Laboratory diffractometer-based XAFS spectrometer

Shuvaev, A. T.; Helmer, B. Yu.; Lyubeznova, T. A.; Shuvaeva, V. A.

doi:10.1107/s0909049599001879

Cited by 13 publications

(6 citation statements)

References 4 publications

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“…By contrast, and with only rare exceptions in the last 20 years, 'routine' hard x-ray XAFS [49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64] and high-resolution XES [65][66][67][68][69][70] can only be performed at the synchrotron light sources.…”

Section: Introductionmentioning

confidence: 99%

A laboratory-based hard x-ray monochromator for high-resolution x-ray emission spectroscopy and x-ray absorption near edge structure measurements

Seidler

Mortensen

Remesnik

et al. 2014

Review of Scientific Instruments

140

160

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We report the development of a laboratory-based Rowland-circle monochromator that incorporates a low power x-ray (bremsstrahlung) tube source, a spherically-bent crystal analyzer (SBCA), and an energy-resolving solid-state detector. This relatively inexpensive, introductory level instrument achieves 1-eV energy resolution for photon energies of ~5 keV to ~10 keV while also demonstrating a net efficiency previously seen only in laboratory monochromators having much coarser energy resolution. Despite the use of only a compact, air-cooled 10 W xray tube, we find count rates for nonresonant x-ray emission spectroscopy (XES) comparable to those achieved at monochromatized spectroscopy beamlines at synchrotron light sources. For xray absorption near edge structure (XANES), the monochromatized flux is small (due to the use of a low-powered x-ray generator) but still useful for routine transmission-mode studies of concentrated samples. These results indicate that upgrading to a standard commercial highpower line-focused x-ray tube or rotating anode x-ray generator would result in monochromatized fluxes of order 10 6 -10 7 photons/s with no loss in energy resolution. This work establishes core technical capabilities for a rejuvenation of laboratory-based hard x-ray spectroscopies that could have special relevance for contemporary research on catalytic or electrical energy storage systems using transition-metal, lanthanide or noble-metal active species.

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Section: Introductionmentioning

confidence: 99%

A laboratory-based hard x-ray monochromator for high-resolution x-ray emission spectroscopy and x-ray absorption near edge structure measurements

Seidler

Mortensen

Remesnik

et al. 2014

Review of Scientific Instruments

140

160

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“…In the photographs obtained by dye method, the palm yellow or red zone represents the constituent of ferrite, the blue represents the carbide-free bainite, and the white represents the retained austenite or martensite because they are difficult to be etched. The volume fraction of retained austenite also determines by X-ray diffractometer with the diffraction peak integral intensity of {220},{311} crystal plane ( Ref 14,15). The conversion ratio X can be calculated by…”

Section: Methodsmentioning

confidence: 99%

The Structure Stability of Carbide-Free Bainite Wheel Steel

Ming-ru

Qian

2007

J. of Materi Eng and Perform

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Metallographic structures of carbide-free bainite steel wheel rim are mainly composed of supersaturated lath ferrite and retained austenite film among bainitic ferrite laths. It is suspected that supersaturated ferrite and retained austenite are likely to decompose under the influence of temperature change and mechanical stress. Stability of wheel rim structure is studied by means of x-ray diffraction, dye microscopy, and micro-hardness test. When the samples are tempered in the range of 150-350°C, the retained austenite films are at the state of relative stability. Fifty percent of retained austenite is decomposed when the sample is tempered at 400°C. Microhardness increases when the sample is tempered at 150°C. The decrease in hardness is mild when the samples are tempered from 200 to 500°C. The mechanical stability of retained austenite film is studied with tensile sample under the effect of tensile stress. The retained austenite appears to be stable in low and middle degree of deformation, and decomposition occurs at great amount of deformation. Diffraction peak of carbide is not found in all above experiments. The steel enriched silicon prevents the carbide precipitation during the transformation. It indicates the carbide-free bainite wheel steels have an excellent thermal and mechanical stability.

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“…EXAFS measurements of the Cu K- and Se K-edges were carried out with a laboratory XAFS spectrometer (Shuvaev et al , 1999) with X-ray tube BSV29-Ag (17 kV, 30 mA). A focusing SiO 2 (13 0) d=1.1806 Å for Cu K-edge and SiO 2 (1230) d=0.805 Å for Se K-edge crystal monochromators were used.…”

Section: Methodsmentioning

confidence: 99%

XRD and EXAFS studies of azomethynic copper metallochelates as models of blue copper proteins

et al. 2004

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The structure of two biomimetic copper complexes bis[4-benzylaldimino-3-methyl-1-phenyl-5-thio (seleno)pyrazolato]copper(II)—36 32N6X2Cu (where X=S, Se) have been studied and X-ray patterns of these compounds have been prepared using the Rietveld refinement technique. Both complexes crystallized in a monoclinic lattice, space group-C2/c(15). The unit-cell parameters are a=28.917(3) Å; b=7.000(2) Å; c=17.550(4) Å; β=106.869(1) (1) for C36H32CuN6S2 and a=29.126(6) Å; b=7.042(4) Å; c=17.228(2) Å; β=105.587(2) for C36H32CuN6Se2. Analysis of the copper and selenium K-edge X-ray absorption spectra (EXAFS) of these complexes show that a copper atom is in pseudo-tetrahedric ligand environment N2X2 with typical Cu–N bonds (R=2.00–2.01 Å) and significantly different Cu–S and Cu–Se bonds (R=2.27 Å and R=2.41 Å, respectively) because of different sulfur and selenium ion radii. © 2004 International Centre for Diffraction Data.

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Laboratory diffractometer-based XAFS spectrometer

Cited by 13 publications

References 4 publications

A laboratory-based hard x-ray monochromator for high-resolution x-ray emission spectroscopy and x-ray absorption near edge structure measurements

A laboratory-based hard x-ray monochromator for high-resolution x-ray emission spectroscopy and x-ray absorption near edge structure measurements

The Structure Stability of Carbide-Free Bainite Wheel Steel

XRD and EXAFS studies of azomethynic copper metallochelates as models of blue copper proteins

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