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Dewaele, Agnès; Rosa, Angelika D; Guignot, Nicolas; Andrault, Denis; Rodrigues, João Elias F S; Garbarino, Gaston
Scientific reports, 07/2021, Volume: 11, Issue: 1Journal Article
The compression of argon is measured between 10 K and 296 K up to 20 GPa and and up to 114 GPa at 296 K in diamond anvil cells. Three samples conditioning are used: (1) single crystal sample directly compressed between the anvils, (2) powder sample directly compressed between the anvils, (3) single crystal sample compressed in a pressure medium. A partial transformation of the face-centered cubic (fcc) phase to a hexagonal close-packed (hcp) structure is observed above 4.2-13 GPa. Hcp phase forms through stacking faults in fcc-Ar and its amount depends on pressurizing conditions and starting fcc-Ar microstructure. The quasi-hydrostatic equation of state of the fcc phase is well described by a quasi-harmonic Mie-Grüneisen-Debye formalism, with the following 0 K parameters for Rydberg-Vinet equation: Formula: see text = 38.0 ÅFormula: see text/at, Formula: see text = 2.65 GPa, Formula: see text = 7.423. Under the current experimental conditions, non-hydrostaticity affects measured P-V points mostly at moderate pressure (Formula: see text 20 GPa).
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