Structural study of hcp and liquid iron under shock compression up to 275 GPa

Singh, Saransh; Briggs, Richard; Gorman, Martin G.; Benedict, Lorin X.; Wu, Christine J.; Hamel, Sebastien; Coleman, Amy L.; Coppari, Federica; Fernandez-Pañella, Amalia; McGuire, Christopher; Sims, Melissa; Wicks, June K.; Eggert, Jon H.; Fratanduono, Dayne E.; Smith, Raymond F.

doi:10.1103/physrevb.108.184104

Title: Structural study of hcp and liquid iron under shock compression up to 275 GPa

Journal Article · Mon Nov 13 00:00:00 EST 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.108.184104· OSTI ID:2318774

^[1]; Briggs, Richard ^[1];

^[1]; Benedict, Lorin X. ^[1]; Wu, Christine J. ^[1]; Hamel, Sebastien ^[1]; Coleman, Amy L. ^[1]; Coppari, Federica ^[1];

^[2]; McGuire, Christopher ^[1]; Sims, Melissa ^[3]; Wicks, June K. ^[3];

^[1]; Fratanduono, Dayne E. ^[1];

^[1]

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Gordon and Betty Moore Foundation, Palo Alto, CA (United States)
Johns Hopkins University, Baltimore, MD (United States)

Here we combine nanosecond laser shock compression with in situ picosecond x-ray diffraction to provide structural data on iron up to 275 GPa. We constrain the extent of hcp-liquid coexistence, the onset of total melt, and the structure within the liquid phase. Our results indicate that iron, under shock compression, melts completely by 258(8) GPa. A coordination number analysis indicates that iron is a simple liquid at these pressure-temperature conditions. We also perform texture analysis between the ambient body-centered-cubic (bcc) α, and the hexagonal-closed-packed (hcp) high-pressure ε-phase. We rule out the Rong-Dunlop orientation relationship (OR) between the α and ε - phase s. However, we cannot distinguish between three other closely related ORs: Burger's, Mao-Bassett-Takahashi, and Potter's OR. The solid-liquid coexistence region is constrained from a melt onset pressure of 225(3) GPa from previously published sound speed measurements and full melt [246.5(1.8)–258(8) GPa] from x-ray diffraction measurements, with an associated maximum latent heat of melting of 623 J/g. This value is lower than recently reported theoretical estimates and suggests that the contribution to the earth's geodynamo energy budget from heat release due to freezing of the inner core is smaller than previously thought. Melt pressures for these nanosecond shock experiments are consistent with gas gun shock experiments that last for microseconds, indicating that the melt transition occurs rapidly.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)

Grant/Contract Number:: AC52-07NA27344; NA0003957; AC02-06CH11357

OSTI ID:: 2318774

Report Number(s):: LLNL-JRNL-860905; 1072601

Journal Information:: Physical Review. B, Vol. 108, Issue 18; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Structural study of hcp and liquid iron under shock compression up to 275 GPa

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