Self-aligned nanostructures (SAN) made by reacting Co nanoparticles with crystalline Si substrates at high temperatures were studied with grazing incidence X-ray absorption spectroscopy (GI-XAS). The results from extended X-ray absorption fine structure (EXAFS) analysis and X-ray absorption near-edge spectroscopy (XANES) were used to identify SAN as crystalline CoSi2. Theoretical calculations o...

An in-situ EXAFS method is developed to study the nucleation and growth processes of nanocrystals by using a microfluidic reactor which converts the time-dependent kinetics to position-dependence. As an example, we measured the Se K-edge EXAFS spectra for CdSe nanocrystals along a microfluidic reactor channel and indicated strong timedependence of the nucleation and growth at the beginning of t...

The anhamtonic effective pair potentials ~(u)=au~~+~u~/3!+yu~/4! in K& and CsBr have been investigated at room temperature by the EXAFS technique. In the parameter fitting, we have directly carried out the numerical integration of EXAFS function and evaluated the anharmonic effective pair potential. The Griineisen parameters y, were calculated from the obtained values of a and 6 as 1.65 for KBr...

Local structures around Mn in In12xMnxAs films grown by molecular-beam epitaxy have been studied by using Mn K-edge extended x-ray-absorption fine-structure ~EXAFS! technique. Substitution of Mn atoms for the In sites is found in samples either grown at low substrate temperatures ~near 200 °C! or with a low Mn concentration ~about 1 at. %!. This result represents a significant extension of an e...

The local structure of In2O3 cosubstituted with Zn and Sn (In2 2xSnxZnxO3, xr0.4 or ZITO) was determined by extended X-ray absorption fine structure (EXAFS) for x=0.1, 0.2, 0.3 and 0.4. The host bixbyite In2O3 structure is maintained up to the enhanced substitution limit (x=0.4). The EXAFS spectra are consistent with random substitution of In by the smaller Zn and Sn cations, a result that is c...

Occupied sites by dopants of Ag(O.lat%). Pd(Zat%) and Zr(OAat%) in the Ni3AI intermetallic compound are investigated by means of EXAFS analysis. It is found that Pd substitutes the Ni site and Zr substitutes the A1 site. These results are consistent with tthose of channeling enhanced microanalysis. Ag is also determined to substitute in the Ni site by EXAFS and this result supports that Ag addi...

No. Conr0232 Planar Oxides as a Novel Approach to Understanding Metal Ion Sorption to Natural Oxide Surfaces: An EXAFS Investigation of Pb(II) Sorption to Gamma Alumina Surfaces M. Kelley (College of William & Mary/TJNAF), C. Chisholm-Brause (W&M), C. Conrad (W&M) Beamline(s): X11A Introduction: This work introduces planar oxides as a novel approach to understanding metal-ion interactions with ...

The short-range structures of molten alkali actinide fluoride salts were studied using in situ EXAFS combined with molecular dynamics simulations.