X-ray absorption in dispersive mode: A new spectrometer and a data acquisition system for fast kinetics

Dartyge, E.; Depautex, C.; Dubuisson, J.; Fontaine, A.; Jucha, A.; Leboucher, P.; Tourillon, G.

doi:10.1016/0168-9002(86)90131-2

Cited by 120 publications

(35 citation statements)

References 7 publications

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“…However, the detailed mechanism about the formation of metal nanoclusters on metal oxide surfaces under ''in situ'' conditions remains unclear. Time-resolved energy-dispersive XAFS (DXAFS) analysis is a powerful method to observe the structural changes in situ [13][14][15]. Recently, some groups reported the DXAFS studies on kinetics and dynamics of catalysis in several synchrotron radiation sources in the world [16].…”

Section: Introductionmentioning

confidence: 99%

In Situ Time-Resolved Energy-Dispersive XAFS Study on Reduction Behavior of Pt Supported on TiO2 and Al2O3

et al. 2009

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The dynamic reduction behavior of a highly dispersed Pt 4? to Pt 0 particles on TiO 2 and Al 2 O 3 surfaces under the reductive atmosphere with an in situ timeresolved energy-dispersive X-ray absorption fine structure (DXAFS) analysis. A highly dispersed Pt 4? on TiO 2 was reduced to Pt 0 even at room temperature. In contrast, a highly dispersed Pt 4? on Al 2 O 3 was gradually reduced to Pt 0 even at 473 K. This result may suggest that the semiconductive behavior of TiO 2 promotes the low temperature adsorption of hydrogen and supply of hydrogen atom to Pt 4? to be reduced and the activation of hydrogen on Al 2 O 3 requires high temperature.

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Section: Introductionmentioning

confidence: 99%

In Situ Time-Resolved Energy-Dispersive XAFS Study on Reduction Behavior of Pt Supported on TiO2 and Al2O3

et al. 2009

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“…For diffraction, three independent experiments were carried out on the DW-11 energy dispersive X-ray diffraction beamline on the DCI ring of the LURE synchrotron facility in Orsay, France, using argon and silicone oil as pressure transmitting media, and ruby fluorescence as a pressure gauge. XAS was performed on the D11 dispersive XAS [20,21] beamline at both Ga and As K edges using silicone oil as the pressure transmitting medium.…”

mentioning

confidence: 99%

A combined XAS and XRD study of the high-pressure behaviour of GaAsO ₄ berlinite

Badro¹,

Gillet²,

McMillan³

et al. 1997

Europhys. Lett.

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(received ; accepted ) PACS. 62.50+p -High Pressure. PACS. 61.10−i -X-ray diffraction. PACS. 61.10Lx -X-ray absorption spectroscopy.Abstract. -Combined X-ray absorption spectroscopy (XAS) and X-ray diffraction (XRD) experiments have been carried out on α − GaAsO4 (berlinite structure) at high pressure and room temperature. XAS measurements indicate four-fold to six-fold coordination changes for both cations. The two local coordination transformations occur at different rates but appear to be coupled. A reversible transition to a high pressure crystalline form occurs around 8 GPa. At a pressure of about 12 GPa, the system mainly consists of octahedral gallium atoms and a mixture of arsenic in four-fold and six-fold coordinations. A second transition to a highly disordered material with both cations in six-fold coordination occurs at higher pressures and is irreversible.Introduction. -The mineral quartz (α − SiO 2 ) and its ordered AlP O 4 (berlinite) analogue form archetypal tetrahedral framework structures taken by many compounds (GeO 2 , GaP O 4 , GaAsO 4 , AlAsO 4 ) which exhibit phase transformations under high pressure. At room temperature, the kinetics of these pressure-induced transitions are slow and metastable crystal-to-crystal (C-C) transitions or pressure-induced amorphization (PIA) processes are observed [1,2,3,4,5,6]. The room temperature compression behaviour and PIA of α − GeO 2 was studied previously by X-ray diffraction and X-ray absorption spectroscopy (XAS) [7]. The results showed that the germanium coordination rises from four to six through the high pressure transformation. Molecular dynamics (MD) simulations [8,9,10,11,12,13,6,14] on SiO 2 quartz indicate that the PIA is also associated with a coordination change.In the case of quartz-like berlinites, it was first thought that α − AlP O 4 exhibited the same room temperature and high pressure behaviour as quartz, and underwent PIA at 15 GPa

