In-situ X-ray diffraction measurements of the γ-ɛ transition boundary of iron in an internally-heated diamond anvil cell

Details In-situ X-ray diffraction measurements of the γ-ɛ transition boundary of iron in an internally-heated diamond anvil cell In-situ X-ray diffraction measurements of the γ-ɛ transition boundary of iron in an internally-heated diamond anvil cell

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009e%26psl.282..252k&link_type=abstract

Earth and Planetary Science Letters, Volume 282, Issue 1-4, p. 252-257.

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Scientific paper

The phase transition boundary between the γ (face-centered cubic structure) and ɛ (hexagonal close-packed structure) iron phases was determined up to 69 GPa by using a newly developed internally-heated diamond anvil cell, combined with in-situ synchrotron X-ray diffraction measurements. The improved experimental configuration provides stable heating with reliable temperature and pressure determination and phase identification. A simultaneous laser- and internal-heating system was also used to produce further higher temperature at higher pressures. The sample pressure at any given temperature was calculated using an established thermal equation of state for ɛ iron. The γ-ɛ transition boundary was bracketed with the normal and reversal directions and it is linear from 21 to 69 GPa with a dP/dT slope of 0.0394 GPa/K. There is no evidence for the existence of additional iron solid phase other than the γ and ɛ phases over the P-T range of this study. We inferred that the γ-ɛ-liquid triple point of iron should occur at 88 GPa and 2800 K.

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