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Equation of State of Warm Condensed Matter

Published online by Cambridge University Press:  10 February 2011

T. W. Barbee III ,
D. A. Young  and
F. J. Rogers
T. W. Barbee III
Affiliation:
Physics Dept., Lawrence Livermore National Laboratory, Livermore, CA 94550
D. A. Young
Affiliation:
Physics Dept., Lawrence Livermore National Laboratory, Livermore, CA 94550
F. J. Rogers
Affiliation:
Physics Dept., Lawrence Livermore National Laboratory, Livermore, CA 94550
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Abstract

Recent advances in computational condensed matter theory have yielded accurate calculations of properties of materials. These calculations have, for the most part, focused on the low temperature (T=0) limit. An accurate determination of the equation of state (EOS) at finite temperature also requires knowledge of the behavior of the electron and ion thermal pressure as a function of T. Current approaches often interpolate between calculated T=0 results and approximations valid in the high T limit. Plasma physics-based approaches are accurate in the high temperature limit, but lose accuracy below T∼Tfermi. We seek to “connect up” these two regimes by using ab initio finite temperature methods (including linear-response[l] based phonon calculations) to derive an equation of state of condensed matter for T<Tfermi.

We will present theoretical results for the principal Hugoniot of shocked materials, including carbon and aluminum, up to pressures P>100 GPa and temperatures T> 104K, and compare our results with available experimental data.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 499: Symposium DD – High Pressure Materials Research , 1997 , 105
Copyright
Copyright © Materials Research Society 1998

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References

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