Structural Dynamics of Materials Probed by X-Ray Photon Correlation Spectroscopy

Madsen, Anders; Fluerasu, Andrei; Ruta, Beatrice

doi:10.1007/978-3-319-04507-8_29-2

Cited by 22 publications

(38 citation statements)

References 98 publications

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“…Figure 1a shows the normalized intensity autocorrelation function g 2 (Q,t) of SiO 2 at T=295 K and for a wave-vector Q p =1.5 Å -1 corresponding to the position of the maximum in the structure factor. The function g 2 (Q,t) is directly related to the density fluctuations in the material and thus provides information on its relaxation dynamics 15 . Lines in the figure are fits using the Kohlrausch-Williams-Watts function g 2 (Q,t)=1+c ·exp(-2(t/τ) β ), where c contains information on the experimental contrast and the nonergodicity factor of the glass, β describes the shape of the curve, and τ is the characteristic decay time 15 .…”

Section: Resultsmentioning

confidence: 99%

“…The function g 2 (Q,t) is directly related to the density fluctuations in the material and thus provides information on its relaxation dynamics 15 . Lines in the figure are fits using the Kohlrausch-Williams-Watts function g 2 (Q,t)=1+c ·exp(-2(t/τ) β ), where c contains information on the experimental contrast and the nonergodicity factor of the glass, β describes the shape of the curve, and τ is the characteristic decay time 15 . Surprisingly the correlation functions of vitreous silica display a full decorrelation to zero, even at ambient temperature, thus a temperature that is only 20% of the glass transition temperature T g , in agreement with previous results for silicate glasses 19,20 .…”

Section: Resultsmentioning

confidence: 99%

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Hard X-rays as pump and probe of atomic motion in oxide glasses

Ruta

Zontone

Chushkin

et al. 2017

Sci Rep

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Nowadays powerful X-ray sources like synchrotrons and free-electron lasers are considered as ultimate tools for probing microscopic properties in materials. However, the correct interpretation of such experiments requires a good understanding on how the beam affects the properties of the sample, knowledge that is currently lacking for intense X-rays. Here we use X-ray photon correlation spectroscopy to probe static and dynamic properties of oxide and metallic glasses. We find that although the structure does not depend on the flux, strong fluxes do induce a non-trivial microscopic motion in oxide glasses, whereas no such dependence is found for metallic glasses. These results show that high fluxes can alter dynamical properties in hard materials, an effect that needs to be considered in the analysis of X-ray data but which also gives novel possibilities to study materials properties since the beam can not only be used to probe the dynamics but also to pump it.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Hard X-rays as pump and probe of atomic motion in oxide glasses

Ruta

Zontone

Chushkin

et al. 2017

Sci Rep

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“…However, there are limitations in terms of q range and concentrations which can be studied, especially when the sample becomes turbid. With the advent of third generation synchrotron sources, XPCS has emerged as an alternative method for probing the equilibrium dynamics in such systems [9,[103][104][105]. The XPCS technique exploits the coherence properties of the X-ray beam and the measured scattering patterns display speckles as shown in Figure 12.…”

Section: Equilibrium Dynamicsmentioning

confidence: 99%

“…The XPCS can be performed in both SAXS and WAXS configurations. The wide-angle XPCS provides access to atomic dynamics in relatively slow systems such as supercooled liquids and molecular glasses [104,105]. Recent studies of atomic dynamics include aging behavior of metallic glasses [107] and beam induced dynamics of oxide glasses [108].…”

Section: Equilibrium Dynamicsmentioning

confidence: 99%

“…This readily allows obtaining the ensemble averaged g 2 (q, t) of these non-ergodic systems. In addition, the two time correlation function, g 2 (q, t 1 , t 2 ), can be used to visualize the ageing behavior of the system as a function of time [3,105]. A common feature of these systems is hyperdiffusive dynamics characterized by a compressed exponential decay of g 2 (q, t) [9,105].…”

Section: Equilibrium Dynamicsmentioning

confidence: 99%

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Synchrotron Scattering Methods for Nanomaterials and Soft Matter Research

Narayanan

Konovalov

2020

Materials

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This article aims to provide an overview of broad range of applications of synchrotron scattering methods in the investigation of nanoscale materials. These scattering techniques allow the elucidation of the structure and dynamics of nanomaterials from sub-nm to micron size scales and down to sub-millisecond time ranges both in bulk and at interfaces. A major advantage of scattering methods is that they provide the ensemble averaged information under in situ and operando conditions. As a result, they are complementary to various imaging techniques which reveal more local information. Scattering methods are particularly suitable for probing buried structures that are difficult to image. Although, many qualitative features can be directly extracted from scattering data, derivation of detailed structural and dynamical information requires quantitative modeling. The fourth-generation synchrotron sources open new possibilities for investigating these complex systems by exploiting the enhanced brightness and coherence properties of X-rays.

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Nanoscale Ion Dynamics Control on Amorphous Calcium Carbonate Crystallization: Precise Control of Calcite Crystal Sizes

et al. 2020

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Amorphous calcium carbonate (ACC) is an essential component present during the early stages of biomineralization of many calcifying organisms, which is used as a precursor of crystalline calcium carbonate phases. Here, we performed X-ray photon correlation spectroscopy experiments on ACC which show that the amount of adsorbed water has a strong control over its diffusive dynamics. Results of crystallization experiments under conditions of controlled humidity indicate that the adsorbed water is enough to spark crystallization of calcite. A direct proportionality is found between the relative humidity of the environment and the final size of the calcite crystals. Different hypotheses are made to explain this result, with the confinement within the amorphous matrix being the main suspect of controlling the size of the crystallites. Control of water activity and water content is, therefore, a possible way to regulate biomineral crystallinity both in nature and for the design of functional biomimetic materials.

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Structural Dynamics of Materials Probed by X-Ray Photon Correlation Spectroscopy

Cited by 22 publications

References 98 publications

Hard X-rays as pump and probe of atomic motion in oxide glasses

Hard X-rays as pump and probe of atomic motion in oxide glasses

Synchrotron Scattering Methods for Nanomaterials and Soft Matter Research

Nanoscale Ion Dynamics Control on Amorphous Calcium Carbonate Crystallization: Precise Control of Calcite Crystal Sizes

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