X-ray absorption fine structure (XAFS) is a powerful technique used to analyze local electronic structure, atomic and structural dynamics. In this review, I present examples of XAFS that apply the dynamics functional materials: (1) phase transition in perovskite PbTiO3 magnetic FeRhPd alloys; (2) nano-scaled fluctuations related their properties Ni–Mn alloys Fe/Cr thin films; (3) Debye–Waller f...

The local structure and thermal stability of newly synthesized PdRuIr PdRu alloy nanoparticles (NPs) were studied using X-ray absorption fine spectroscopy (XAFS) compared with those Ru NPs. Pd K-edge XAFS reveals that a significant fraction segregates, forming metal NP clusters. In the NPs, small forms an Ir, whereas majority phase is Ru–Ir having novel face-centered cubic structure. Apart from...

A tapered undulator beamline BL36XU was constructed at SPring-8 to conduct structural and electronic analysis of dynamic events on polymer electrolyte fuel cell (PEFC) cathode catalysts for the development of next-generation PEFCs. BL36XU provides various time and spatially resolved XAFS techniques in an energy range from 4.5 to 35 keV for investigating PEFCs under the operating conditions. In ...

We are currently constructing a new X-ray absorption fine structure (XAFS) beamline BL36XU at SPring-8 dedicated for the structural and electronic analysis of the dynamic events on polymer electrolyte fuel cell (PEFC) cathode catalysts for the development of next-generation PEFCs. To investigate the cathode catalyst nanoparticles in PEFCs under the operating conditions, the beamline is designed...

We have clarified the adsorption and release mechanism of hydrogen to/from Pt clusters on an MCM-41 surface by using the XAFS technique. After reduction, the icosahedral Pt13 cluster of r(Pt-Pt) =0.273 nm is formed. In contrast, a very small oxidized metal particle of r(Pt-Pt) = 0.254 nm is formed after the oxidation. We have measured time-resolved energy dispersive XAFS in order to clarify the...

The ligand substitution reaction, Pd L(3,2,1)-edge and S K-edge x-ray absorption fine structure (XAFS), XAFS simulations, and valence-band and core-level x-ray photoelectron spectroscopy (XPS) have been used to systematically study the surface chemical and electronic properties of wet-chemically prepared Pd nanoparticles of varied size, molecular capping, and metal composition. It was found tha...

The local environment and oxidation state of the Fe impurity in strontium titanate are studied using XAFS spectroscopy. influence annealing temperature deviation from stoichiometry on possibility incorporation into A B sites perovskite structure is studied. results obtained X-ray diffraction, XANES spectra, EXAFS spectra suggest that at high iron atoms, least partially (up to 30%), enter SrTiO ...

The new instrument based on the dispersive optics for the X-ray absorption fine structure (XAFS) was developed at BL-5 of the SR Center. The vertical axis of the synchrotron radiation is used to disperse the X-ray energy in the newly developed instrument, named vertically dispersive XAFS (VDXAFS) instrument. The vertical energy dispersion is achieved using a cylindrical polychromator, and the h...

Abstract We characterized the optical and electronic properties of chalcopyrite-type Cu(Al,In)Se 2 , which is a candidate for wide-bandgap solar cell materials. The bandgap energy was determined from diffuse reflectance spectra. increased 1.00 eV CuInSe to 2.61 CuAlSe with an increase in Al content. ionization corresponding levels valence band maximum (VBM) using photoemission yield spectroscop...