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Science 11 February 2000:
Vol. 287. no. 5455, pp. 1027 - 1030
DOI: 10.1126/science.287.5455.1027
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Reports

Physics of Iron at Earth's Core Conditions

A. Laio, 1 S. Bernard, 2 G. L. Chiarotti, 1* S. Scandolo, 13 E. Tosatti 13

The bulk properties of iron at the pressure and temperature conditions of Earth's core were determined by a method that combines first-principles and classical molecular dynamic simulations. The theory indicates that (i) the iron melting temperature at inner-core boundary (ICB) pressure (330 gigapascals) is 5400 (±400) kelvin; (ii) liquid iron at ICB conditions is about 6% denser than Earth's outer core; and (iii) the shear modulus of solid iron close to its melting line is 140 gigapascals, consistent with the seismic value for the inner core. These results reconcile melting temperature estimates based on sound velocity shock wave data with those based on diamond anvil cell experiments.

1 International School for Advanced Studies and Istituto Nazionale per la Fisica della Materia, Via Beirut 2/4, I-34014 Trieste, Italy.
2 Commissariat à l'Energie Atomique, DRIF, BP 12, F-91680 Bruyères la Châtel, France.
3 International Centre for Theoretical Physics, I-34014 Trieste, Italy.
*   To whom correspondence should be addressed. E-mail: guido{at}sissa.it

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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