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Point Defects and Microstructural Stability of Glasses Under Irradiation

Published online by Cambridge University Press:  15 February 2011

Marcello Antonini ,
Samuel N. Buckley ,
Paolo Camagni ,
Peter N. Gibson  and
Adriano Manara
Marcello Antonini
Affiliation:
* GNSM and Istituto di Fisica dell'Università, 41100 Modena, Italy
Samuel N. Buckley
Affiliation:
+ AERE, Harwell, OX11 ORA, Harwell, Oxon, England
Paolo Camagni
Affiliation:
° Joint Research Center, 21020 Ispra, Italy
Peter N. Gibson
Affiliation:
° Joint Research Center, 21020 Ispra, Italy
Adriano Manara
Affiliation:
° Joint Research Center, 21020 Ispra, Italy
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Abstract

The results of previous optical absorption experiments aiming to investigate the behaviour of atomic defects in silica based glasses irradiated with various types of particles have been extended to examine the effects of multiple irradiations which take place during long term storage of glasses containing HLW. In addition, point defect clustering phenomena have been investigated by means of high voltage transmission electron microscopy. It has been found that due to the large number of defects already present in amorphous silica prior to irradiations, the contributions of different bombarding particles to the total damage cannot be considered fully additive in terms of the relative number of displaced atoms, but some consideration has to be made of defect interactions and ionization damage. Clustering effects, while being absent in pure silica, are present in borosilicates at large dose rates (≳1022 electrons m−2 sec−1 ). At lower beam current densities and doses comparable to those achieved after 10–100 years of HLW storage, phase separation into a microcrystalline compound has been detected by transmission electron microscopy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 6: Symposium D – Scientific Basis for Nuclear Waste Management IV , 1981 , 709
Copyright
Copyright © Materials Research Society 1982

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References

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