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f-Element Influence on the Size of Nanophase Phosphate Inclusions in Silica

Published online by Cambridge University Press:  01 February 2011

James V. Beitz ,
S. Skanthakumar ,
S. Seifert  and
P. Thiyagarajan
James V. Beitz
Affiliation:
Chemistry Division, National Laboratory, Argonne, IL 60439–4831, USA
S. Skanthakumar
Affiliation:
Chemistry Division, National Laboratory, Argonne, IL 60439–4831, USA
S. Seifert
Affiliation:
Advanced Photon Source, National Laboratory, Argonne, IL 60439–4831, USA
P. Thiyagarajan
Affiliation:
Intense Pulsed Neutron Source, Argonne, National Laboratory, Argonne, IL 60439–4831, USA
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Abstract

Insight into the factors that control the formation and size of heavy metal phosphate nanophases in vitreous silica has been gained by combining conventional and anomalous small angle x-ray scattering studies with powder x-ray diffraction and laser-induced fluorescence investigations. Europium, thorium, and uranyl ions were sorbed from aqueous solutions into a chemically functionalized porous silica (termed Diphosil). Aliquots of those samples were heated to a series of temperatures that spanned the pore collapse point. Loading with trivalent europium ions resulted in production of nanophases whose size corresponded to the average number of metal ions per pore. Thorium or uranyl ions resulted in retention of porosity to higher temperature with eventual pore collapse that evidently resulted in formation of nanophases whose size exceeded that determinable under the experimental conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 802: Symposium DD – Actinides - Basic Science, Applications, and Technology , 2003 , DD3.9
Copyright
Copyright © Materials Research Society 2004

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References

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