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Equation d'état du fer comprimé par choc laser

Abstract : This PhD thesis enters the field of highly compressed materials equation of state studies. In particular, it focuses on the case of laser shock compressed iron. This work indeed aims at getting to the conditions of the Earth's core, comprising a solid inner core and a liquid outer core. The understanding of phenomena governing the core's thermodynamics and the geodynamo process requires the knowledge of iron melting line locus around the solid-liquid interface at 3.3 Mbar. Several experiments were performed to that extent. First, an absolute measurement of iron Hugoniot was obtained. Following is a study of partially released states of iron into a window material : lithium fluoride (LiF). This configuration enables direct access to compressed iron optical propreties such as reflectivity and self-emission. Interface velocity measurement is dominated by compressed LiF optical properties and is used as a pressure gauge. Using a dual wavelength reflectivity diagnostic, compressed iron electrical conductivity was estimated and found to be in good agreement with previous results found in geophysics literature. Self-emission diagnostic was used to measure temperature of partially released iron and revealed a solid-liquid phase transition at Mbar pressures.
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Contributor : Gael Huser <>
Submitted on : Wednesday, September 15, 2004 - 1:26:57 PM
Last modification on : Friday, July 31, 2020 - 9:22:02 AM
Long-term archiving on: : Wednesday, November 23, 2016 - 5:23:33 PM

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  • HAL Id : tel-00006895, version 1

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Gael Huser. Equation d'état du fer comprimé par choc laser. Physique Atomique [physics.atom-ph]. Ecole Polytechnique X, 2004. Français. ⟨tel-00006895⟩

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