X-ray fluorescence holography studies for a Cu3Au crystal

Dąbrowski, Karol; Dul, D. T.; Jaworska–Gołąb, Teresa; Rysz, Jakub; Korecki, P.

doi:10.1016/j.nimb.2015.05.035

Cited by 3 publications

(1 citation statement)

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“…By tuning the X-ray energy for excitation and detection, one particular element is selectively characterized in an object that includes multiple elements. The feasibility of element-specific characterization of materials has been demonstrated in superconductors, alloys, − and topological insulators . The local structure around metal cations in perovskite-structured metal oxides, SrTiO 3 and Pb(Mg 1/3 Nb 2/3 )O 3 , were analyzed.…”

Section: Resultsmentioning

confidence: 99%

Single-Crystal Model of Highly Efficient Water-Splitting Photocatalysts: A KTaO₃ Wafer Doped with Calcium Cations

et al. 2020

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Alkali tantalates, NaTaO3 and KTaO3, are known as highly efficient semiconductor photocatalysts for the overall water-splitting reaction when properly doped with foreign metal cations. Characterizing surface reaction sites is needed for further development. In this study, (001)-oriented KTaO3 wafers were doped with Ca cations thorough a solid-state reaction to provide platforms for surface science studies. X-ray diffraction showed a Ca-rich perovskite-structured surface layer that covers the Ca-poor or pristine KTaO3 substrate. The lattice of the surface layer was contracted and rotated relative to the substrate lattice. The heteroepitaxial junction of the surface layer on the substrate mimicked the core–shell structure that is found in real photocatalyst particles. Nanometer-scale islands spontaneously appeared on the surface to correct the lattice mismatch across the surface–substrate junction. X-ray fluorescence holography was applied to determine the local, atom-scale structure around Ca cations in the host lattice. Atom distributions reconstructed from Ca Kβ fluorescence holograms suggested that K and Ta cations were simultaneously exchanged with Ca cations. Local lattice deformation was quantitatively deduced around the Ca cations occupying the two different sites. The major features of real photocatalystsheteroepitaxial surface–bulk junctions, surface restructuring to correct lattice mismatches, and simultaneous cation exchangewere reproduced in the doped wafers. The ability of X-ray fluorescence holography to determine a local structure around doping cations was also demonstrated.

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Section: Resultsmentioning

confidence: 99%

Single-Crystal Model of Highly Efficient Water-Splitting Photocatalysts: A KTaO₃ Wafer Doped with Calcium Cations

et al. 2020

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High-pressure neutron diffraction study of Pd3Fe

Ridley

Bull

Funnell

et al. 2019

Journal of Applied Physics

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High-pressure neutron diffraction data from powder and single-crystal samples of atomically disordered (Fm3m) and ordered (Pm3m) Pd 3 Fe were collected up to pressures of 15 GPa, and high-pressure SQUID magnetometry data were collected up to 6 GPa. The data show a subtle decrease in the magnetic moment with applied pressure, resulting in a transition to a paramagnetic state by approximately 8 GPa at 300 K. Diffraction results have been used to determine the equation of state, resulting in a bulk modulus of 176.78(9) GPa for the disordered powder and 187.96(7) GPa for the ordered single-crystal samples respectively, approximately 20% more compressible than previously reported from X-ray measurements. High-temperature SQUID magnetometry was used to confirm the ambient pressure Curie temperature of the sample (545 K), which was further investigated using high-temperature single-crystal neutron diffraction at ambient pressure.

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X-ray Fluorescence Holography: Principles, Apparatus, and Applications

Hayashi

Korecki

2018

J. Phys. Soc. Jpn.

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X-ray fluorescence holography studies for a Cu3Au crystal

Cited by 3 publications

References 24 publications

Single-Crystal Model of Highly Efficient Water-Splitting Photocatalysts: A KTaO₃ Wafer Doped with Calcium Cations

Single-Crystal Model of Highly Efficient Water-Splitting Photocatalysts: A KTaO₃ Wafer Doped with Calcium Cations

High-pressure neutron diffraction study of Pd3Fe

X-ray Fluorescence Holography: Principles, Apparatus, and Applications

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X-ray fluorescence holography studies for a Cu3Au crystal

Cited by 3 publications

References 24 publications

Single-Crystal Model of Highly Efficient Water-Splitting Photocatalysts: A KTaO3 Wafer Doped with Calcium Cations

Single-Crystal Model of Highly Efficient Water-Splitting Photocatalysts: A KTaO3 Wafer Doped with Calcium Cations

High-pressure neutron diffraction study of Pd3Fe

X-ray Fluorescence Holography: Principles, Apparatus, and Applications

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Product

Resources

About

Single-Crystal Model of Highly Efficient Water-Splitting Photocatalysts: A KTaO₃ Wafer Doped with Calcium Cations

Single-Crystal Model of Highly Efficient Water-Splitting Photocatalysts: A KTaO₃ Wafer Doped with Calcium Cations