title: From Tetrahedral to Octahedral Iron Coordination: Layer Compression in Topochemically Prepared FeLa2Ti3O10.
abstract: Synthesis, characterization, and thermal modification of the new layered perovskite FeLa2Ti3O10have been studied. FeLa2Ti3O10was prepared by ion exchange of the triple-layered Ruddlesden-Popper phase Li2La2Ti3O10with FeCl2at 350 °C under static vacuum. Rietveld refinement on synchrotron X-ray diffraction data indicates that the new phase is isostructural with CoLa2Ti3O10, where FeIIcations occupy slightly compressed/flattened interlayer tetrahedral sites. Magnetic measurements on FeLa2Ti3O10display Curie-Weiss behavior at high temperatures and a spin-glass transition at lower temperatures (<30 K). Thermal treatment in oxygen shows that FeLa2Ti3O10undergoes a significant cell contraction (Δc ≈ -2.7 Å) with a change in the oxidation state of iron (Fe2+to Fe3+); structural analysis and Mössbauer studies indicate that upon oxidation the local iron environment goes from tetrahedral to octahedral coordination with some deintercalation of iron as Fe2O3to produce Fe0.67La2Ti3O10.
authors: Department of Chemistry and Advanced Materials Research Institute, University of New Orleans , New Orleans, Louisiana 70148, United States.
authors: Léa
authors: L
authors: Gustin
authors: Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan.
authors: Yoshiteru
authors: Y
authors: Hosaka
authors: Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan.
authors: Cédric
authors: C
authors: Tassel
authors: Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan.
authors: Tomoko
authors: T
authors: Aharen
authors: Institute for Chemical Research, Kyoto University , Uji, Kyoto 611-0011, Japan.
authors: Yuichi
authors: Y
authors: Shimakawa
authors: Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan.
authors: Hiroshi
authors: H
authors: Kageyama
authors: Department of Chemistry and Advanced Materials Research Institute, University of New Orleans , New Orleans, Louisiana 70148, United States.
authors: John B
authors: JB
authors: Wiley