Viscosity change and structural transition of Molten Fe at 5 GPa

Hidenori Terasaki, Takumi Kato, S. Urakawa, K. Funakoshi, K. Sato, A. Suzuki, T. Okada

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32 Citations (Scopus)


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.

Original languageEnglish
Article number1227
JournalGeophysical Research Letters
Issue number8
Publication statusPublished - Apr 15 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • General Earth and Planetary Sciences


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