title: From average to local structure: a Rietveld and an atomic pair distribution function (PDF) study of selenium clusters in zeolite-NdY.
abstract: The structure of Se particles in the approximately 13 A diameter alpha-cages of zeolite NdY has been determined by Rietveld refinement and pair distribution function (PDF) analysis of X-ray data. With the diffuse scattering subtracted an average structure comprised of an undistorted framework containing nanoclusters of 20 Se atoms is observed. The intracluster correlations and the cluster-framework correlations which give rise to diffuse scattering were modeled by using PDF analysis.
authors.affiliation: Department of Physics, University of Houston, Houston, Texas 77204, USA. aabeykoon@uh.edu
authors.forename: A M Milinda
authors.initials: AM
authors.lastname: Abeykoon
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Donner
authors.forename: Michela
authors.initials: M
authors.lastname: Brunelli
authors.forename: Miguel
authors.initials: M
authors.lastname: Castro-Colin
authors.forename: Allan J
authors.initials: AJ
authors.lastname: Jacobson
authors.forename: Simon C
authors.initials: SC
authors.lastname: Moss