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Título:
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Low viscosity of the Earth’s inner core
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Autores:
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Belonoshko, Anatoly B. ;
Fu, Jie ;
Bryk, Taras ;
Simak, Sergei I. ;
Mattesini, Maurizio
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Tipo de documento:
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texto impreso
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Editorial:
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Nature Publishing Group, 2019-06-06
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Dimensiones:
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application/pdf
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Nota general:
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cc_by
info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Física atmosférica
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Tipo = Artículo
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Resumen:
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The Earth’s solid inner core is a highly attenuating medium. It consists mainly of iron. The high attenuation of sound wave propagation in the inner core is at odds with the widely accepted paradigm of hexagonal close-packed phase stability under inner core conditions, because sound waves propagate through the hexagonal iron without energy dissipation. Here we show by first-principles molecular dynamics that the body-centered cubic phase of iron, recently demonstrated to be thermodynamically stable under the inner core conditions, is considerably less elastic than the hexagonal phase. Being a crystalline phase, the bodycentered cubic phase of iron possesses the viscosity close to that of a liquid iron. The high attenuation of sound in the inner core is due to the unique diffusion characteristic of the body-centered cubic phase. The low viscosity of iron in the inner core enables the convection and resolves a number of controversies.
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En línea:
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https://eprints.ucm.es/57099/1/MattesiniM%2004LIBRE%2BCC.pdf
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