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Oxygen and phosphorus coordination around iron in crystalline ferric ferrous pyrophosphate and iron-phosphate glasses with UO2 or Na2O

Published online by Cambridge University Press:  31 January 2011

C. H. Booth ,
P. G. Allen ,
J. J. Bucher ,
N. M. Edelstein ,
D. K. Shuh ,
G. K. Marasinghe ,
M. Karabulut ,
C. S. Ray  and
D. E. Day
C. H. Booth*
Affiliation:
Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
P. G. Allen
Affiliation:
Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
J. J. Bucher
Affiliation:
Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
N. M. Edelstein
Affiliation:
Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
D. K. Shuh
Affiliation:
Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
G. K. Marasinghe
Affiliation:
Department of Physics, Department of Ceramic Engineering, and the Graduate Center for Materials Research, University of Missouri, Rolla, Missouri 65409
M. Karabulut
Affiliation:
Department of Physics, Department of Ceramic Engineering, and the Graduate Center for Materials Research, University of Missouri, Rolla, Missouri 65409
C. S. Ray
Affiliation:
Department of Physics, Department of Ceramic Engineering, and the Graduate Center for Materials Research, University of Missouri, Rolla, Missouri 65409
D. E. Day
Affiliation:
Department of Physics, Department of Ceramic Engineering, and the Graduate Center for Materials Research, University of Missouri, Rolla, Missouri 65409
*
a)Address all correspondence to this author. Present address: Los Alamos National Laboratory, MS K764, Los Alamos, New Mexico 87545. cbooth@lanl.gov
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Abstract

Fe K-edge x-ray absorption fine-structure (XAFS) measurements were performed on glass samples of (Fe3O4)0.3(P2O5)0.7 with various amounts of Na2O or UO2. Near-edge and extended XAFS regions are studied and comparisons are made to several reference compounds. We find that iron in the base glass is ∼25% divalent and that the Fe2+ coordination is predominantly octahedral, while Fe3+ sites are roughly split between tetrahedral and octahedral coordinations. Also, we measure roughly one Fe–O–P link per iron. Substitution of Na2O or UO2 up to 15 mol% primarily affects the first Fe–O shell. The results are compared to data from the related material Fe3(P2O7)2.

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Type
Articles
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Journal of Materials Research , Volume 14 , Issue 6 , June 1999 , pp. 2628 - 2639
Copyright
Copyright © Materials Research Society 1999

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References

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