Surface layer formation due to leaching and heat treatment of alkali lead silicate glass

A. D'Souza, C. G. Pantano

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The surface layer formed after leaching and subsequent heat treatment of an alkali lead silicate glass was studied. The glass was leached in 1 N HCl solution and subsequently heat treated in vacuum at 525°C. The surface was characterised with secondary ion mass spectrometry (SIMS) and the leachate solution was analysed by spectrochemical methods. The leaching kinetics of Pb were found to follow a t1/2 dependence for short times, indicating an interdiffusion mechanism between Pb2+ and H3O+ ions. For longer times the leaching rate of Pb showed a linear dependence with time. This was attributed to the formation of a hydrated gel like SiO2 rich layer at the surface of the glass in which ions have a very high mobility similar to that of ions in solution. Heat treatments of the leached glass in vacuum resulted in preferential segregation of alkali into the leached surface layer. However, the heat treated surface was resistant to further leaching of lead indicating densification of the SiO2 gel layer.

Original languageEnglish (US)
Pages (from-to)79-83
Number of pages5
JournalPhysics and Chemistry of Glasses
Volume37
Issue number3
StatePublished - Dec 1 1996

Fingerprint

Alkalies
leaching
Leaching
Silicates
alkalies
silicates
surface layers
heat treatment
Heat treatment
Glass
glass
Ions
gels
heat
Gels
vacuum
ions
Vacuum
densification
secondary ion mass spectrometry

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Physical and Theoretical Chemistry

Cite this

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abstract = "The surface layer formed after leaching and subsequent heat treatment of an alkali lead silicate glass was studied. The glass was leached in 1 N HCl solution and subsequently heat treated in vacuum at 525°C. The surface was characterised with secondary ion mass spectrometry (SIMS) and the leachate solution was analysed by spectrochemical methods. The leaching kinetics of Pb were found to follow a t1/2 dependence for short times, indicating an interdiffusion mechanism between Pb2+ and H3O+ ions. For longer times the leaching rate of Pb showed a linear dependence with time. This was attributed to the formation of a hydrated gel like SiO2 rich layer at the surface of the glass in which ions have a very high mobility similar to that of ions in solution. Heat treatments of the leached glass in vacuum resulted in preferential segregation of alkali into the leached surface layer. However, the heat treated surface was resistant to further leaching of lead indicating densification of the SiO2 gel layer.",
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Surface layer formation due to leaching and heat treatment of alkali lead silicate glass. / D'Souza, A.; Pantano, C. G.

In: Physics and Chemistry of Glasses, Vol. 37, No. 3, 01.12.1996, p. 79-83.

Research output: Contribution to journalArticle

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