Powder diffraction studies using anomalous dispersion [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy, 1993.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: 25 pages : digital, PDF file
Additional Creators:: Brookhaven National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

With the increasing availability and accessibility of high resolution powder diffractometers at many synchrotron radiation sources throughout the world, there is rapidly-growing interest in the exploitation of anomalous dispersion techniques for structural studies of polycrystalline materials. In conjunction with the Rietveld profile method for structure refinement, such studies are especially useful for the determination of the site distributions of two or more atoms which are near neighbors in the periodic table, or atoms which are distributed among partially occupied sites. Additionally, it is possible to (1) determine the mean-square displacements associated with different kinds of atoms distributed over a single set of sites, (2) distinguish between different oxidation states and coordination geometries of a particular atom in a compound and (3) to determine f` for a wide range of atomic species as a function of energy in the vicinity of an absorption edge. Experimental methods for making anomalous dispersion measurements are described in some detail, including data collection strategies, data analysis and correlation problems, possible systematic errors, and the accuracy of the results. Recent work in the field is reviewed, including cation site-distribution studies (e.g. doped high {Tc} superconductors, ternary alloys, FeCo₂(PO₄)₃, FeNi₂BO₅), oxidation-state contrast (e.g. YBa₂Cu₃O{sub 6+x}, Eu₃O₄, GaCl₂, Fe₂PO₅), and the effect of coordination geometry (e.g. Y₃Ga₅O{sub l2}).

Report Numbers:

E 1.99:bnl--48626
E 1.99: conf-930899--1
conf-930899--1
bnl--48626

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Note:

Published through SciTech Connect.
05/01/1993.
"bnl--48626"
" conf-930899--1"
"DE93012531"
International conference on anomalous scattering,Malente (Germany),15-19 Aug 1993.
Wilkinson, A.P.; Cox, D.E.

Funding Information:

AC02-76CH00016

View MARC record | catkey: 14063216