Argon-neon binary diagram and ArNe2 Laves phase

Mixtures of argon and neon have been experimentally studied under high pressure. One stoichiometric compound, with ArNe2 composition, is observed in this system. It is a Laves phase with a hexagonal MgZn2 structure, stable up to at least 65 GPa, the highest pressure reached in the experiments. Its e...

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Bibliographic Details
Published in:The Journal of chemical physics 2019-09, Vol.151 (12)
Main Authors: Dewaele, Agnès, Rosa, Angelika D., Guignot, Nicolas
Format: Article
Language:English
Subjects:
Argon
Atomic radius
Equations of state
Laves phase
Neon
Phase diagrams
Physics
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Summary:Mixtures of argon and neon have been experimentally studied under high pressure. One stoichiometric compound, with ArNe2 composition, is observed in this system. It is a Laves phase with a hexagonal MgZn2 structure, stable up to at least 65 GPa, the highest pressure reached in the experiments. Its equation of state follows closely the one of an ideal Ar+2Ne mixture. The binary phase diagram of the Ar–Ne system resembles the diagram predicted for hard sphere mixtures with a similar atomic radius ratio, suggesting that no electronic interactions appear in this system in this pressure range. ArNe2 can be a convenient quasihydrostatic pressure transmitting medium under moderate pressure.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.5119419