Abstract
Perovskite-type (ABO3) SrFe1−xMnxO3−δ specimens (0.1 ≤ x ≤ 0.6) were prepared via the Pechini method. The Mn and Fe valences were determined by means of X-ray absorption fine structure spectroscopy and iodometry, and the average B valences and oxygen contents (3−δ) were calculated from the obtained valences. In perovskite SrFe1−xMnxO3−δ specimens, it was found that oxide ion vacancies existed on several octahedra. Thermogravimetry showed that the degree of oxygen desorption increased upon increasing the temperature but decreased at higher Mn contents, thereby indicating that Mn ions were not reduced in the obtained cubic perovskite phase. It was therefore considered that Fe ions were more easily reduced, and that the crystal structure was stable during oxygen desorption, thereby suppressing the reduction of Mn ions in the B-site mixed perovskite-type SrFe1−xMnxO3−δ.
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