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Experimental findings in support of atomic transport of hydrogen in silica
KTH, Superseded Departments, Materials Science and Engineering.
2003 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 94, no 8, 4819-4823 p.Article in journal (Refereed) Published
Abstract [en]

Data supporting a view of both molecular and atomic transport of hydrogen in quartz is presented. By studying isotopic equilibration, it is shown that virtually all of the molecules diffusing through a 1.5 mm thick quartz membrane at 900 degreesC have undergone dissociation. The catalytic properties of platinum for the dissociation of H-2 are used to increase the surface concentration of atomic hydrogen on a quartz membrane. It is found that the high surface concentration increases the total flux of hydrogen through the membrane. It is also found by comparison with literature data that diatomic molecules probably diffuse in two modes in quartz. We suggest that these two modes are one atomic and one molecular.

Place, publisher, year, edition, pages
2003. Vol. 94, no 8, 4819-4823 p.
Keyword [en]
vitreous silica, si-sio2 interface, fused quartz, diffusion, hydroxyl, deuterium, exchange, kinetics, oxygen
URN: urn:nbn:se:kth:diva-22858DOI: 10.1063/1.1603350ISI: 000185664300012OAI: diva2:341556
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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