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Electron Irradiation and Electron Tomography Studies of Glasses and Glass Nanocomposites

Published online by Cambridge University Press:  01 February 2011

G. Möbus ,
G. Yang ,
Z. Saghi ,
X. Xu ,
R.J. Hand ,
A. Pankov  and
M.I. Ojovan
G. Möbus
Affiliation:
Immobilisation Science Laboratory, Department of Engineering Materials, University of Sheffield, Sheffield, S1 3JD, UK
G. Yang
Affiliation:
Immobilisation Science Laboratory, Department of Engineering Materials, University of Sheffield, Sheffield, S1 3JD, UK
Z. Saghi
Affiliation:
Immobilisation Science Laboratory, Department of Engineering Materials, University of Sheffield, Sheffield, S1 3JD, UK
X. Xu
Affiliation:
Immobilisation Science Laboratory, Department of Engineering Materials, University of Sheffield, Sheffield, S1 3JD, UK
R.J. Hand
Affiliation:
Immobilisation Science Laboratory, Department of Engineering Materials, University of Sheffield, Sheffield, S1 3JD, UK
A. Pankov
Affiliation:
Immobilisation Science Laboratory, Department of Engineering Materials, University of Sheffield, Sheffield, S1 3JD, UK
M.I. Ojovan
Affiliation:
Immobilisation Science Laboratory, Department of Engineering Materials, University of Sheffield, Sheffield, S1 3JD, UK
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Abstract

Characterization of glasses and glass nanocomposites using modern transmission electron microscopy techniques is demonstrated. Techniques used include: (i) high-angle-annular dark field STEM for imaging of nanocomposites, (ii) electron tomography for 3D reconstruction and quantification of nanoparticle volume fractions, and (iii) fine structure electron energy loss spectroscopy for evaluation of boron coordination. Precipitation of CeO2 nanoparticles in borosilicate glasses is examined as a function of glass composition and redox partner elements. A large increase in the solubility of Ce is found for compositions where Ce retains +IV valence in the glass. Irradiation experiments with electrons and λ-rays are summarized and the degree of damage is compared by using changes in the boron K-edge fine structure, which allows the gradual transition from BO4 to BO3 coordination to be followed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1107: Scientific Basis for Nuclear Waste Management XXXI , 2008 , 239
Copyright
Copyright © Materials Research Society 2008

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