Crystal Structure and Melting of Fe Shock Compressed to 273 GPa: In Situ X-Ray Diffraction

Turneaure, Stefan  J.; Sharma, Surinder M.; Gupta, Y. M.

doi:10.1103/physrevlett.125.215702

Title: Crystal Structure and Melting of Fe Shock Compressed to 273 GPa: In Situ X-Ray Diffraction

Journal Article · Wed Nov 18 00:00:00 EST 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.125.215702· OSTI ID:1728707

Turneaure, Stefan J. ^[1];

^[1];

^[1]

Washington State Univ., Pullman, WA (United States)

Despite extensive shock wave and static compression experiments and corresponding theoretical work, consensus on the crystal structure and the melt boundary of Fe at Earth’s core conditions is lacking. We present in situ x-ray diffraction measurements in laser-shock compressed Fe that establish the stability of the hexagonal-close-packed (hcp) structure along the Hugoniot through shock melting, which occurs between ~242 to ~247 GPa. Using previously reported hcp Fe Hugoniot temperatures, the melt temperature is estimated to be 5560(360) K at 242 GPa, consistent with several reported Fe melt curves. Extrapolation of this value suggests ~6400 K melt temperature at Earth’s inner core boundary pressure.

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Research Organization:: Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: NA0002007; AC02-06CH11357; NA0003957; NA0002442

OSTI ID:: 1728707

Alternate ID(s):: OSTI ID: 1728710; OSTI ID: 1729906

Journal Information:: Physical Review Letters, Vol. 125, Issue 21; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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