Surface studies of TiO2SiO2 glasses by X-ray photoelectron spectroscopy

Sharmila M. Mukhopadhayay, Steve Garofalini

Research output: Contribution to journalArticle

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Abstract

The near-surface chemistry of titania-doped silicate glasses using X-ray photoelectron spectroscopy (XPS) has been investigated. It has been found that the Ti(2p) photoelectrons from these glasses have distinctly higher binding energy than those from pure titania (rutile) even though Ti has the same oxidation state in both solids. This difference has been attributed to differing oxygen co-ordinations, as previously shown by X-ray, infrared and Raman spectroscopic studies. This finding will be useful for future analysis of TiO systems. The oxygen 1s is peak has been successfully resolved into two components: one from SiOSi as in fused silica and the other from SiOTi, based on a four-coordinated Ti model. Silicon was found to be preferentially etched by ion bombardment, leaving a Ti-rich surface. High temperature annealing of both ion-etched and freshly cut samples led to substantial depletion of Ti from the near-surface region indicating that at the surface where the network is disrupted, occupancy by Ti is energetically less favored than by Si. This surface segregation phenomenon may have a major effect on the surface properties of these glasses.

Original languageEnglish
Pages (from-to)202-208
Number of pages7
JournalJournal of Non-Crystalline Solids
Volume126
Issue number3
DOIs
Publication statusPublished - Dec 2 1990

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X ray photoelectron spectroscopy
photoelectron spectroscopy
Glass
glass
Titanium
Oxygen
Surface segregation
Silicates
x rays
Silicon
Fused silica
Ion bombardment
Photoelectrons
Surface chemistry
Binding energy
titanium
Surface properties
Annealing
Ions
Infrared radiation

ASJC Scopus subject areas

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials

Cite this

Surface studies of TiO2SiO2 glasses by X-ray photoelectron spectroscopy. / Mukhopadhayay, Sharmila M.; Garofalini, Steve.

In: Journal of Non-Crystalline Solids, Vol. 126, No. 3, 02.12.1990, p. 202-208.

Research output: Contribution to journalArticle

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