Stability of the infinite layer structure with iron square planar coordination.
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.
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Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan.
Watanabe
Takashi
T
Tsujimoto
Yoshihiro
Y
Hayashi
Naoaki
N
Kitada
Atsushi
A
Sumida
Yuji
Y
Yamamoto
Takafumi
T
Kageyama
Hiroshi
H
Takano
Mikio
M
Yoshimura
Kazuyoshi
K
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
D007501:Iron; D010100:Oxygen; D002118:Calcium; D013324:Strontium