Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986qjras..27..383m&link_type=abstract
Quarterly Journal of the Royal Astronomical Society, Vol. 27, NO.3/SEP, P.383, 1986
Astronomy and Astrophysics
Astronomy
6
Scientific paper
The melting curve of iron at high pressure is important for inferring the temperature profile in the Earth's outer core which is known to be composed mainly of iron but with impurities of lighter elements. The available data on melting are reviewed although these refer mostly to atmospheric pressure. There exist different types of melt depending on the condition of the associated short range molecular order and melting is affected by the details of the molecular properties of the material. A study of the melting process shows no fewer than six contributions to the entropy and enthalpy of fusion. It is concluded that the reduction to a simple scaling law is associated with the neglect of local asymmetries and this is a good approximation for substances with essentially simple spherically symmetric molecules. Such theories are able to predict correctly the melting temperature of iron up to 2.5 Mbar. The corresponding temperature is about 5800K.
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