Olivier Mathon

European Synchrotron Radiation Facility

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Co-Authors

S. Pascarelli

European X-Ray Free-Electron Laser

Tetsuo Irifune

Ehime University

A. D. Rosa

European Synchrotron Radiation Facility

Manuel Muñoz

Centre National de la Recherche Scientifique

Giuliana Aquilanti

Elettra-Sincrotrone Trieste S.C.p.A.

R. Torchio

European Synchrotron Radiation Facility

Gastón Garbarino

European Synchrotron Radiation Facility

I. Kantor

Aarhus University

J. P. Itié

Synchrotron soleil

Agnès Dewaele

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Cooperative Institutions

Centre National de la Recherche Scientifique

115

Sorbonne Université

European Synchrotron Radiation Facility

Institut de Recherche pour le Développement

Institut de minéralogie, de physique des matériaux et de cosmochimie

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Université Grenoble Alpes

Université Paris Cité

Université Paris-Saclay

European Science Foundation

Author Statistics

Papers

Citation

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Synchrotron studies on silicon clathrates: Highly stable nanostructured materials

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms (2005)

A. San Miguel P. Toulemonde Alexandre Merlen Bruno Masenelli Florent Tournus

Clathrate hydrate

XANES

Diamond anvil cell

10.1016/j.nimb.2005.06.040

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Citations (1)

New opportunities for high pressure X-ray absorption spectroscopy using dispersive optics

Journal of Alloys and Compounds (2003)

S. Pascarelli Olivier Mathon Giuliana Aquilanti

X-ray absorption spectroscopy

Diamond anvil cell

X-Ray Spectroscopy

10.1016/s0925-8388(03)00559-0

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Citations (48)

The α → ω phase transformation in zirconium followed with ms-scale time-resolved X-ray absorption spectroscopy

High Pressure Research (2016)

Agnès Dewaele Rémi F. André F. Occelli Olivier Mathon S. Pascarelli

The conditions of the pressure-induced α→ω phase transformation in zirconium have been reported to be influenced by the sample purity, the pressurizing conditions, and the deformation rate. Here, we study this transformation using a dynamic diamond-anvil cell compression setup and ms-scale time-resolved X-ray absorption spectroscopy. The sample pressure is also monitored at the same timescale using the ruby luminescence method. For the samples used in this study (polycrystal of 99.9+ purity, hydrostatically compressed in neon pressure transmitting medium), the phase transformation pressure is very close in static (11 GPa) and in dynamic (12±1 GPa) compression and the transformation is achieved in less than a few ms at 12 GPa. Comparison with literature studies suggest that the kinetics and the mechanism of this martensitic phase transformation are different under hydrostatic and non-hydrostatic compression.

Diamond anvil cell

Hydrostatic pressure

Hydrostatic equilibrium

Diffusionless transformation

10.1080/08957959.2016.1199692

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Citations (14)

Structural and electronic transformations of GeSe ₂ glass under high pressures studied by X-ray absorption spectroscopy

Proceedings of the National Academy of Sciences (2024)

Emin Mijit Murat Durandurdu João Elias F. S. Rodrigues A. Trapananti S. J. Rezvani

Pressure-induced transformations in an archetypal chalcogenide glass (GeSe

X-ray absorption spectroscopy

Coordination number

XANES

Chalcogen

Chalcogenide glass

Absorption edge

10.1073/pnas.2318978121

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Citations (2)

XAS and XMCD spectroscopies to study matter at high pressure: Probing the correlation between structure and magnetism in the 3d metals

Coordination Chemistry Reviews (2014)

R. Torchio Olivier Mathon S. Pascarelli

Magnetism

X-ray absorption spectroscopy

Diamond anvil cell

10.1016/j.ccr.2014.02.024

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Citations (31)

Germanium Crystal Chemistry in Cu-Bearing Sulfides from Micro-XRF Mapping and Micro-XANES Spectroscopy

Minerals (2019)

Rémi Belissont Manuel Muñoz Marie‐Christine Boiron Béatrice Luais Olivier Mathon

Germanium is considered a critical element, with a demand that has sharply increased due to booming high-technology industries. To understand Ge incorporation mechanisms in natural systems, we investigate Ge speciation in Cu-bearing sulfide minerals using synchrotron X-ray fluorescence (XRF) chemical mapping and Ge K-edge µ-X-ray absorption near-edge structures (µ-XANES) spectroscopy. The samples investigated include (i) a homogeneous chalcopyrite from the Kipushi polymetallic deposit (Central African copperbelt, D.R. Congo) and (ii) a zoned Ge-rich chalcopyrite from the Barrigão Cu deposit (Iberian pyrite belt, Portugal). First, our spectroscopic analysis supports the occurrence of tetrahedrally-coordinated Ge4+ in chalcopyrite, independently from origins or zoning patterns observed for these minerals. Then, based on statistical analyses of XRF chemical maps, we demonstrate that tetravalent germanium most likely incorporates chalcopyrite through the Fe crystallographic site via coupled substitutions with the following form: (2x + 3y)Fe3+ ⟷ (x + 2y)(Ge,Sn)4+ + x(Zn,Pb)2+ + y(Cu,Ag)+, although the presence of lattice vacancies cannot be completely excluded.

