High-pressure melting, phase transitions and structures of iron have been studied to 84 GPa and 3500 K with an improved laser heated diamond anvil cell technique and in situ high P-T x-ray diffraction. At pressures below 60 GPa, the lower bound on the melting curve is close to those measured by Boehler  and Saxena et al. ; however, at pressures above 60 GPa our data indicate melting at higher temperatures than these studies, but still lower than the melting curve of Williams et al . The ε-gamma;-1 triple point is 60(±5) GPa and 2800(±200) K, based on our data of the ε-gamma; phase transition and the observation of melting by in situ x-ray diffraction. No solid phases other than ε-Fe and γ-Fe were observed in situ at high temperatures (>1000 K) and pressures to 84 GPa. However, the diffraction patterns of temperature quenched products at high pressure can be fit to other structures such as dhcp.
|Original language||English (US)|
|Number of pages||4|
|Journal||Geophysical Research Letters|
|State||Published - Feb 1 1998|
All Science Journal Classification (ASJC) codes
- Earth and Planetary Sciences(all)