Structural Transformation and Melting in Gold Shock Compressed to 355 GPa
Journal Article
·
· Physical Review Letters
Gold is believed to retain its ambient crystal structure at very high pressures under static and shock compression, enabling its wide use as a pressure marker. Our in situ x-ray diffraction measurements on shock-compressed gold show that it transforms to the body-centered-cubic (bcc) phase, with an onset pressure between 150 and 176 GPa. A liquid-bcc coexistence was observed between 220 and 302 GPa and complete melting occurs by 355 GPa. Our observation of the lower coordination bcc structure in shocked gold is in marked contrast to theoretical predictions and the reported observation of the hexagonal-close-packed structure under static compression.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1574298
- Journal Information:
- Physical Review Letters, Vol. 123, Issue 4
- Country of Publication:
- United States
- Language:
- English
Direct observation of the hcp-bcc phase transition and melting along the principal Hugoniot of Mg
|
journal | January 2020 |
Measurement of Body-Centered Cubic Gold and Melting under Shock Compression
|
journal | July 2019 |
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