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- W4366388701 abstract "We combine nanosecond laser shock compression with emph{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) $alpha$, and the hexagonal-closed-packed (hcp) high-pressure $epsilon-$phase. We rule out the Rong-Dunlop orientation relationship (OR) between the $alpha$ and $epsilon-$phases. 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 latent heat of melting of 362(56) - 542(83) 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." @default.
- W4366388701 created "2023-04-21" @default.
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- W4366388701 date "2023-04-16" @default.
- W4366388701 modified "2023-09-26" @default.
- W4366388701 title "A structural study of hcp and liquid iron under shock compression up to 275 GPa" @default.
- W4366388701 doi "https://doi.org/10.48550/arxiv.2304.07933" @default.
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