%0 Journal Article %T Stability and equation of state of face-centered cubic and hexagonal close packed phases of argon under pressure %+ Centre d'Études de Limeil-Valenton (CEA-DAM) %+ Laboratoire Matière en Conditions Extrêmes %+ European Synchroton Radiation Facility [Grenoble] (ESRF) %+ Synchrotron SOLEIL (SSOLEIL) %+ Laboratoire Magmas et Volcans (LMV) %A Dewaele, Agnès %A Rosa, Angelika, D %A Guignot, Nicolas %A Andrault, Denis %A Rodrigues, João Elias F. S. %A Garbarino, Gaston %< avec comité de lecture %@ 2045-2322 %J Scientific Reports %I Nature Publishing Group %V 11 %N 1 %P 15192 %8 2021-07-26 %D 2021 %R 10.1038/s41598-021-93995-y %K Condensed-matter physics %K Phase transitions and critical phenomena %K Structure of solids and liquids %Z Sciences of the Universe [physics]/Earth Sciences/PetrographyJournal articles %X 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). %G English %2 https://uca.hal.science/hal-03524058/document %2 https://uca.hal.science/hal-03524058/file/Argon_SciRep_Resub1.pdf %L hal-03524058 %U https://uca.hal.science/hal-03524058 %~ IRD %~ CEA %~ INSU %~ PRES_CLERMONT %~ CNRS %~ LMV %~ GIP-BE %~ DAM %~ ACL-SF %~ CEA-UPSAY %~ UNIV-PARIS-SACLAY %~ SYNCHROTRON-SOLEIL %~ OPGC %~ UNIVERSITE-PARIS-SACLAY %~ GS-PHYSIQUE %~ INSTITUT-SCIENCES-LUMIERE %~ TEST3-HALCNRS