Abstract
The alkali concentration in the surface monolayer of Na//2O multiplied by (times) 3SiO//2 and K//2O multiplied by (times) 3SiO//2 glasses was measured at elevated temperatures with ion scattering spectroscopy (ISS). At temperatures in and below the glass transformation range, the surface composition was time-dependent. In general, the alkali was depleted in the surface monolayer due to evaporation; the alkali depletion at the surface increased with decreasing temperature. These data could be mathematically modeled in terms of a surface reaction (desorption) term and a diffusion term. At temperatures above the transformation range, the alkali concentration in the surface reached an apparent steady-state value which was about 90% of the bulk concentration. It is suggested that surface tension, surface stress and convection may also influence the high temperature surface composition.
| Original language | English (US) |
|---|---|
| Pages | 391-398 |
| Number of pages | 8 |
| State | Published - Dec 1 1986 |
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All Science Journal Classification (ASJC) codes
- Engineering(all)
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ALKALI SURFACE CONCENTRATION AT ELEVATED TEMPERATURES. / Kelso, John F.; Pantano, Carlo G.
1986. 391-398.Research output: Contribution to conference › Paper
TY - CONF
T1 - ALKALI SURFACE CONCENTRATION AT ELEVATED TEMPERATURES.
AU - Kelso, John F.
AU - Pantano, Carlo G.
PY - 1986/12/1
Y1 - 1986/12/1
N2 - The alkali concentration in the surface monolayer of Na//2O multiplied by (times) 3SiO//2 and K//2O multiplied by (times) 3SiO//2 glasses was measured at elevated temperatures with ion scattering spectroscopy (ISS). At temperatures in and below the glass transformation range, the surface composition was time-dependent. In general, the alkali was depleted in the surface monolayer due to evaporation; the alkali depletion at the surface increased with decreasing temperature. These data could be mathematically modeled in terms of a surface reaction (desorption) term and a diffusion term. At temperatures above the transformation range, the alkali concentration in the surface reached an apparent steady-state value which was about 90% of the bulk concentration. It is suggested that surface tension, surface stress and convection may also influence the high temperature surface composition.
AB - The alkali concentration in the surface monolayer of Na//2O multiplied by (times) 3SiO//2 and K//2O multiplied by (times) 3SiO//2 glasses was measured at elevated temperatures with ion scattering spectroscopy (ISS). At temperatures in and below the glass transformation range, the surface composition was time-dependent. In general, the alkali was depleted in the surface monolayer due to evaporation; the alkali depletion at the surface increased with decreasing temperature. These data could be mathematically modeled in terms of a surface reaction (desorption) term and a diffusion term. At temperatures above the transformation range, the alkali concentration in the surface reached an apparent steady-state value which was about 90% of the bulk concentration. It is suggested that surface tension, surface stress and convection may also influence the high temperature surface composition.
UR - http://www.scopus.com/inward/record.url?scp=0022957603&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0022957603&partnerID=8YFLogxK
M3 - Paper
AN - SCOPUS:0022957603
SP - 391
EP - 398
ER -