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Structure of Pd–Te precipitates in a simulated high-level nuclear waste glass

Published online by Cambridge University Press:  31 January 2011

L. Galoisy ,
G. Calas ,
G. Morin ,
S. Pugnet  and
C. Fillet
L. Galoisy
Affiliation:
Laboratoire de Minéralogie-Cristallographie, URA CNRS 09, Universités de Paris VI et VII et IPGP, 4 place Jussieu 75251 Paris Cedex 05, France
G. Calas
Affiliation:
Laboratoire de Minéralogie-Cristallographie, URA CNRS 09, Universités de Paris VI et VII et IPGP, 4 place Jussieu 75251 Paris Cedex 05, France
G. Morin
Affiliation:
Laboratoire de Minéralogie-Cristallographie, URA CNRS 09, Universités de Paris VI et VII et IPGP, 4 place Jussieu 75251 Paris Cedex 05, France
S. Pugnet
Affiliation:
Centre de Recherches Nucléaires de la Vallée du Rhône, CEA DCC/DRDD/SCD BP 171, F 30 205 Bagnols sur Cèze, France
C. Fillet
Affiliation:
Centre de Recherches Nucléaires de la Vallée du Rhône, CEA DCC/DRDD/SCD BP 171, F 30 205 Bagnols sur Cèze, France
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Abstract

Structural and bonding characteristics of simplified (Pd, Te) precipitates have been determined in a simulated nuclear French glass using extended x-ray absorption fine structure (EXAFS) and x-ray diffraction. In this sample, these precipitates have a homogeneous composition, with about 10 wt.% Te. They retain a face-centered cubic structure as in pure Pd with a cell parameter which obeys Vegard's law. Pd K-edge EXAFS shows the presence of Te in the Pd coordination shell, with (Pd–Te) distances of 2.80 Å. These distances, higher by 0.05 Å than the (Pd–Pd) distances, may result in a lower packing efficiency of the CFC lattice. The comparison with the average distances derived from x-ray diffraction shows the nonmetallic character of the Pd–Te bond in these precipitates. These bonding modifications may cause the limited solubility of Te in metallic Pd.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 5 , May 1998 , pp. 1124 - 1127
Copyright
Copyright © Materials Research Society 1998

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