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High-temperature breakdown of the synthetic iodine analogue of vanadinite, Pb5(VO4)3I: an apatite-related compound for iodine radioisotope immobilization?

Published online by Cambridge University Press:  05 July 2018

S. A. T. Redfern ,
S. E. Smith  and
E. R. Maddrell
S. A. T. Redfern*
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
S. E. Smith
Affiliation:
Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK
E. R. Maddrell
Affiliation:
National Nuclear Laboratory, Sellafield, Seascale, Cumbria CA20 1PG, UK
*
*E-mail: satr@cam.ac.uk
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Abstract

The thermal stability of the synthetic iodine analogue of vanadinite, Pb5(VO4)3I, in air has been investigated by in situ high temperature X-ray powder diffraction between 300 and 1070 K. Rietveld refinement of phase fractions shows that breakdown to lead orthovanadate, Pb3(VO4)2, begins at temperatures above 540 K, with complete loss of iodine above 680 K. More than 50 K below the onset of breakdown, the unit-cell parameters of Pb5(VO4)3I show anomalous contraction in the crystallographic x–y plane (reduction of a) which we associate with movement of iodine within the [0001] channels of the structure. The implications of these results for immobilization of 129I in potential apatite-related crystalline radioactive waste forms are discussed.

Keywords

iodine analogue of vanadiniteiodine immobilizationradioactive waste managementhigh temperature X-ray powder diffraction
Type
Research Article
Information
Mineralogical Magazine , Volume 76 , Issue 4 , August 2012 , pp. 997 - 1003
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2012

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