T. Van Hoolst

A new ab initio equation of state of hcp-Fe and its implication on the interior structure and mass-radius relations of rocky super-Earths

K. Hakim, A. Rivoldini, T. Van Hoolst, S. Cottenier, J. Jaeken, T. Chust, G. Steinle-Neuman, G. Steinle-Neumann
Volume 313, pages 61-78


More than a third of all exoplanets can be classified as super-Earths based on radius (1-2 R-circle plus)) and mass (

Crystal structure prediction for iron as inner core material in heavy terrestrial planets

S. Cottenier, M.I.J. Probert, T. Van Hoolst, V. Van Speybroeck, M. Waroquier
Earth and Planetary Science Letters
312, 237–242


The relative stability of different crystal structures for pure Fe under applied pressure is calculated from quantum mechanics, using the highly accurate APW+lo method. In the pressure range of 0–100 TPa, we corroborate the prediction that iron adopts subsequently the bcc, hcp, fcc, hcp and bcc structures. In contrast to previous studies, we identify a family of stacking fault structures that are competing with the ground state structure at all pressures. Implications for the properties of the inner core of the Earth and heavy terrestrial exoplanets are discussed.


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