H-Division. Materials Physics quarterly report, October-December 1982. [EASURING METHODS; STANDARDS; BOLTZMANN-VLASOV EQUATION; KINETIC EQUATIONS; LINE WIDTHS; BAND THEORY; CRYSTAL STRUCTURE; STABILITY]

Technical Report · Fri Apr 15 00:00:00 EST 1983

OSTI ID:6454621

Aluminum has been established as an equation of state standard for the nuclear-driven EOS program, and a series of experiments are planned which will accurately characterize the EOS of aluminum. These include shock-wave off-Hugoniot measurements, a diamond anvil iso- therm, isentropic compression, and nuclear-driven impedance matching experiments. These results will be correlated with theoretical models to produce an accurate global EOS for Aluminum. The effects of strong plasma coupling on spectral limeshapes and Thomson scattering profiles have been studied using a Vlasov-like kinetic equation which incorporates the exact static correlations of the plasma. For wavelengths about equal to an interparticle spacing, the ion peak in the Thomson scattering function can be as much as a factor of two greater than its weak-coupling value. However, the widths of plasma-broadening spectral lines are found to be much less sensitive to strong coupling effects. This suggests that the standard theory of electron line-broadening may be adequate for GAMMA less than or equal to 1. A simple rigid-band model approximation is in qualitative agreement with first-principles electron band theory in predicting phase transitions for Na, Mg, Al, and Si. This has lead to an improved understanding of the rules governing crystal structure stability in simple metals.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6454621
• Report Number(s): UCID-18574-82-4; ON: DE83011269
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM
EQUATIONS OF STATE
PLASMA
THOMSON SCATTERING
CRYSTAL-PHASE TRANSFORMATIONS
MAGNESIUM
SILICON
SODIUM
ALKALI METALS
ALKALINE EARTH METALS
DIFFERENTIAL EQUATIONS
ELEMENTS
EQUATIONS
INELASTIC SCATTERING
METALS
PARTIAL DIFFERENTIAL EQUATIONS
PHASE TRANSFORMATIONS
SCATTERING
SEMIMETALS
360102* - Metals & Alloys- Structure & Phase Studies
360104 - Metals & Alloys- Physical Properties
640410 - Fluid Physics- General Fluid Dynamics