EXAFS Measurement of Iron bcc-to-hcp Phase Transformation in Nanosecond-Laser Shocks

Journal Article · Fri Aug 12 04:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.95.075501· OSTI ID:842527

Yaakobi, B ^[1]; Boehly, T R; Meyerhofer, D D; Collins, T J.B.; Remington, B A; Allen, P G; Pollaine, S M; Lorenzana, H E; Eggert, J H

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1. Laboratory for Laser Energetics, U. of Rochester, NY

Extended x-ray absorption fine structure (EXAFS) measurements have demonstrated the phase transformation from body-centered-cubic (bcc) to hexagonal-close-packed (hcp) iron due to nanosecond, laser-generated shocks. The EXAFS spectra are also used to determine the compression and temperature in the shocked iron, which are consistent wth hydrodynamic simulations and with the compression inferred from velocity interferometry. This is a direct, atomic-level, and in-situ proof of shock-induced transformation in iron, as opposed to the previous indirect proof based on shock-wave splitting.

• Research Organization: Laboratory for Laser Energetics
• Sponsoring Organization: USDOE
• DOE Contract Number: FC52-92SF19460
• OSTI ID: 842527
• Report Number(s): DOE/SF-19460-623; 1580; 2005-13
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Vol. 95
• Country of Publication: United States
• Language: English