Diffusivity, Solubility and Speciation of Sulphur in Silicate Melts |
| Journal |
Advances in Science and Technology (Volume 46) |
| Volume |
Mass and Charge Transport in Inorganic Materials III |
| Edited by |
P. VINCENZINI and V. BUSCAGLIA |
| Pages |
93-97 |
| DOI |
10.4028/www.scientific.net/AST.46.93 |
| Online since |
October, 2006 |
| Authors |
J. Stelling,
Harald Behrens,
Joachim Deubener,
Stefan Mangold,
Joerg Goettlicher
|
| Keywords |
Diffusion, Silicate Melts, Solubility, Speciation, Sulphur, Technical Glasses |
| Abstract |
Diffusion and solubility of sulphur have important effects on the degassing of silicate
melts. Both properties are closely related to the structural incorporation of sulphur in the melt.
Depending on the oxygen fugacity, sulphur can be present as sulphide (S2-), sulphite (S4+) or
sulphate (S6+). Sulphates play an important role in the industrial production of glasses especially in
the fining process. The decomposition products of sulphate amass in bubbles which ascend and
homogenize the melt. Structural incorporation of sulphur in glasses is studied by XANES (X-ray
Absorption Near Edge Spectroscopy). Diffusion of sulphur is investigated in simple silicate systems
using the diffusion couple technique. First diffusion profiles were measured in sodium trisilicate
glasses by electron microprobe. The results indicate that sulphur diffusivity in high temperature
melts is close to the Eyring diffusivity calculated from viscosity data. |
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