CASSINGHAM, N.J., STENNETT, M.C., BINGHAM, Paul, AQUILANTI, G. and HYATT, N.C. (2010). The role of Zn in model nuclear waste glasses studied by XAS. In: Diamond '10 Conference - Decommissioning, Immobilisation and Management of, Manchester, UK, 15-16 December 2010. [Conference or Workshop Item]
Abstract
It has been suggested that small additions of zinc increases the durability of oxide glasses of interest for
radioactive waste immobilisation. However, the structural environment of Zn in such glasses is not fully
understood. To understand the mechanisms by which Zn increases glass durability, a suite of Zn doped
model silicate glasses was investigated by Zn K-edge X-ray absorption spectroscopy (XAS) together with a
mineral specimen of hemimorphite - Zn4Si2O7(OH)2·H2O and a simulant UK HLW glass. Fitting of XAS data
from the mineral standard permitted reliable determination of four-fold co-ordinate Zn in the model and
simulant HLW glasses. XAS data show evidence of intermediate range order, in FT χ(k) plots, consistent
with Zn-O-Si linkages in all glasses. Thus, Zn is understood to adopt a network intermediate role in model
and simulant HLW silicate glasses.
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