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XAFS Study of Fe K Edge in Al2O3-B2O3-Fe2O3-Na2O-SiO2 Glasses

Published online by Cambridge University Press:  21 February 2013

S.V. Stefanovsky ,
A.A. Shiryaev ,
Y.V. Zubavichus ,
K.M. Fox  and
J.C. Marra
S.V. Stefanovsky
Affiliation:
SIA Radon, 7th Rostovskii lane 2/14, Moscow 119121 Russia, profstef@mtu-net.ru Institute of Physical Chemistry and Electrochemistry RAS, Leninskii av. 31, Moscow 119071 Russia
A.A. Shiryaev
Affiliation:
Institute of Physical Chemistry and Electrochemistry RAS, Leninskii av. 31, Moscow 119071 Russia
Y.V. Zubavichus
Affiliation:
NRC “Kurchatov Institute”, Kurchatov sq. 1 123182, Moscow 119117 Russia
K.M. Fox
Affiliation:
Savannah River National Laboratory, Building 773-A, Aiken 29808 U.S.A.
J.C. Marra
Affiliation:
Savannah River National Laboratory, Building 773-A, Aiken 29808 U.S.A.
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Abstract

Valence state and local environment of Fe in complex glasses related to the system Al2O3-B2O3-Fe2O3-Na2O-SiO2 were studied. In all the glasses, the major fraction of Fe exists as Fe3+ ions but a minor fraction of Fe2+ ions especially in the glass with the lowest K=[SiO2]/[B2O3] ratio was also present. Average Fe—O distance in the first shell is 1.80-1.85 Å and coordination number is 4-6. The intensity due to the second sphere is rather weak demonstrating homogeneous distribution of Fe ions in the glass.

Keywords

Feextended x-ray absorption fine structure(EXAFS)waste management

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Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1518: Symposium LL – Scientific Basis for Nuclear Waste Management XXXVI , 2012 , pp. 59 - 64
Copyright
Copyright © Materials Research Society 2013 

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References

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