Journal of Radioanalytical and Nuclear Chemistry

, Volume 210, Issue 2, pp 583–589 | Cite as

Studies of crystallization of SiO2-glass by positron annihilation

  • C. Hugenschmidt
  • U. Holzwarth
  • M. Jansen
  • S. Kohn
  • K. Maier
Contributed Papers
  • 28 Downloads

Abstract

The crystallization of silica glass has been studied by positron lifetime spectroscopy and accompanying investigations using X-ray diffraction and nuclear magnetic resonance (NMR). To this end isothermal and isochronal heat treatments were performed in the range from 700 °C up to 1600 °C. The lifetime spectra are analyzed by two lifetime components. The decrease of the short lifetime (200 ps) is attributed to the increasing volume fraction of the crystalline phase. The long lifetime (1000 ps) is related with the pick-off annihilation of theo-Ps states in cavities.With starting formation of crystallization nuclei the long lifetime increases which is explained by expanding cavities at the interface between crystalline phase and amorphous matrix.

Keywords

Crystallization Heat Treatment Nuclear Magnetic Resonance Crystalline Phase Silica Glass 

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Copyright information

© Akadémiai Kiadó 1996

Authors and Affiliations

  • C. Hugenschmidt
    • 2
  • U. Holzwarth
    • 1
  • M. Jansen
    • 2
  • S. Kohn
    • 2
  • K. Maier
    • 1
  1. 1.Institut für Strahlen-und Kernphysik der Universität BonnBonn(Germany)
  2. 2.Institut für Anorganische Chemie der Universität BonnBonn(Germany)

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