Issue 77, 2017

On the existence of AgM9(VO4)6I (M = Ba, Pb)


The syntheses of the reported compounds AgM9(VO4)6I (M = Ba, Pb) were reinvestigated. Stoichiometric amounts of AgI with either M3(VO4)2 (M = Ba, Pb) or PbO and V2O5 were reacted in the solid-state at elevated temperatures in air or in flame-sealed quartz vessels. The resulting products were characterized by X-ray diffraction, scanning electron microscopy with energy dispersive X-ray analysis, and thermal analyses. Results show that, for all reaction conditions, the target AgM9(VO4)6I (M = Ba, Pb) phases could not be isolated. Instead, heterogeneous phase distributions of primarily M3(VO4)2 (M = Ba, Pb) and AgI were obtained. These findings demonstrate that AgI incorporation into single phase, iodine-deficient apatite derivatives for the immobilization of iodine-129 are not feasible under such conditions. This conclusion is important for the conditioning of iodine-129 in advanced reprocessing flowsheets, where iodine is typically sequestered as AgI.

Graphical abstract: On the existence of AgM9(VO4)6I (M = Ba, Pb)

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Article information

Article type
22 Aug 2017
04 Oct 2017
First published
17 Oct 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 49004-49009

On the existence of AgM9(VO4)6I (M = Ba, Pb)

E. V. Johnstone, D. J. Bailey, M. C. Stennett, J. Heo and N. C. Hyatt, RSC Adv., 2017, 7, 49004 DOI: 10.1039/C7RA09313F

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