Using one of the most powerful lasers on the planet, researchers in Science have determined the melting temperature of iron at conditions like those in the cores of super-Earth exoplanets. Read more ⬇ SciencePerspective:
The pressure and temperature conditions at which iron melts are important for terrestrial planets because they determine the size of the liquid metal core, an important factor for understanding the potential for generating a radiation-shielding magnetic field. Kraus. used laser-driven shock to determine the iron-melt curve up to a pressure of 1000 gigapascals . This value is about three times that of the Earth’s inner core boundary.
Given the prominence of iron in planetary interiors, we require accurate and precise physical properties at extreme pressure and temperature. A first-order property of iron is its melting point, which is still debated for the conditions of Earth’s interior. We used high-energy lasers at the National Ignition Facility and in situ x-ray diffraction to determine the melting point of iron up to 1000 gigapascals, three times the pressure of Earth’s inner core.
France Dernières Nouvelles, France Actualités
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