica glass were studied with Raman and\ninfrared (IR) microspectroscopy. Hydrogenated samples were prepared at\ntemperatures between 800 deg C and 955 deg C at 2 kbar total pressure. Hydrogen\nfugacities (f_{H_2}) were controlled using the double capsule technique with\nthe iron-w\\\"ustite (IW) buffer assemblage generating f_{H_2} of 1290-1370 bars\ncorresponding to H_2 partial pressures (P_{H_2}) of 960-975 bars. We found that\nsilica glass hydrogenated under such conditions contains molecular hydrogen\n(H_2) in addition to SiH and SiOH groups. H_2 molecules dissolved in the\nquenched glasses introduce a band at 4136 cm^{-1} in the Raman spectra which in\ncomparison to that of gaseous H_2 is wider and is shifted to lower frequency.\nIR spectra of hydrogenated samples contain a band at 4138 cm^{-1} which we\nassign to the stretching vibration of H_2 molecules located in\nnon-centrosymmetric sites. The Raman and IR spectra indicate that the dissolved\nH_2 molecules interact with the silicate network. We suggest that the H_2 band\nis the envelope of at least three components due to the occupation of at least\nthree different interstitial sites by H_2 molecules. Both, Raman and IR spectra\nof hydrogenated glasses contain bands at ~2255 cm^{-1} which may be due to the\nvibration of SiH groups.",
"arxiv_id": "physics/0608311",
"authors": [
"Burkhard C. Schmidt",
"Fran\u00e7ois Holtz",
"Jean-Michel B\u00e9ny"
],
"categories": [
"physics.geo-ph"
],
"doi": "10.1016/S0022-3093(98)00698-X",
"journal_ref": "Journal of Non Crystalline Solids 240 (1998) 91-103",
"title": "Incorporation of H_2 in vitreous silica, qualitative and quantitative determination from Raman and infrared spectroscopy",
"url": "https://arxiv.org/abs/physics/0608311"
},
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