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Preliminary investigation of chlorine speciation in zirconolite glass-ceramics for plutonium residues by analysis of Cl K-edge XANES

  • Amber R. Mason (a1), Stephanie M. Thornber (a1), Martin C. Stennett (a1), Laura J. Gardner (a1), Dirk Lützenkirchen-Hecht (a2) and Neil C. Hyatt (a1)...

Abstract

A zirconolite glass-ceramic material is a candidate wasteform for immobilisation of chlorine contaminated plutonium residues, in which plutonium and chlorine are partitioned to the zirconolite and aluminosilicate glass phase, respectively. A preliminary investigation of chlorine speciation was undertaken by analysis of Cl K-edge X-ray Absorption Near Edge Spectroscopy (XANES), to understand the incorporation mechanism. Cl was found to be speciated as the Cl- anion within the glass phase, according to the characteristic chemical shift of the X-ray absorption edge. By comparison with Cl K-edge XANES data acquired from reference compounds, the local environment of the Cl- anion is most closely approximated by the mineral marialite, in which Cl is co-ordinate to 4 x Na and/or Ca atoms.

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Keywords

Preliminary investigation of chlorine speciation in zirconolite glass-ceramics for plutonium residues by analysis of Cl K-edge XANES

  • Amber R. Mason (a1), Stephanie M. Thornber (a1), Martin C. Stennett (a1), Laura J. Gardner (a1), Dirk Lützenkirchen-Hecht (a2) and Neil C. Hyatt (a1)...

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