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Phase Transition in Ar(H2)2: Its Relation to Hydrogen Metallization Under Pressure

Published online by Cambridge University Press:  10 February 2011

S. Bernard ,
P. Loubeyre  and
G. Zerah
S. Bernard
Affiliation:
Commissariat à l'Energie Atomique, Centre d'Etudes de Limeil-Valentón, 94195 Villeneuve Saint Georges, France
P. Loubeyre
Affiliation:
Physique des Milieux Condensés (CNRS URA 782), Boîte 77, Université Paris 6, 4 place Jussieu, 75252 Paris, France
G. Zerah
Affiliation:
Commissariat à l'Energie Atomique, Centre d'Etudes de Limeil-Valentón, 94195 Villeneuve Saint Georges, France
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Extract

In the general framework of high pressure Hydrogen studies[l][2], it has been recently suggested[3] that hydrogen could metallize at much lower pressures, within experimentally accessible values, in a new compound, Ar(H2)2. Subsequent Raman measurements showed a transition around Pobs=175 GPa, but have not been interpreted satisfactorily up to now. Moreover, the experimental situation is quite confusing. Infra-red measurements on Ar(H2)2 up to 220 GPa[4] did not confirm the Raman results. We have thus carefully investigated the physical properties of Ar(H2)2 in the multimegabar range, especially as the experiments are difficult, and the diagnostics can suffer from spurious effects (such as the influence of the uniaxial component of pressure on the transition) [5].

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 499: Symposium DD – High Pressure Materials Research , 1997 , 157
Copyright
Copyright © Materials Research Society 1998

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References

REFERENCES

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