XANES

X-ray absorption spectroscopy

X-Ray Spectroscopy

Copper sulfide

10.3390/min9040227

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Citations (27)

Sorption model for yttrium in fluorapatite: Geochemical implications

Geochemical Perspectives Letters (2023)

Clément Bonnet Manuel Muñoz Olivier Mathon Vincent Motto‐Ros Abdellatif Elghali

Fluorapatite (FAp), which occurs in various geological settings, contains rare earth elements (REE) for which unveiling the crystal chemistry is a key geochemical issue, especially for unravelling the conditions of fractionation and crystallisation.However, no consensus has been reached regarding their binding modes in FAp, with studies suggesting REE 3þ -Ca 2þ substitution at the Ca(1) site, or at the Ca(2) site, or involving adsorption mechanisms.Our contribution here is based on yttrium K-edge X-ray absorption spectroscopy (XAS), performed on two genetically contrasting minerals: a hydrothermal FAp (from Durango, Mexico), and a sedimentary phosphorite (from Morocco).The results clearly show that Y substitutes for the Ca(2) site in both FAp.However, the spectral differences observed for the sedimentary FAp (B-type carbonated-FAp) suggest a sorption model that is either i) a mixture of Y-Ca( 2) substitution and Y-adsorbed as an inner shell complex, or ii) Y-Ca(2) substitution along with carbonate groups replacing phosphate groups in the surrounding atomic shell.These models of yttrium sorption in FAp shed new light on the understanding of rare earth partitioning and enrichment processes, with major geochemical implications such as i) the identification of crystallising fluids and temperature in magmatic-hydrothermal settings, and ii) preservation of past seawater-porewater conditions in sedimentary settings.

Fluorapatite

10.7185/geochemlet.2326

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Citations (4)

Martensitic fcc-hcp transformation pathway in solid krypton and xenon and its effect on their equations of state

Physical review. B./Physical review. B (2022)

A. D. Rosa Agnès Dewaele Gastón Garbarino Volodymyr Svitlyk G. Morard

The martensitic transformation is a fundamental physical phenomenon at the origin of important industrial applications. However, the underlying microscopic mechanism, which is of critical importance to explain the outstanding mechanical properties of martensitic materials, is still not fully understood. This is because for most martensitic materials the transformation is a fast process that makes in situ studies extremely challenging. Noble solids krypton and xenon undergo a progressive pressure induced fcc to hcp martensitic transition with a very wide coexistence domain. Here, we took advantage of this unique feature to study the detailed mechanism of the transformation by employing in situ X-ray diffraction and absorption. We evidenced a four stages mechanism where the lattice mismatch between the fcc and hcp forms plays a key role in the generation of strain. We also determined precisely the effect of the transformation on the compression behavior of these materials.

Krypton

Diffusionless transformation

10.1103/physrevb.105.144103

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Citations (9)

In situcharacterization of liquid network structures at high pressure and temperature using X-ray absorption spectroscopy coupled with the Paris-Edinburgh press

High Pressure Research (2016)

A. D. Rosa J. Pohlenz C. de Grouchy B. Cochain Yoshio Kono

We review recent progress in studying structural properties of liquids using X-ray absorption spectroscopy coupled with the Paris-Edinburgh press at third-generation synchrotron facilities. This experimental method allows for detecting subtle changes in atomic arrangements of melts over a wide pressure–temperature range. It has been also employed to monitor variations of the local coordination environment of diluted species contained in glasses, liquids and crystalline phases as a function of the pressure and temperature. Such information is of great importance for gaining deeper insights into the physico-chemical properties of liquids at extreme condition, including the understanding of such phenomena as liquid–liquid phase transitions, viscosity drops and various transport properties of geological melts. Here, we describe the experimental approach and discuss its potential in structural characterization on selected scientific highlights. Finally, the current ongoing instrumental developments and future scientific opportunities are discussed.

Characterization

X-ray absorption spectroscopy

10.1080/08957959.2016.1199693

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Citations (9)

A new EXAFS investigation of local structural changes in amorphous and crystalline GeO₂at high pressure

Journal of Physics Condensed Matter (2009)

M. Vaccari Giuliana Aquilanti S. Pascarelli Olivier Mathon

Structural transformations at high pressure in amorphous and quartz-like crystalline GeO(2) have been investigated by using a Paris-Edinburgh press coupled to EXAFS spectroscopy. From both the germanium absorption edge position and the Ge-O distance evolution, new detailed information has been obtained about the pressure behavior of the short range order. Crystalline GeO(2) undergoes a transformation from four- to six-fold coordination at about 8.5 GPa, but at least the whole 6-12 GPa pressure range should be considered as the transition region. On the other hand, amorphous GeO(2) is characterized by a much more gradual structural change and the full octahedral state is not reached at 13 GPa as commonly believed. Furthermore, no support to the recently claimed fully pentahedral intermediate state can be given. EXAFS signals of glassy GeO(2) beyond the first Ge-O shell qualitatively confirm the continuous breakdown of the intermediate range order up to 10 GPa.

X-ray absorption spectroscopy

10.1088/0953-8984/21/14/145403

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Citations (64)