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Effect of Molybdenum and Ruthenium on the Crystallization Tendency of a New Nuclear Glass Containing High Rare-earth Concentration

Published online by Cambridge University Press:  01 February 2011

Daniel Caurant ,
Nolwenn Chouard ,
Odile Majerus ,
Jean-Luc Dussossoy ,
Aurelien Ledieu ,
Sergey Klimin  and
Dmitry Pytalev
Daniel Caurant
Affiliation:
[email protected], CEA, Department of Nuclear Energy, Bagnols-sur-Ceze, France
Nolwenn Chouard
Affiliation:
[email protected], CNRS, ENSCP LCMCP, PARIS, France
Odile Majerus
Affiliation:
[email protected], CNRS, ENSCP LCMCP, PARIS, France
Jean-Luc Dussossoy
Affiliation:
[email protected], CEA, Department of Nuclear Energy, Bagnols-sur-Ceze, France
Aurelien Ledieu
Affiliation:
[email protected], CEA, Department of Nuclear Energy, Bagnols-sur-Ceze, France
Sergey Klimin
Affiliation:
[email protected], Academy of Sciences, Institut of spectroscopy of Troitsk, Troitsk (Moscow region), Russian Federation
Dmitry Pytalev
Affiliation:
[email protected], Academy of Sciences, Institut of spectroscopy of Troitsk, Troitsk (Moscow region), Russian Federation
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Abstract

The impact of Nd2O3, MoO3 and RuO2 addition on the competition between the crystallization of apatite Ca2Nd8(SiO4)6O2 and powellite CaMoO4 phases which both may appear in High Level Waste nuclear glass (under certain specific conditions of cooling and glass composition) has been studied on a simplified composition belonging to the system SiO2-Na2O-CaO-Al2O3-B2O3. X-ray diffraction (at room temperature and high temperature) and scanning electron microscopy measurements have been performed on five glasses under two different thermal treatments. We show that RuO2 acts as a nucleating agent for apatite. Moreover, neodymium and molybdenum cations seem to be very close in the glassy network as Nd2O3 addition stops the phase separation of molybdates and inhibits the crystallization of CaMoO4. On the contrary, MoO3 seems to favor the crystallization of apatite. For several samples, the evolution of the distribution of Nd3+ cations after crystallization was followed by optical absorption spectroscopy.

Keywords

nucleation & growthwaste managementamorphous
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1265: Symposium AA – Scientific Basis for Nuclear Waste Management XXXIV , 2010 , 1265-AA06-12
Copyright
Copyright © Materials Research Society 2010

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References

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