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Can We Describe phase Transition in Insulators within the Landau PT theory Framework?

Published online by Cambridge University Press:  31 January 2011

David Simeone ,
Gianguido Baldinozzi ,
Dominique Gosset ,
Laurence Luneville  and
Léo Mazerolles
David Simeone
Affiliation:
david.simeone@cea.fr, CEA/DEN/DANS/DMN/SRMA/LA2M-MFE, Gif sur yvette, France
Gianguido Baldinozzi
Affiliation:
gb@ecp.fr, CNRS, Institut de Chimie/SPMS-ECP, gif sur yvette, France
Dominique Gosset
Affiliation:
dominique.gosset@cea.fr, CEA/DEN/DANS/DMN/SRMA/LA2M-MFE, Gif sur yvette, France
Laurence Luneville
Affiliation:
laurence.luneville@cea.fr, CEA/DEN/DANS/DM2S/SERMA/LLPR-MFE, gif sur yvette, France
Léo Mazerolles
Affiliation:
mazerolles@glvt-cnrs.fr, CNRS, Institut des Sciences Chimiques Seine Amont, thiais, France
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Abstract

Based on studies of simple oxides, this paper demonstrates that the specific energy deposition modes under irradiation induce modifications of materials over different length scales. On the other hand, we show the Landau phase transition theory, widely used to explain the structural stability of materials out of irradiation, can give a general framework to describe the behavior of these oxides under irradiation. The use of X-ray diffraction techniques coupled with the Raman spectroscopy allows defining in a quantitative way the phenomenological parameters leading to predictive results. This paper clearly shows that in two model systems, pure zirconia and spinels, no unexpected new phases are produced in these oxides irradiated at room temperature and with different fluxes. Such a phenomenological approach may be useful to study the radiation tolerance of many crystalline ceramics (e.g. the zirconium based americium ceramics).

Keywords

x-ray diffraction (XRD)radiation effectsphase transformation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1215: Symposium V – Materials Research Needs to Advance Nuclear Energy , 2009 , 1215-V02-01
Copyright
Copyright © Materials Research Society 2010

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