Intricate disorder in defect fluorite/pyrochlore: a concord of chemistry and crystallography.

Autor: Simeone D; DEN/Service de Recherches Metallurgiques Appliquees, CEA, Universite Paris-Saclay, F-91191, Centralesupelec/SPMS/UMR-8085/LRC CARMEN, 92292, Chatenay Malabry, France. david.simeone@cea.fr., Thorogood GJ; ANSTO, Lucas Heights, NSW, Australia.; Department of Nuclear System Safety Engineering, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka, 940-2188, Japan., Huo D; LEEL, NIMBE, CEA/CNRS, Universite Paris Saclay, 91191, Gif sur, Yvette, France., Luneville L; DEN/Service d'Etude et de Recherches en Mathematiques Appliquees, CEA, Universite Paris-Saclay, F-91191, Centralesupelec/SPMS/UMR-8085/LRC CARMEN, 92292, Chatenay Malabry, France., Baldinozzi G; DEN/Service de Recherches Metallurgiques Appliquees, CEA, Universite Paris-Saclay, F-91191, Centralesupelec/SPMS/UMR-8085/LRC CARMEN, 92292, Chatenay Malabry, France., Petricek V; Institute of Physics ASCR, v.v.i., Na Slovance 2, Prague, Czech Republic., Porcher F; Laboratoire Leon Brillouin, CEA/CNRS Universite Paris Saclay, 91191, Gif sur Yvette, France., Ribis J; DEN/Service de Recherches Metallurgiques Appliquees, CEA, Universite Paris-Saclay, F-91191, Centralesupelec/SPMS/UMR-8085/LRC CARMEN, 92292, Chatenay Malabry, France., Mazerolles L; Institut de Chimie et des Materiaux CNRS UMR 7182, Universite Paris Est, 2-8 Rue Henri Dunant, F-94407, Vitry Sur Seine, France., Largeau L; C2N/CNRS-Universite Paris-Saclay, Route de Nozay, 91460, Marcoussis, France., Berar JF; Institut Neel, CNRS/UJF UPR 2940, 25 rue des Martyrs BP166, 38042, Grenoble cedex 9, France., Surble S; LEEL, NIMBE, CEA/CNRS, Universite Paris Saclay, 91191, Gif sur, Yvette, France.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2017 Jun 16; Vol. 7 (1), pp. 3727. Date of Electronic Publication: 2017 Jun 16.
DOI: 10.1038/s41598-017-02787-w
Abstrakt: Intuitively scientists accept that order can emerge from disorder and a significant amount of effort has been devoted over many years to demonstrate this. In metallic alloys and oxides, disorder at the atomic scale is the result of occupation at equivalent atomic positions by different atoms which leads to the material exhibiting a fully random or modulated scattering pattern. This arrangement has a substantial influence on the material's properties, for example ionic conductivity. However it is generally accepted that oxides, such as defect fluorite as used for nuclear waste immobilization matrices and fuel cells, are the result of disorder at the atomic scale. To investigate how order at the atomic scale induces disorder at a larger scale length, we have applied different techniques to study the atomic composition of a homogeneous La 2 Zr 2 O 7 pyrochlore, a textbook example of such a structure. Here we demonstrate that a pyrochlore, which is considered to be defect fluorite, is the result of intricate disorder due to a random distribution of fully ordered nano-domains. Our investigation provides new insight into the order disorder transformations in complex materials with regards to domain formation, resulting in a concord of chemistry with crystallography illustrating that order can induce disorder.
Databáze: MEDLINE
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