High-pressure melting temperatures of uranium: Laser-heating experiments and theoretical calculations

Journal Article · Wed Dec 01 00:00:00 EST 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.15529· OSTI ID:5775712

Yoo, C S; Akella, J; Moriarty, J A ^[1]

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1. Lawrence Livermore National Laboratory, University of California, Livermore, California 94551 (United States)

The melting temperatures of uranium have been measured to 45 GPa with an inert Ar pressure medium in a diamond-anvil cell using a spatially resolved laser-heating system. The temperature was measured within 1.4 [mu]m at the center of laser-heating spot using reflecting optics, and the melting was visually observed as the material flows forming a microchannel and/or by a shape change in the edge of the sample. Theoretically, the melting curve has also been calculated to 100 GPa via [gamma](bcc) solid and liquid free energies derived from generalized pseudopotential theory. The calculated melting temperatures agree well with the experimental measurements. It is also found that the theoretical melting curve obeys a Lindemann scaling law for solid densities up to about 25.5 g/cm[sup [minus]3], corresponding to 100 GPa in pressure.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5775712
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 48:21; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
URANIUM
MELTING POINTS
ELECTRONIC STRUCTURE
LASER RADIATION
PRESSURE DEPENDENCE
SCALING
VERY HIGH PRESSURE
ACTINIDES
ELECTROMAGNETIC RADIATION
ELEMENTS
METALS
PHYSICAL PROPERTIES
RADIATIONS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
360102* - Metals & Alloys- Structure & Phase Studies