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

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

DOI:https://doi.org/10.1103/PhysRevLett.95.075501· OSTI ID:20699309

Yaakobi, B; 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 ^[1]

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1. Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623 (United States)

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 with 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.

• OSTI ID: 20699309
• Journal Information: Physical Review Letters, Vol. 95, Issue 7; Other Information: DOI: 10.1103/PhysRevLett.95.075501; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION SPECTRA
ABSORPTION SPECTROSCOPY
BCC LATTICES
FINE STRUCTURE
HCP LATTICES
INTERFEROMETRY
IRON
LASERS
PHASE TRANSFORMATIONS
SHOCK WAVES
SIMULATION
VELOCITY
X-RAY SPECTRA
X-RAY SPECTROSCOPY