Skip to Main content Skip to Navigation
Journal articles

Stability and equation of state of face-centered cubic and hexagonal close packed phases of argon under pressure

Abstract : 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: $$V_0$$ V 0 = 38.0 Å $$^3$$ 3 /at, $$K_0$$ K 0 = 2.65 GPa, $$K'_0$$ K 0 ′ = 7.423. Under the current experimental conditions, non-hydrostaticity affects measured P – V points mostly at moderate pressure ( $$\le$$ ≤ 20 GPa).
Document type :
Journal articles
Complete list of metadata

https://hal.uca.fr/hal-03524058
Contributor : Sylvaine Jouhannel Connect in order to contact the contributor
Submitted on : Thursday, January 13, 2022 - 9:00:23 AM
Last modification on : Friday, April 1, 2022 - 3:56:32 AM
Long-term archiving on: : Thursday, April 14, 2022 - 6:16:37 PM

File

Argon_SciRep_Resub1.pdf
Files produced by the author(s)

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Citation

Agnès Dewaele, Angelika Rosa, Nicolas Guignot, Denis Andrault, João Elias F. S. Rodrigues, et al.. Stability and equation of state of face-centered cubic and hexagonal close packed phases of argon under pressure. Scientific Reports, Nature Publishing Group, 2021, 11 (1), pp.15192. ⟨10.1038/s41598-021-93995-y⟩. ⟨hal-03524058⟩

Share

Metrics

Record views

15

Files downloads

13