Physics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29g..54a&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 7, pp. 54-1, CiteID 1150, DOI 10.1029/2001GL014350
Physics
17
Tectonophysics: Earth'S Interior-Composition And State (1212), Mineral Physics: Equations Of State, Mineral Physics: High-Pressure Behavior, Mineral Physics: Shock Wave Experiments
Scientific paper
Shock-wave experiments on iron preheated to 1573 K from 14 to 73 GPa, yield sound velocities of the γ- and liquid-phases. Melting is observed in the highest pressure (~71 +/- 2 GPa) experiments at calculated shock temperatures of 2775 +/- 160 K. This single crossing of the γ-liquid boundary agrees with the γ-iron melting line of Boehler [1993], Saxena et al. [1993], and Jephcoat and Besedin [1997]. This γ-iron melting curve is ~300°C lower than that of Shen et al. [1998] at 80 GPa. In agreement with Brown [2001] the discrepancy between the diamond cell melting data and the iron shock temperatures require the occurrence of yet another sub-solidus phase along the principal Hugoniot at ~200 GPa. This would reconcile the static and dynamic data for iron's melting curve. Upward pressure and temperature extrapolation of the γ-iron melting curve to 330 GPa yields 5300 +/- 400 K for the inner core-outer core boundary temperature.
Ahrens Thomas J.
Chen George Q.
Holland Kathleen G.
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