Nicolas Guignot

Synchrotron soleil

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Co-Authors

D. Andrault

Laboratoire Magmas et Volcans

Andrew King

Synchrotron soleil

G. Morard

Institut de Recherche pour le Développement

Mohamed Mézouar

European Synchrotron Radiation Facility

Nathalie Bolfan‐Casanova

Laboratoire Magmas et Volcans

Julien Chantel

Unité Matériaux et Transformations

Daniele Antonangeli

Institut de minéralogie, de physique des matériaux et de cosmochimie

Gastón Garbarino

European Synchrotron Radiation Facility

E. Boulard

Institut de minéralogie, de physique des matériaux et de cosmochimie

Agnès Dewaele

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Cooperative Institutions

Centre National de la Recherche Scientifique

112

Sorbonne Université

Institut de minéralogie, de physique des matériaux et de cosmochimie

Institut de Recherche pour le Développement

Université Paris Cité

University of Bayreuth

European Synchrotron Radiation Facility

Carnegie Institution for Science

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Laboratoire Magmas et Volcans

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Experimental high pressure and high temperature study of the incorporation of uranium in Al-rich CaSiO3 perovskite

Physics of The Earth and Planetary Interiors (2008)

Steeve Gréaux Laurent Gautron D. Andrault Nathalie Bolfan‐Casanova Nicolas Guignot

Tetragonal crystal system

Diamond anvil cell

10.1016/j.pepi.2008.06.010

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Citations (15)

A New Thermal Equation of State for Iron at Megabar Pressure

AGU Fall Meeting Abstracts (2007)

G. Fiquet James Badro Anne‐Line Auzende Eugene Gregoryanz Julien Siebert

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Citations (3)

Thermal expansion of liquid Fe-S alloy at high pressure

Earth and Planetary Science Letters (2021)

Fang Xu G. Morard Nicolas Guignot Attilio Rivoldini Geeth Manthilake

Liquidus

Supercooling

Temperature Gradient

10.1016/j.epsl.2021.116884

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Citations (9)

Melting of lead under high pressure studied using second-scale time-resolved x-ray diffraction

Physical Review B (2007)

Agnès Dewaele Mohamed Mézouar Nicolas Guignot Paul Loubeyre

The high pressure and high temperature phase diagram of lead has been studied up to $80\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ and $3700\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ in a laser-heated diamond anvil cell. Melting and solid-solid phase transitions have been followed with a second scale by in situ synchrotron time-resolved x-ray diffraction. The detection of the x-ray signal scattered by the liquid was used as an objective criterion for melting. We evidenced that the melting phenomenon in a diamond anvil cell has a typical lifetime that can be as low as $1\phantom{\rule{0.3em}{0ex}}\mathrm{s}$. Unlike a previous laser-heated diamond anvil cell study, the measured melting curve is in agreement with melting points detected using dynamic compression and confirms the predictions of ab initio calculations. The pressure-temperature conditions of the hcp-bcc phase transition have been measured, and the hcp-bcc-liquid triple point has been located around $39\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ and $2400\phantom{\rule{0.3em}{0ex}}\mathrm{K}$.

Diamond anvil cell

Triple point

Melting curve analysis

10.1103/physrevb.76.144106

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Citations (109)

Le rayonnement synchrotron : un outil de pointe pour la science sous conditions extrêmes de pression et de température

Reflets de la physique (2013)

Mohamed Mézouar Agnès Dewaele Nicolas Guignot Paul Loubeyre

Le rayonnement X intense des sources synchrotrons modernes s’est imposé comme un outil incontournable pour les études in situ sous conditions extrêmes de pression et de température. Deux études récentes ont été sélectionnées pour illustrer le potentiel de ce type d’expérience.Le premier exemple réside dans la détermination précise de la courbe de fusion du tantale par diffraction X. Le second exemple concerne l’étude de la densité du magma lunaire par absorption X; ces mesures permettent d’expliquer simplement l’absence d’activité volcanique à la surface de la Lune.

10.1051/refdp/201334070

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Citations (2)

Phase transformations of subducted basaltic crust in the upmost lower mantle

Physics of The Earth and Planetary Interiors (2006)

Jean‐Philippe Perrillat Angèle Ricolleau I. M. Daniel G. Fiquet Mohamed Mézouar

Stishovite

Silicate perovskite

10.1016/j.pepi.2006.04.001

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Citations (80)

Equations of state of Na?K?Al host phases and implications for MORB density in the lower mantle

Physics of The Earth and Planetary Interiors (2004)

Nicolas Guignot

Diamond anvil cell

Formula unit

10.1016/s0031-9201(04)00049-4

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Citations (0)

Density measurements and structural properties of liquid and amorphous metals under high pressure studied by in situ X-ray scattering (Invited)

G. Morard Gastón Garbarino D. Andrault Daniele Antonangeli Nicolas Guignot

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Uranium in the Earth's lower mantle

Geophysical Research Letters (2006)

Laurent Gautron Steeve Gréaux D. Andrault Nathalie Bolfan‐Casanova Nicolas Guignot

The distribution of the radiogenic heat sources strongly influences the geodynamics and thermal behaviour of the Earth. About 11 TW is produced by the radioactive decay of uranium (25% of the total heat flux at Earth surface), and 55% of this energy comes from the lower mantle. Here we report the first experimental evidence that aluminous CaSiO 3 perovskite is the major, or even the only, host of uranium in the Earth lower mantle, since such a phase is able to incorporate up to 35 wt% UO 2 (or 4 at% of U). The aluminous Ca‐perovskite could be the main U‐bearing constituent of a dense and radiogenic reservoir proposed in a recent model and located in the bottom half of the lower mantle.

Radiogenic nuclide

geodynamics

10.1029/2006gl027508

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Citations (38)

An in-situ experimental HP/HT study on bromine release from a natural basalt

Chemical Geology (2023)

Tobias Grützner Hélène Bureau E. Boulard P. Munsch Nicolas Guignot

We present the first in-situ partitioning data for bromine between a natural basaltic melt and a coexisting fluid. For this study hydrothermal diamond anvil cell experiments at pressures up to 1.7 GPa were conducted. We combined laser heating to melt the basalt glass with external heating to lower the temperature gradient in the cell and to initiate circulation for the aqueous fluid. Bromine concentrations were measured in-situ with X-ray fluorescence in the basaltic melts, glasses, and in the fluid. From the results we calculated partition coefficients of DBrfluid/melt = 1.19 to 3.92 in the range of 0.4 to 1 GPa for aqueous fluids. Experiments with neon as the surrounding fluid (DBrfluid/melt = 0.38 ± 0.01 at 1.1 GPa) suggest that Br-release from a basalt into volatiles that have no bonding affinity with Br is weak. This should be the case for dry intra-plate volcanic eruptions. From the experimentally gained partition coefficients and from global Br concentration values in melt inclusions of arc magmas, we calculated an annual global Br flux of 23.5–72.9 × 109 g/y.

10.1016/j.chemgeo.2023.121869

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Citations (1)