Viscosity change and structural transition of Molten Fe at 5 GPa

Details Viscosity change and structural transition of Molten Fe at 5 GPa Viscosity change and structural transition of Molten Fe at 5 GPa

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29h..68t&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 8, pp. 68-1, CiteID 1227, DOI 10.1029/2001GL014321

Physics

6

Tectonophysics: Planetary Interiors (5430, 5724), Tectonophysics: Physics Of Magma And Magma Bodies, Mineral Physics: X Ray, Neutron, And Electron Spectroscopy And Diffraction

Scientific paper

The in situ viscosity measurements of the pure molten Fe under high pressures were made by falling sphere X-ray radiography method. Viscosity coefficients at about 2000 K were 15-24 mPa s at 2.7-5.0 GPa, and 4-9 mPa s at 5.0-7.0 GPa. Drastic decrease was found at around 5 GPa, at which stable solid phase below the melting temperatures change from delta (bcc) to gamma (fcc) phases. The observation indicates the possibility that the structural change in the molten Fe occurs in a narrow pressure interval (1 GPa) at the similar condition with the phase transformation in the solid.

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