Physics and Chemistry of Minerals

, Volume 21, Issue 8, pp 510–515 | Cite as

Pressure-induced coordination change of Ti in silicate glass: a XANES study

  • E. Paris
  • D. B. Dingwell
  • F. A. Seifert
  • A. Mottana
  • C. Romano


The effect of pressure on titanium coordination in glasses, with composition K2TiSi4O11, quenched isobarically from liquids equilibrated at high pressure (5, 10, 15, 20, 25, 30 kbar respectively) and T=1600° C has been investigated by X-ray absorption spectroscopy (XAS). The XANES spectra collected at the Ti K-edge clearly show a variation with pressure that is related to changes in the geometrical environment around the Ti atoms. By comparison with spectra of standard materials, the XANES spectra of the glasses suggest a relatively low average coordination number (near 5) in samples quenched at low pressure and a higher coordination number (near 6) in samples quenched from the highest pressure. The combination of XANES data with density and compressibility measurements supports the idea that a mixture of 6- and lower coordinated (4- and/ or 5-coordinated) Ti geometries are present in the 1 bar glass, and an increasing proportion of 6-coordinated Ti occurs in the glasses synthesized at progressively higher pressures.


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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • E. Paris
    • 1
  • D. B. Dingwell
    • 2
  • F. A. Seifert
    • 2
  • A. Mottana
    • 3
  • C. Romano
    • 2
  1. 1.Dipartimento di Scienze della TerraUniversita' di CamerinoCamerinoItaly
  2. 2.Bayerisches Geoinstitut, Universität BayreuthBayreuthGermany
  3. 3.Dipartimento di Scienze GeologicheTerza Universita' di RomaRomaItaly

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