title: XAFS study of copper species stabilized in the interlayer space of layered perovskite oxides.
abstract: New intercalation compounds with Cu2+ ions in the interlayer of layered perovskite oxides, OA(1-x)Ca(2-x)La(x)Nb3O10) (OA = n-octylammonium ion, 0 < or = x < 1), have been prepared by ion-exchange reaction, and characterized by means of XRD and XAS. For the detail elucidation of the fine structure of the Cu K-edge XANES spectra, polarized XAS was applied for the [Cu(en)2]2+ and Cu2+ ions intercalated to the single crystal. According to the XANES and EXAFS spectra measured at Cu K-edge, copper ions are four coordinated. In addition, XANES spectra have shown that the charge transfer from host layer to intercalated ions influences on the chemical state of copper ion.
authors.affiliation: Department of Chemistry, Kyungpook National University, Taegu, Korea. kimdk@knu.ac.kr
authors.forename: D K
authors.initials: DK
authors.lastname: Kim
authors.forename: S H
authors.initials: SH
authors.lastname: Choi
authors.forename: Y S
authors.initials: YS
authors.lastname: Han
authors.forename: H
authors.initials: H
authors.lastname: Yun