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Phys. Rev. Lett. 95, 075501 (2005) [4 pages]

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

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B. Yaakobi, T. R. Boehly, D. D. Meyerhofer, and T. J. B. Collins
Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA

B. A. Remington, P. G. Allen, S. M. Pollaine, H. E. Lorenzana, and J. H. Eggert
Lawrence Livermore National Laboratory, Livermore, California 94550, USA

Received 26 April 2005; published 9 August 2005

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.


©2005 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.95.075501
DOI: 10.1103/PhysRevLett.95.075501
PACS: 64.70.Kb, 61.10.Ht, 61.80.Ba, 62.50.+p

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