Imperial College London

Professor WE (Bill) Lee FREng

Faculty of EngineeringInstitute for Security Science & Technology

Co-Director of Institute for Security Science and Technology
 
 
 
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Contact

 

+44 (0)20 7594 6733w.e.lee Website

 
 
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Assistant

 

Ms Denise McGurk +44 (0)20 7594 8864

 
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Location

 

Central LibrarySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Stennett:2006,
author = {Stennett, MC and Hyatt, NC and Lee, WE and Maddrell, ER},
journal = {Ceramic Transactions},
pages = {81--90},
title = {Processing and characterisation of fluorite-related ceramic wasteforms for immobilisation of actinides},
volume = {176},
year = {2006}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - A number of possible options have been proposed for the encapsulation and immobilisation of long lived actinide (Act) fractions in nuclear waste. Current research on the fabrication of dense, durable crystalline matrices for the safe disposal of fissile plutonium is presented here. In this work three candidate ceramic matrices were investigated: a defect fluorite-structured cubic zirconia, (Zr0.85Y0.15O1.93)0.9(CeO 2)0.1; a pyrochlore, Gd2Zr 1.60Ce0.20Hf0.20O7; and a zirconolite, (Ca0.90Gd0.10)(Zr0.50Ce 0.20Hf0.20Gd0.10)Ti2O7. Homogeneous blends of the ceramic matrix formers and neutron absorbers (gadolinium and hafnium) were produced using a wet milling stage. A dry stage was employed to mix the CeO2 plutonium surrogate with the ceramic matrix formers, analogous to that anticipated for the fabrication of real wasteforms using PuO2. The aim of this study was to compile a matrix of data to enable comparison of the relative merits and drawbacks of various processing routes for each candidate wasteform. An experimental matrix was constructed to investigate the density, phase morphology and microstructure as a function of sintering temperature, time, and consolidation technique, for each target composition. Phase assemblage was examined using X-ray Diffraction (XRD) and Energy Dispersive Spectroscopy (EDS) and the phase morphology by Scanning Electron Microscopy (SEM).
AU - Stennett,MC
AU - Hyatt,NC
AU - Lee,WE
AU - Maddrell,ER
EP - 90
PY - 2006///
SN - 1042-1122
SP - 81
TI - Processing and characterisation of fluorite-related ceramic wasteforms for immobilisation of actinides
T2 - Ceramic Transactions
VL - 176
ER -