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Crystallographic Anisotropy in Compression of Uranium Metal to 100 GPa

Published online by Cambridge University Press:  01 February 2011

Yogesh K. Vohra ,
Kevin M. Hope ,
J. Reed Patterson  and
Jagannadham Akella
Yogesh K. Vohra
Affiliation:
Department of Physics, University of Alabama at Birmingham (UAB) Birmingham, AL 35294–1170.
Kevin M. Hope
Affiliation:
Department of Physics, University of Alabama at Birmingham (UAB) Birmingham, AL 35294–1170.
J. Reed Patterson
Affiliation:
L-201, Lawrence Livermore National Laboratory (LLNL), Livermore, CA 94550, U.S.A.
Jagannadham Akella
Affiliation:
L-201, Lawrence Livermore National Laboratory (LLNL), Livermore, CA 94550, U.S.A.
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Abstract

New high-pressure x-ray diffraction data on uranium metal (99.9 %) in a diamond anvil cell is presented to 100 GPa (Volume compression V/Vo = 0.700) at room temperature using a variety of pressure markers like ruby, copper, and platinum. The diffraction patterns are carefully indexed allowing for reversal of peak positions based on anisotropic compression. We report anisotropic compression of the orthorhombic unit cell with the axial ratio b/a increasing initially to 40 GPa followed by a rapid decrease at higher pressure. On the other hand, axial ratio c/a shows a rapid increase with increasing pressure followed by saturation at megabar pressures. The most recent full potential electronic structure calculations reproduce the increasing tend of axial ratio c/a to 100 GPa but do not explain the variation in the b/a ratio. Our detailed analysis of all available experimental data also indicates that the observed anisotropic effects are intrinsic to Uranium and are independent of the pressure medium used in the high-pressure experiments.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 802: Symposium DD – Actinides - Basic Science, Applications, and Technology , 2003 , DD1.7
Copyright
Copyright © Materials Research Society 2004

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References

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