Oxygen nonstoichiometry,mixed valency and mixed conduction in (La,Sr)(Co,Fe)O3−δ |
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| Affiliation: | 1. Department of Materials Science and Chemistry, Graduate School of Engineering, University of Hyogo, Himeji, Hyogo 671-2280, Japan;2. Department of Interdisciplinary Environment, Graduate School of Human and Environmental Studies, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan;1. Department of Bioengineering, The University of Tokyo, 1-3-7 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;2. Department of Electrical Engineering and Information Systems, The University of Tokyo, 1-3-7 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;3. Department of Biomaterial Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan;1. Department of Chemistry, Kalasalingam University, Krishnankoil, 626126, India;2. Department of Chemistry, Thiagarajar College of Engineering, Madurai 625015,India;3. Graduate School of Electronic Science and Technology, Research Institute of Electronics, Shizuoka University, Hamamatsu 432-8011, Japan;1. Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an, 710119, PR China;2. School of Science, Lanzhou University of Technology, Lanzhou, 730050, PR China;1. Ural Federal University named after the first President of Russia B.N. Yeltsin, Ekaterinburg 620002, Russia;2. Institute of Electrophysics UrB RAS, Ekaterinburg 620016, Russia;3. ISTEC-CNR, Institute of Science and Technology for Ceramics, Faenza 48018, Italy;1. Center for Nanomaterials Research, Rutgers University, Piscataway, NJ 08854, USA;2. Department of Materials Science and Engineering, Rutgers University, Piscataway, NJ 08854, USA;3. Department of Mechanical and Aerospace Engineering, Rutgers University, Piscataway, NJ 08854, USA;4. Diamond Materials Inc., Piscataway, NJ 08854, USA;5. Raytheon IDS, Andover, MA 01810, USA;1. Department of Bioengineering, The University of Tokyo, 1-3-7 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;2. Institute of Engineering Innovations, The University of Tokyo, 1-3-7 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;3. Institute of Innovation in International Engineering Education, The University of Tokyo, 1-3-7 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;4. Department of Electrical Engineering and Information Systems, The University of Tokyo, 1-3-7 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan |
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| Abstract: | Defect chemistry for a mixed conductor, La0.6Sr0.4Co0.2Fe0.8O3−δ was studied. Samples were treated under controlled oxygen partial pressure, P(O2), conditions at 1273 K [10− 11.1 ≤ P(O2)/atm ≤ 1], and cooled to room temperature. Oxygen nonstoichiometry and valences of transition metal ions for the treated samples were evaluated by iodometry and X-ray absorption spectroscopy, respectively. With decreasing P(O2), preferential reduction of Co3+ to Co2+ was observed, while iron preserved its higher valence above 3 under conditions studied. A dependency of its electrical conductivity on P(O2) was discussed along with a change in concentration of oxygen vacancies and mixed valences. |
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