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First determination of dissolution rates of oriented UO2 single crystals

Published online by Cambridge University Press:  24 January 2020

S. BERTOLOTTO ,
S. SZENKNECT ,
S. LALLEMAN ,
R. PODOR ,
L. CLAPAREDE ,
A. MAGNALDO ,
P. RAISON ,
A. MESBAH ,
B. ARAB-CHAPELET  and
N. DACHEUX
S. BERTOLOTTO
Affiliation:
CEA, DEN, DMRC, Univ Montpellier, Marcoule, France ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule, BP 17171, 30207 Bagnols-Sur-Cèze cedex, France
S. SZENKNECT
Affiliation:
ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule, BP 17171, 30207 Bagnols-Sur-Cèze cedex, France
S. LALLEMAN
Affiliation:
ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule, BP 17171, 30207 Bagnols-Sur-Cèze cedex, France
R. PODOR
Affiliation:
ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule, BP 17171, 30207 Bagnols-Sur-Cèze cedex, France
L. CLAPAREDE
Affiliation:
ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule, BP 17171, 30207 Bagnols-Sur-Cèze cedex, France
A. MAGNALDO
Affiliation:
CEA, DEN, DMRC, Univ Montpellier, Marcoule, France
P. RAISON
Affiliation:
JRC Karlsruhe, 76344 Eggenstein-Leopoldshafen, Germany
A. MESBAH
Affiliation:
ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule, BP 17171, 30207 Bagnols-Sur-Cèze cedex, France
B. ARAB-CHAPELET
Affiliation:
CEA, DEN, DMRC, Univ Montpellier, Marcoule, France
N. DACHEUX*
Affiliation:
ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Site de Marcoule, BP 17171, 30207 Bagnols-Sur-Cèze cedex, France
*
*(Email: nicolas.dacheux@umontpellier.fr)
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Abstract:

Millimetre UO2 single crystals were cut and oriented at JRC Karlsruhe. The orientation of each face of the parallelepiped single crystals was determined with Laue diffraction and the corresponding surface area by geometric measurements. Then, the (111), (100), (110) faces of each single crystal were polished to optical grade and characterized by XRD in order to confirm the surface orientation. The dissolution of the three single crystals was achieved in nitric acid media under dynamic conditions, at room temperature. Two dissolution regimes were observed for all samples. The normalized dissolution rate measured in the first step was not influenced by the crystallographic orientation of the faces. However, during the second step, (110) oriented faces were found to dissolve 4 times faster than the (100) faces. One explanation could involve the atomic composition of each oriented surface in the fluorite-type structure

Keywords

ceramiccorrosioncrystallographic structuredefectsnuclear materials
Type
Articles
Information
MRS Advances , Volume 5 , Issue 1-2: Scientific Basis for Nuclear Waste Management XLIII , 2020 , pp. 19 - 26
Copyright
Copyright © Materials Research Society 2020

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