X-ray Bragg Diffraction in a Strong Acoustic Field

Zolotoyabko, E.; Polikarpov, Igor

doi:10.1107/s0021889897008807

Cited by 18 publications

(12 citation statements)

References 25 publications

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“…The structure and phase composition of the treated titanium was identified using XRD (D8 Discover X‐ray diffractometer, Bruker, AXS, Germany) with CuK α radiation ( λ = 1.54178 Å) in the 2 θ range of 30–116° with step 0.02° 2 θ and counting time 2 s. The crystal structure was refined by the Rietveld method; the crystallite size and strain were determined by the Williamson–Hall method with the DIFFRACT plus TOPAS and Xpowder 12 software . The PO of cp‐Ti crystallites was identified with March–Dollase approximation (Table ) …”

Section: Methodsmentioning

confidence: 99%

Characteristics of morphology, structure and composition of titanium surface under its modification by electrochemical polarization in phosphate‐alkaline solutions

Akimov

Tyukhai

Таусон

et al. 2015

Surface & Interface Analysis

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The modification of titanium surface under electrochemical polarization (EP) in the phosphate-alkaline solutions has been studied using the methods of X-ray diffraction, electron probe microanalysis, atomic force microscopy, X-ray photoelectron spectroscopy (XPS), cyclic voltammetry and spectroscopic ellipsometry. It is shown that the morphological parameters of the surface, e.g. roughness and stringiness, as well as its structural-chemical characteristics, e.g. preferred orientation, size and habit of crystallites, titanium chemical forms, thickness and phase composition of oxide film are generally dependent on the polarization potential. The characteristics of titanium surface modified at low anodic potentials 500, 750 and 1000 mV and 10-min polarization time have been measured. The processes of Ti surface dissolution and etching along grain boundaries are found to be most intensive at 750 mV. Under 500 mV, these processes are poorly developed yet, while at 1000 mV, the surface passivating film formation limits the previous processes. Despite relatively low polarization potentials (1 V), the surficial oxide films have sufficient thickness (up tõ 20 nm) and a specific multilayer structure of variable composition and oxidation state of titanium. The data obtained allow to assert that EP represents an effective tool for morphological and a structural chemical modification of a titanium surface.

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Section: Methodsmentioning

confidence: 99%

Characteristics of morphology, structure and composition of titanium surface under its modification by electrochemical polarization in phosphate‐alkaline solutions

Akimov

Tyukhai

Таусон

et al. 2015

Surface & Interface Analysis

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“…Since the pioneering work of Hauer & Burns (1975), a great deal of effort has been devoted to studying the interactions between acoustic waves and X-rays (see e.g. Entin et al, 1990;Roshchupkin & Brunel, 1993;Tucoulou et al, 1997Tucoulou et al, , 1998Tucoulou et al, , 2001Zolotoyabko & Polikarpov, 1998;Sauer et al, 1999;Roshchupkin, Irzhak, Snigirev et al, 2011;Bojahr et al, 2012). One of the main motivations of these studies has been the tailoring of synchrotron light.…”

Section: Introductionmentioning

confidence: 99%

Laboratory X-ray characterization of a surface acoustic wave on GaAs: the critical role of instrumental convolution

et al. 2016

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Surface acoustic waves of micrometre wavelength travelling on a monocrystal give diffraction satellites around each Bragg peak in an X‐ray diffraction diagram. By using a four‐crystal monochromator, a secondary two‐crystal analyser and masks reducing the footprint to the part of the crystal containing the acoustic modulation, it is possible to observe these satellites on a GaAs (001) surface using a laboratory diffractometer. The finite extension of the satellite diffraction rods and of the crystal truncation rod perpendicular to the surface leads to geometrical correction factors when convoluted with the instrumental resolution function, which had previously been ignored. The calculation of these geometrical correction factors in the framework of the kinematic approximation allows the determination of the surface acoustic wave amplitude, and the study of its attenuation and its dependence on radiofrequency power and duty cycle. The ability to perform such determinations with a laboratory diffractometer should prove useful in optimizing surface acoustic waves, which are presently used in a broad range of condensed matter physics studies.

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“…The high sensitivity of X-ray diffraction to dynamic deformation introduced by highfrequency acoustic waves (f = 290 MHz) was published recently [15] including many references about that topic. These experiments were performed to study the limits of dynamic and kinematic diffraction of X-rays and the broadening of the integrated diffraction width caused by photon±phonon interactions.…”

Section: Theory and Discussionmentioning

confidence: 99%

Quantum Beats in Time Resolved X-Ray Interference Experiments

Rode

Jex

2000

phys. stat. sol. (b)

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We have employed LLL-type X-ray interferometers with a splitted mirror crystal and quartz crystals attached aside each mirror. Ultrasound waves of different frequencies f 1 and f 2 around 10 MHz are fed into these mirrors. The ultrasound modulations of the coherently splitted X-ray beams inside the interferometer are analysed in time resolved interference experiments correlating the phase of the phonons with the registration time of the photons. In the interference intensity we observe quantum beat frequencies down to Df = 96 mHz (in energy scale DE = h Df = 397 atto-eV) as well as the two ultrasound frequencies and their overtones mf 1 and nf 2 (m, n = 1, 2, 3) and the sum frequency Sf = f 1 + f 2 .

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X-ray Bragg Diffraction in a Strong Acoustic Field

Cited by 18 publications

References 25 publications

Characteristics of morphology, structure and composition of titanium surface under its modification by electrochemical polarization in phosphate‐alkaline solutions

Characteristics of morphology, structure and composition of titanium surface under its modification by electrochemical polarization in phosphate‐alkaline solutions

Laboratory X-ray characterization of a surface acoustic wave on GaAs: the critical role of instrumental convolution

Quantum Beats in Time Resolved X-Ray Interference Experiments

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