Details
| Original language | English |
|---|---|
| Pages (from-to) | 2941-2948 |
| Number of pages | 8 |
| Journal | Journal of non-crystalline solids |
| Volume | 357 |
| Issue number | 15 |
| Early online date | 30 Apr 2011 |
| Publication status | Published - 15 Jul 2011 |
Abstract
The diffusivity of sulphur in nominal 10 Na2O-16 CaO-74 SiO 2 (NCS) and 26 Na2O-74 SiO2 (NS3) melts was investigated in the temperature range 1273-1473 K using the 35S radioactive isotope in a sandwich setup. Samples were sealed in platinum capsules and run with vertical alignment at 100 MPa confining pressure in an internally heated gas pressure vessel. Using the lowest diffusion coefficient D (m2 s- 1) for each temperature the Arrhenian relations logD = -(4.6 ± 0.3) - (216 ± 7) kJ mol- 1/RT for NCS and logD = -(6.3 ± 0.6) - (167 ± 17) kJ mol- 1/RT for NS3 were determined. Viscosity of the melts was used to test the applicability of the Stokes-Einstein (SE) and the Eyring (EY) equations to sulphur diffusion. The SE equation yields unrealistically low radii of the diffusing particles, a consequent of the non-molecular structure of the silicate melts. On the other hand, the Eyring relation yields reasonable jump distances of 550 pm (NCS) and 750 pm (NS3) by fitting the diffusion data to the EY equation. These large values imply that sulphate ions (ionic diameter = 290 pm) migrate as large entities through the silicate network.
Keywords
- Eyring equation, Silicate melt, Stokes-Einstein equation, Sulphur diffusion, Viscosity
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Materials Science(all)
- Ceramics and Composites
- Physics and Astronomy(all)
- Condensed Matter Physics
- Materials Science(all)
- Materials Chemistry
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In: Journal of non-crystalline solids, Vol. 357, No. 15, 15.07.2011, p. 2941-2948.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Diffusion of the 35S isotope in soda-lime-silica and sodium trisilicate glass melts
AU - Backnaes, Linda
AU - Deubener, Joachim
AU - Behrens, Harald
AU - Stelling, Jan
AU - Cichy, Sarah B.
AU - Bartels, Alexander
N1 - Funding Information: The financial support of the Deutsche Forschungsgemeinschaft (DFG) under the grants Be1720/16-1 and De598/13-2 is gratefully acknowledged.
PY - 2011/7/15
Y1 - 2011/7/15
N2 - The diffusivity of sulphur in nominal 10 Na2O-16 CaO-74 SiO 2 (NCS) and 26 Na2O-74 SiO2 (NS3) melts was investigated in the temperature range 1273-1473 K using the 35S radioactive isotope in a sandwich setup. Samples were sealed in platinum capsules and run with vertical alignment at 100 MPa confining pressure in an internally heated gas pressure vessel. Using the lowest diffusion coefficient D (m2 s- 1) for each temperature the Arrhenian relations logD = -(4.6 ± 0.3) - (216 ± 7) kJ mol- 1/RT for NCS and logD = -(6.3 ± 0.6) - (167 ± 17) kJ mol- 1/RT for NS3 were determined. Viscosity of the melts was used to test the applicability of the Stokes-Einstein (SE) and the Eyring (EY) equations to sulphur diffusion. The SE equation yields unrealistically low radii of the diffusing particles, a consequent of the non-molecular structure of the silicate melts. On the other hand, the Eyring relation yields reasonable jump distances of 550 pm (NCS) and 750 pm (NS3) by fitting the diffusion data to the EY equation. These large values imply that sulphate ions (ionic diameter = 290 pm) migrate as large entities through the silicate network.
AB - The diffusivity of sulphur in nominal 10 Na2O-16 CaO-74 SiO 2 (NCS) and 26 Na2O-74 SiO2 (NS3) melts was investigated in the temperature range 1273-1473 K using the 35S radioactive isotope in a sandwich setup. Samples were sealed in platinum capsules and run with vertical alignment at 100 MPa confining pressure in an internally heated gas pressure vessel. Using the lowest diffusion coefficient D (m2 s- 1) for each temperature the Arrhenian relations logD = -(4.6 ± 0.3) - (216 ± 7) kJ mol- 1/RT for NCS and logD = -(6.3 ± 0.6) - (167 ± 17) kJ mol- 1/RT for NS3 were determined. Viscosity of the melts was used to test the applicability of the Stokes-Einstein (SE) and the Eyring (EY) equations to sulphur diffusion. The SE equation yields unrealistically low radii of the diffusing particles, a consequent of the non-molecular structure of the silicate melts. On the other hand, the Eyring relation yields reasonable jump distances of 550 pm (NCS) and 750 pm (NS3) by fitting the diffusion data to the EY equation. These large values imply that sulphate ions (ionic diameter = 290 pm) migrate as large entities through the silicate network.
KW - Eyring equation
KW - Silicate melt
KW - Stokes-Einstein equation
KW - Sulphur diffusion
KW - Viscosity
UR - http://www.scopus.com/inward/record.url?scp=79958854090&partnerID=8YFLogxK
U2 - 10.1016/j.jnoncrysol.2011.03.037
DO - 10.1016/j.jnoncrysol.2011.03.037
M3 - Article
AN - SCOPUS:79958854090
VL - 357
SP - 2941
EP - 2948
JO - Journal of non-crystalline solids
JF - Journal of non-crystalline solids
SN - 0022-3093
IS - 15
ER -