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{
"USGS Publications Warehouse": { "@context": "https://schema.org", "@type": "Article", "additionalType": "Journal Article", "name": "Determination of diffusion coefficients of hydrogen in fused silica between 296 and 523 K by Raman spectroscopy and application of fused silica capillaries in studying redox reactions", "identifier": [ { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse IndexID", "value": "70036344", "url": "https://pubs.usgs.gov/publication/70036344" }, { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse Internal ID", "value": 70036344 }, { "@type": "PropertyValue", "propertyID": "DOI", "value": "10.1016/j.gca.2009.06.001", "url": "https://doi.org/10.1016/j.gca.2009.06.001" }, { "@type": "PropertyValue", "propertyID": "ISSN", "value": "00167037" } ], "journal": { "@type": "Periodical", "name": "Geochimica et Cosmochimica Acta", "volumeNumber": "73", "issueNumber": "18" }, "inLanguage": "en", "isPartOf": [ { "@type": "CreativeWorkSeries", "name": "Geochimica et Cosmochimica Acta" } ], "datePublished": "2009", "dateModified": "2017-10-24", "abstract": "Diffusion coefficients (D) of hydrogen in fused silica capillaries (FSC) were determined between 296 and 523\u00a0K by Raman spectroscopy using CO2\u00a0as an internal standard. FSC capsules (3.25\u00a0\u00d7\u00a010\u22124\u00a0m OD, 9.9\u00a0\u00d7\u00a010\u22125\u00a0m ID, and \u223c0.01\u00a0m long) containing CO2\u00a0and H2were prepared and the initial relative concentrations of hydrogen in these capsules were derived from the Raman peak-height ratios between H2\u00a0(near 587\u00a0cm\u22121) and CO2\u00a0(near 1387\u00a0cm\u22121). The sample capsules were then heated at a fixed temperature (T) at one atmosphere to let H2\u00a0diffuse out of the capsule, and the changes of hydrogen concentration were monitored by Raman spectroscopy after quench. This process was repeated using different heating durations at 296 (room\u00a0T), 323, 375, 430, 473, and 523\u00a0K; the same sample capsule was used repeatedly at each temperature. The values of\u00a0D\u00a0(in m2\u00a0s\u22121) in FSC were obtained by fitting the observed changes of hydrogen concentration in the FSC capsule to an equation based on Fick\u2019s law. Our\u00a0D\u00a0values are in good agreement with the more recent of the two previously reported experimental data sets, and both can be represented by:lnD=-(16.471\u00b10.035)-44589\u00b1139RT(R2=0.99991)where\u00a0R\u00a0is the gas constant (8.3145\u00a0J/mol\u00a0K),\u00a0T\u00a0in Kelvin, and errors at 1\u03c3\u00a0level. The slope corresponds to an activation energy of 44.59\u00a0\u00b1\u00a00.14\u00a0kJ/mol.The\u00a0D\u00a0in FSC determined at 296\u00a0K is about an order of magnitude higher than that in platinum at 723\u00a0K, indicating that FSC is a suitable membrane for hydrogen at temperature between 673\u00a0K and room temperature, and has a great potential for studying redox reactions at these temperatures, especially for systems containing organic material and/or sulphur.", "description": "9 p.", "publisher": { "@type": "Organization", "name": "Elsevier" }, "author": [ { "@type": "Person", "name": "Chou, I-Ming imchou@usgs.gov", "givenName": "I-Ming", "familyName": "Chou", "email": "imchou@usgs.gov", "identifier": { "@type": "PropertyValue", "propertyID": "ORCID", "value": "0000-0001-5233-6479", "url": "https://orcid.org/0000-0001-5233-6479" }, "affiliation": [ { "@type": "Organization", "name": "Eastern Mineral and Environmental Resources Science Center", "url": 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