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