Authors:
C. Hugenschmidt Institut für Anorganische Chemie der Universität Bonn D-53115 Bonn (Germany)

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U. Holzwarth Institut für Strahlen-und Kernphysik der Universität Bonn D-53115 Bonn (Germany)

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M. Jansen Institut für Anorganische Chemie der Universität Bonn D-53115 Bonn (Germany)

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S. Kohn Institut für Anorganische Chemie der Universität Bonn D-53115 Bonn (Germany)

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K. Maier Institut für Strahlen-und Kernphysik der Universität Bonn D-53115 Bonn (Germany)

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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.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)