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American Mineralogist; February 2000; v. 85; no. 2; p. 372-375
© 2000 Mineralogical Society of America
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Iron phases at high pressures and temperatures: Phase transition and melting

S.K. Saxena* and L.S. Dubrovinsky

2 Institute of Earth Sciences, Uppsala University, S-752 36 Uppsala, Sweden

Correspondence: * Current Address: Center for Study of Matter at Extreme Conditions, Florida International University, PC344, University Park, Miami, Florida 33197; E-mail: saxenas{at}fiu.edu

Based on an in situ X-ray study of Fe and a review of the available data, we propose the following triple-points in the Fe phase diagram—the hexagonal closest packed (HCP), face-centered cubic (FCC), and the ß phase: P = 40 (4) GPa at T = 1550 (100) K, the ß-phase-FCC-melt; P = 60 (10) GPa at T = 2600 (100) K. We define the stability of ß phase from a combination of new X-ray results on externally heated Fe between pressures of 37 to 300 GPa, as well as the previous data on externally heated and laser-heated samples. X-ray data on externally heated Fe, without any pressure medium, confirms the double hexagonal closest packed (DHCP) structure for the ß phase. The HCP-ß phase boundary has a very small negative dP/dT indicating the similarity of physical properties (molar volume, thermal expansion, and bulk modulus) between the two phrases, but a higher entropy and enthalpy for the ß phase.




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O. L. Anderson and D. G. Isaak
Calculated melting curves for phases of iron
American Mineralogist, February 1, 2000; 85(2): 376 - 385.
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