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El hierro, con estados de oxidación 2 y 3, se encuentra combinado con otros elementos en cientos de minerales. Los más importantes para la extracción del hierro son la hematita, la magnetita, la limonita y la siderita. 
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We live in a violent universe. The energy scales involved in many astrophysical processes are enough to stamp out our planet, not to talk about life as we know it. But, somehow, we have been living so far in a delicate equilibrium. Such equilibrium has been punctuated by relatively modest catastrophes that have possibly shaped our evolution; the Damocles’ sword is hanging over our heads and there is no much we can do about it, except keep an eye on the sky.
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Working at temperatures matching the interior of the sun, researchers at Sandia National Laboratories’ Z machine have been able to determine experimentally, for the first time in history, iron’s role in inhibiting energy transmission from the center of the sun to near the edge of its radiative band — the section of the solar interior between the sun’s core and outer convection zone. Because that role is much greater than formerly surmised, the new, experimentally derived amount of iron’s opacity — essentially, its capacity for hindering the transport of radiative energy originating in nuclear fusion reactions deep in the sun’s interior — helps close a theoretical gap in the Standard Solar Model, widely used by astrophysicists as a foundation to model the behavior of stars. “Our data, when inserted into the theoretical model, bring its predictions more closely into alignment with physical observations,” said Sandia lead investigator Jim Bailey. His team’s work appeared Jan. 1 in the journalNature.
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« Retazos de historia Nanofotónica: luz + nanopartículas = Futuro tecnológico » Ya he escrito en otras ocasiones sobre el gran astrofísico Fred Hoyle , que tenía un dominio de la física nuclear no superado entre los astrónomos, hombre de...
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Ocurrió hace diez años, por sorpresa, como casi siempre ocurre en el ámbito de la superconductividad. El grupo del Profesor Hosono en Tokio intentaba mejorar las propiedades de materiales para su uso en pantallas de ordenadores y televisores. Entre los compuestos bajo estudio se encontraba el LaFeAsO. La sorpresa apareció al cambiar ligeramente la composición …
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Researchers at Sandia National Laboratories' Z machine, the most powerful deliverer of bursts of electrical energy in the world, have helped untangle a long-standing mystery of astrophysics: why iron is found spattered throughout Earth's...
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Átomos de hierro (Fe) en superficie de cobre (Cu). Maravillas de la Mecánica Cuántica. Maravillas de #FísicayQuímica. http://t.co/jPNPU6SdOb
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