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Preparation and characterization of stoichiometric CaFeO3 |
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| Authors: | Y. Takeda S. Naka M. Takano T. Shinjo T. Takada M. Shimada |
| Affiliation: | Synthetic Crystal Research Laboratory, Faculty of Engineering, Nagoya University, Nagoya, Japan;Department of Chemistry, Faculty of Science, Konan University, Kobe, Japan;Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu, Japan;The Institute of Scientific and Industrial Research, Osaka University, Osaka, Japan |
| Abstract: | Stoichiometric CaFeO3 was prepared and was characterized by crystallographic, magnetic and electrical measurements. A slight tetragonal distortion from the ideal cubic perovskite structure was found. The tetramolecular unit cell has a = 5.325 (3) A and c = 7.579 (5) A. The susceptibility showed a maximum at about 115 K and the temperature dependence of electrical resistivity changed from metallic to semiconductive in the vicinity of the magnetic transition temperature. These indicate a phase transition from the metallic-paramagnetic (the high-temperature phase) to the semiconductive-antiferromagnetic phase. The Mössbauer spectra indicated that a charge disproportionation 2Fe4+ → Fe3+ + Fe5+ associates with the transition. |
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