Issue 77, 2017

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

Abstract

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)

Supplementary files

Article information

Article type
Paper
Submitted
22 Aug 2017
Accepted
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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