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“…The correlation between position and energy of the X-ray is exploited thanks to a position sensitive detector. This method was adapted at LURE on the D11 beamline as early as 1981 [16] and fully opened to users from 1985 to 2003. The dispersive set-up has been upgraded twice; the last upgrade was completed in 1996 with the ambition of building a competitive experiment, to be transferred at SOLEIL.…”

Section: The Ode Beamlinementioning

confidence: 99%

“…It should be remarked that the SOLEIL bending magnet sources also presented in Figure 1 will be as good as the ESRF ones up to about 15 keV with a maximum brilliance of 10 16 in standard units at 10 keV.…”

Section: Introductionmentioning

confidence: 99%

Soleil a New Powerful Tool for Materials Science

Baudelet

Belkhou

Briois

et al. 2005

Oil & Gas Science and Technology - Rev. IFP

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Résumé -SOLEIL, un nouvel outil puissant pour les sciences des matériaux -À l'aube des premiers photons disponibles sur l'anneau synchrotron de troisième génération SOLEIL, un état des possibilités offertes en sciences des matériaux sera présenté. La brillance exceptionnelle de cette machine permettra de réduire de plusieurs ordres de grandeur les temps d'acquisition typiques des différentes techniques synchrotrons (spectroscopie d'absorption-EXAFS, diffusion X aux petits et grands angles-SAXS et WAXS, diffraction des rayons X -XRD, spectroscopies et microscopie de photoélectrons -XPS et PEEM, etc.) les transformant en véritables techniques operando pour la caractérisation des matériaux et plus particulièrement des catalyseurs. La résolution spatiale à l'échelle de quelques microns et même submicronique, accessible par microdiffraction et microspectroscopie dans un domaine s'étendant de l'IR lointain aux X durs, pourra être mise à profit pour réaliser une cartographie atomiquement sélective de matériaux, du catalyseur hétérogène en action aux roches réservoirs. Un ensemble de techniques in situ permettra d'accéder à la réactivité de surfaces et de nanoparticules exposées à des flux gazeux contrôlés. La combinaison des techniques synchrotrons (diffraction, absorption et fluorescence X, etc.) ou l'apport d'informations complémentaires par combinaison simultanée de techniques classiques (Raman, UV-Vis, etc.) avec les techniques du synchrotron seront enfin un atout majeur pour la caractérisation operando des matériaux.Abstract -SOLEIL a New Powerful Tool for Materials Science -The first photons delivered by the third generation synchrotron source SOLEIL will be soon available for the scientific community. In this context, this paper presents an overview of the potentialities offered by this new machine for the study of materials. The outstanding brilliance of the SOLEIL source will enable to reduce by several orders of magnitude the data collection time for most of the synchrotron techniques (X-ray absorption spectroscopy -EXAFS, wide and small angle X-ray scattering -WAXS and SAXS, X-ray diffraction -XRD, photoelectron spectroscopy and microscopy-XPS and PEEM, etc.)

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X-ray absorption in dispersive mode: A new spectrometer and a data acquisition system for fast kinetics

Cited by 120 publications

References 7 publications

In Situ Time-Resolved Energy-Dispersive XAFS Study on Reduction Behavior of Pt Supported on TiO2 and Al2O3

In Situ Time-Resolved Energy-Dispersive XAFS Study on Reduction Behavior of Pt Supported on TiO2 and Al2O3

A combined XAS and XRD study of the high-pressure behaviour of GaAsO ₄ berlinite

Soleil a New Powerful Tool for Materials Science

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X-ray absorption in dispersive mode: A new spectrometer and a data acquisition system for fast kinetics

Cited by 120 publications

References 7 publications

In Situ Time-Resolved Energy-Dispersive XAFS Study on Reduction Behavior of Pt Supported on TiO2 and Al2O3

In Situ Time-Resolved Energy-Dispersive XAFS Study on Reduction Behavior of Pt Supported on TiO2 and Al2O3

A combined XAS and XRD study of the high-pressure behaviour of GaAsO 4 berlinite

Soleil a New Powerful Tool for Materials Science

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A combined XAS and XRD study of the high-pressure behaviour of GaAsO ₄ berlinite