High-pressure equation of state of Li, Na, and K

Conference · Tue Jun 21 04:00:00 EDT 1983

OSTI ID:5994705

Ross, M; Young, D A; Boehler, R

We examined the usefulness of local pseudopotential theory at high pressure by a systematic comparison of experimental Li, Na, and K data with theoretical predictions. For the prupose of this study, new measurements were made for the melting curve to 32 kbar and of delta P/delta T)/sub s/ to 32 kbar and 400/sup 0/C. We used room temperature isotherms to determine the two parameter Heine-Abarenkov local pseudopotential. Calculations of the melting curves, liquid isotherms, and delta P/delta T)/sub s/ were generally in good agreement with experiment. The major deficiency in the theory appears to stem from the unrealistically soft behavior of the potential at small interatomic separations which lead to negative Grueneisen parameters at high compression. This feature is probably also responsible for some of the disagreements between theoretical and experimental Hugoniots.

• Research Organization: Lawrence Livermore National Lab., CA (USA); California Univ., Los Angeles (USA). Inst. of Geophysics and Planetary Physics
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5994705
• Report Number(s): UCRL-88635; CONF-830768-1; ON: DE83014844
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALKALI METALS
DATA
ELEMENTS
EQUATIONS
EQUATIONS OF STATE
EXPERIMENTAL DATA
FLUIDS
HIGH TEMPERATURE
INFORMATION
LIQUID METALS
LIQUIDS
LITHIUM
METALS
NUMERICAL DATA
PHASE STUDIES
POTASSIUM
SODIUM
VERY HIGH PRESSURE