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Hydrogen diffusion in silicate glasses |
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| Affiliation: | 1. Institute of Microelectronics and Optoelectronics, Warsaw University of Technology, Koszykowa 75, Warsaw 00-662, Poland;2. Centre de Recherche en Photonique, Université du Québec en Outaouais, 101 rue Saint-Jean-Bosco, Gatineau, J8X 3X7, Québec, Canada;3. Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, Warsaw 02-666, Poland;1. Department of Geology, University of Johannesburg, Auckland Park 2006, South Africa;2. ARC Centre of Excellence in Ore Deposits and School of Earth Sciences, University of Tasmania, Hobart, TAS 7001, Australia;3. Department of Geology and Geochemistry, Faculty of Earth and Life Sciences, VU University Amsterdam, 1085, 1081 HV Amsterdam, The Netherlands |
| Abstract: | The permeation of hydrogen into silver-doped glasses in the range 280–450°C is derived from spectrophotometric determinations of the rate of precipitation of colloidal silver. By measuring this rate as a function of hydrogen partial pressure the effect of the mobility of the silver ions may be allowed for and values obtained for the alkali ion-silver ion interdiffusion coefficient. The method is tested by adding various amounts of silver to the same base glass and comparing the values obtained for PH2 and DAg+. When Na+ is replaced by Ca++ in simple silicate glasses the hydrogen permeation rate is reduced in spite of the decrease in the number of network modifying ions. Substitution of Mg++ for Ca++ leads to an increase in the permeability while replacement of Ca++ by Sr++ or Ba++ causes a decrease. |
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