A differential anomalous x-ray scattering (DAS) study of a three molal aqueous solution of erbium bromide (ErBr3) is reported. X-ray scattering at various energies below the L3 edge of erbium and the K edge of bromine was used to elucidate the ion–ion and the ion–water interaction in this solution and to get more precise information on the local environment of both ions. After an intricate data evaluation procedure the differential atom pair correlation function (DAPCF) and its “negative image” the complement atom pair correlation function (CAPCF), were obtained. The analysis of the DACPF and the CAPCF provides no considerable inner-shell complexing of the cation and the anion, but a well defined and stable hydratation sphere around the triply charged Er3+–ion was found, which is in good agreement with results of conventional x-ray studies, extended x-ray absorption fine structure (EXAFS) measurements and Raman spectroscopy. In addition the analysis provides Er3+–Br1− interaction in the second coordination sphere and an overlap of the hydratation spheres of cat- and anions as well as of two anions. On the basis of these results a two-dimensional model of the ion–ion and the ion–water interaction is presented.
A differential anomalous X-ray scattering (DAS) investigation on gels, produced by hydrolysis of a mixture of lead(I1)acetate and zirconium-and titanium-n-propoxides, and calcinated at the temperatures 200, 300, and 450 "C, is presented. Anomalous X-ray scattering was applied to get more precise information on the structural changes of the gel during calcination. n o different scattering experiments for each sample were performed with synchroton radiation of the energy below the L, edge of lead, namely at 11500 and 13025 eV. The data were corrected for absorption, fluorescence radiation and multiple scattering. The Compton and atomic scattering were subtracted after normalization to absolute units with values for the anomalous dispersion corrections, determined by an absorption experiment. The Fourier transform of the total and differential scattering intensities yields the total and differential atom pair correlation functions (TAPCF, DACPF), which provide information on the local structure of lead and its changes during the calcination process. The analysis of the TAPCF's and DAPCF's indicates a structure, similar to that existing in the pyrochlore or perovskite phase of lead zirconate titanate (PZT), even at low temperatures. By comparison of the corresponding atom pair correlation functions (APCF's) it can be deduced that the near range as well as the long range order in the local environment of lead nearly remains unaltered during the calcination process.
The results of a differential anomalous X‐ray scattering (DAS) study on lead(II)acetate trihydrate, dissolved in 2‐methoxyethanol, are reported. Anomalous X‐ray scattering at two energies below the L3‐edge of lead (Pb) was used to determine the local environment of Pb and to get more precise information on the complex molecular structure of the liquid. The differential scattering intensities and their Fourier transform, the differential atom pair correlation function (DACPF), were obtained after an intricate data evolution procedure. The analysis of the DACPF provides strong evidence for a dimeric structure of lead(II)acetate trihydrate in the methoxyethanolic solution via lead ‐ oxygen ‐ lead correlation.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.