Structural,magnetic, electrical and electrochemical properties of SrCoO2.5, Sr9Co2Mn5O21 and SrMnO3 compounds |
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| Affiliation: | 1. Inonu University, Physics Department, Malatya, Turkey;2. Anadolu University, Physics Department, Eskisehir, Turkey;3. Inonu University, IBTAM, Malatya, Turkey;4. Istanbul Medeniyet University, Dept. of Engineering Physics, Istanbul, Turkey;1. Inonu University, Science and Art Faculty, Physics Department, 44280 Malatya, Turkey;2. Inonu University, Scientific and Technological Research Center, 44280 Malatya, Turkey;1. Department of Physics, Inonu University, Faculty of Arts and Sciences, 44280 Malatya, Turkey;2. Department of Materials Science and Engineering, Afyon Kocatepe University, 03200 Afyon, Turkey;3. Scientific and Technological Research Center, Inonu University, 44280 Malatya, Turkey;1. Institute of Physics, Pedagogical University, Podchorazych 2, PL-30-084 Cracow, Poland;2. Institute of Physics, Jagiellonian University, Prof. Stanislawa Lojasiewicza 11, PL-30-348 Cracow, Poland;3. Niewodniczanski Institute of Nuclear Physics PAN, ul. Radzikowskiego 152, PL-31-342 Cracow, Poland;4. Lviv Polytechnic National University, 12 Bandera St., 79013 Lviv, Ukraine;5. Institute of Molecular Physics, Polish Academy of Science, Smoluchowskiego 17, PL-60-179 Poznan, Poland;6. Department of Chemistry, Jagiellonian University, Ingardena 3, PL-30-060 Cracow, Poland;7. Institute of Solid State Physics, University of Latvia, 8 Kengaraga Str., LV-1063 Riga, Latvia;8. Institute of Physics PAS, Al. Lotnikow 32/46, PL-02-668 Warsaw, Poland |
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| Abstract: | SrCo1−xMnxO3−d (0 ≤ x ≤ 1) were synthesized by conventional solid state reaction method. We found that Mn substitution hinders the decomposition of carbonate at 900 °C and increases the synthesis temperature of SrCo1−xMnxO3−d to 1200 °C. Three different main phases emerge as the Mn content is increased; SrCoO2.5, Sr9Co2Mn5O21 and SrMnO3. Structural properties of the samples were investigated by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, x-ray diffraction (XRD) and scanning electron microscopy (SEM). Valance states of the transition metal (TM) ions were estimated based on lattice parameters and ionic radii of TM ions. High temperature resistivity measurements show hysteresis upon heating and cooling and is attributed to oxygen release without any endothermic/exothermic activity. The spin configurations of Co and Mn ions in SrCoO2.5, Sr9Co2Mn5O21 and SrMnO3 were estimated by Curie-Weiss fitting of χ-T curves. Electrochemical measurements show two anodic/cathodic peaks indicating two main types of oxygen sites in the unit cell. |
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| Keywords: | Cycling voltammogram Spin state |
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