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Glace VII à hautes températures : preuve d'une nouvelle phase de H 2 O ou simple effet thermique ?, p.171 ,
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, Au cours de ce travail, notre ambition était d'étudier les diagrammes de phase de H 2 O et NH 3 afin d'améliorer notre connaissance de ces systèmes et de clarifier les courbes de fusion à haute température et haute pression de l'ammoniace (10 à 60 GPa et 1000 K à 2200 K) et de l'eau (20 à 90 GPa et 900 à 2400 K), 2013.
, La technique la plus adéquate pour une détection directe de la fusion est la diffraction des rayons X. Pour répondre aux objectifs, nous avons employé de nouveaux outils expérimentaux pour nous affranchir des contraintes liées à l'utilisation des cellules à enclumes de diamant, lors des expériences de diffraction X. En premier lieu, nous avons utilisé un collimateur multicanal
, Ce collimateur a également permis l'extraction d'informations quantitatives sur la structure de l'ammoniac. Le deuxième outil expérimental utilisé est un système de chauffage laser CO 2 . Il permet d'atteindre des températures supérieures à 3000 K et de chauffer directement NH 3 et H 2 O sans l'usage d'un absorbeur. L'absence de ce dernier limite les risques de contamination et de réaction chimique au sein de l'échantillon. Ces stratégies expérimentales ont rendu possible pour la première fois l'étude de la struc