Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 130, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3082030
Keywords
acoustic wave velocity; high-pressure effects; melting; molybdenum; phase diagrams; shock wave effects; X-ray diffraction
Funding
- U. S. Department of Energy
- Lawrence Livermore National Laboratory [DE-AC5207NA27344]
- Max-Planck-Institute fur Chemie at Mainz, Germany.
- Spanish MICINN [CSD-2007-00045]
- Generalitat Valenciana [GV2008-112]
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In this paper, we report angle-dispersive X-ray diffraction data of molybdenum melting, measured in a double-sided laser-heated diamond-anvil cell up to a pressure of 119 GPa and temperatures up to 3400 K. The new melting temperatures are in excellent agreement with earlier measurements up to 90 GPa that relied on optical observations of melting and in strong contrast to most theoretical estimates. The X-ray measurements show that the solid melts from the bcc structure throughout the reported pressure range and provide no evidence for a high temperature transition from bcc to a close-packed structure, or to any other crystalline structure. This observation contradicts earlier interpretations of shock data arguing for such a transition. Instead, the values for the Poisson ratios of shock compressed Mo, obtained from the sound speed measurements, and the present X-ray evidence of loss of long-range order suggest that the 210 GPa (similar to 4100 K) transition in the shock experiment is from the bcc structure to a new, highly viscous, structured melt.
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