title: Stability of the infinite layer structure with iron square planar coordination.
abstract: The recently discovered SrFeO2 prepared by a soft chemical route from a precursor SrFeO3 has the "infinite layer" (IL) structure with an unprecedented FeO4 square-planar coordination. We show that the IL structure has significant solubility to yield Sr1-xCaxFeO2 (0 <or= x <or= 1) and is thermally stable (at least as high as 1000 K for SrFeO2). These results demonstrate that the IL structure, once it is formed at low temperatures, is surprisingly robust owing to the extremely covalent nature of the Fe-O bond, thereby opening a door to chemical tuning of properties and to possible high-temperature applications.
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan.
authors.forename: Cédric
authors.initials: C
authors.lastname: Tassel
authors.forename: Takashi
authors.initials: T
authors.lastname: Watanabe
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Tsujimoto
authors.forename: Naoaki
authors.initials: N
authors.lastname: Hayashi
authors.forename: Atsushi
authors.initials: A
authors.lastname: Kitada
authors.forename: Yuji
authors.initials: Y
authors.lastname: Sumida
authors.forename: Takafumi
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kageyama
authors.forename: Mikio
authors.initials: M
authors.lastname: Takano
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Yoshimura
mesh_terms: D002118:Calcium / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008958:Models, Molecular; D010100:Oxygen / Q000737:chemistry*; D013324:Strontium / Q000737:chemistry*; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D007501:Iron; D010100:Oxygen; D002118:Calcium; D013324:Strontium