Equation of state of warm condensed matter

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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{approximately}T{sub Fermi}. We seek to ``connect up`` these two regimes by ... continued below

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10 p.

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Barbee, T.W., III; Young, D.A. & Rogers, F.J. March 1, 1998.

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Description

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{approximately}T{sub Fermi}. We seek to ``connect up`` these two regimes by using ab initio finite temperature methods (including linear-response[1] based phonon calculations) to derive an equation of state of condensed matter for T{<=}T{sub Fermi}. 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>10{sup 4}K, and compare our results with available experimental data.

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10 p.

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OSTI as DE98057717

Other: FDE: PDF; PL:

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  • 1997 fall meeting of the Materials Research Society, Boston, MA (United States), 1-5 Dec 1997

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  • Other: DE98057717
  • Report No.: UCRL-JC--130201
  • Report No.: CONF-971201--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 301078
  • Archival Resource Key: ark:/67531/metadc688585

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  • March 1, 1998

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  • July 25, 2015, 2:20 a.m.

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  • April 6, 2017, 6:26 p.m.

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Barbee, T.W., III; Young, D.A. & Rogers, F.J. Equation of state of warm condensed matter, article, March 1, 1998; California. (digital.library.unt.edu/ark:/67531/metadc688585/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.