ALKALI SURFACE CONCENTRATION AT ELEVATED TEMPERATURES.

John F. Kelso, Carlo G. Pantano

Research output: Contribution to conferencePaper

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 languageEnglish (US)
Pages391-398
Number of pages8
StatePublished - Dec 1 1986

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Surface structure
Monolayers
Temperature
Glass
Surface reactions
Surface tension
Desorption
Evaporation
Spectroscopy
Scattering
Ions
Convection

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Kelso, J. F., & Pantano, C. G. (1986). ALKALI SURFACE CONCENTRATION AT ELEVATED TEMPERATURES.. 391-398.
Kelso, John F. ; Pantano, Carlo G. / ALKALI SURFACE CONCENTRATION AT ELEVATED TEMPERATURES. 8 p.
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Kelso, JF & Pantano, CG 1986, 'ALKALI SURFACE CONCENTRATION AT ELEVATED TEMPERATURES.', pp. 391-398.

ALKALI SURFACE CONCENTRATION AT ELEVATED TEMPERATURES. / Kelso, John F.; Pantano, Carlo G.

1986. 391-398.

Research output: Contribution to conferencePaper

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