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Structural study of hcp and liquid iron under shock compression up to 275 GPa
Abstract
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 experimentsmore »
- Authors:
-
[1];
[1];
[2];
[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)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
- OSTI Identifier:
- 2318774
- Report Number(s):
- LLNL-JRNL-860905
Journal ID: ISSN 2469-9950; 1072601
- Grant/Contract Number:
- AC52-07NA27344; NA0003957; AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 108; Journal Issue: 18; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; liquid-solid phase transition; phase transitions; shock waves; solid-solid transformations; laser ablation; x-ray diffraction
Citation Formats
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., and Smith, Raymond F. Structural study of hcp and liquid iron under shock compression up to 275 GPa. United States: N. p., 2023.
Web. doi:10.1103/physrevb.108.184104.
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. Structural study of hcp and liquid iron under shock compression up to 275 GPa. United States. https://doi.org/10.1103/physrevb.108.184104
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., and Smith, Raymond F. Mon .
"Structural study of hcp and liquid iron under shock compression up to 275 GPa". United States. https://doi.org/10.1103/physrevb.108.184104.
@article{osti_2318774,
title = {Structural study of hcp and liquid iron under shock compression up to 275 GPa},
author = {Singh, Saransh and Briggs, Richard and Gorman, Martin G. and Benedict, Lorin X. and Wu, Christine J. and Hamel, Sebastien and Coleman, Amy L. and Coppari, Federica and Fernandez-Pañella, Amalia and McGuire, Christopher and Sims, Melissa and Wicks, June K. and Eggert, Jon H. and Fratanduono, Dayne E. and Smith, Raymond F.},
abstractNote = {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.},
doi = {10.1103/physrevb.108.184104},
journal = {Physical Review. B},
number = 18,
volume = 108,
place = {United States},
year = {Mon Nov 13 00:00:00 EST 2023},
month = {Mon Nov 13 00:00:00 EST 2023}
}
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