Oxygen non-stoichiometry and electrical conductivity of Pr2?xSrxNiO4±δ with x = 0–0.5 |
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| Institution: | 1. Institute of Physical Chemistry and Electrochemistry, Dresden University of Technology, Bergstrasse 66b, D-01062 Dresden, Germany;2. Kurt-Schwabe-Institute of Measurements and Sensor Technology, Meinsberg, Kurt-Schwabe-Strasse 4, D-04720 Ziegra-Knobelsdorf, Germany;3. Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Rd., Shanghai, 200050, China;1. Laboratory of Electrochemical Devices Based on Solid Oxide Proton Electrolytes, Institute of High Temperature Electrochemistry, Yekaterinburg 620990, Russia;2. Ural Federal University, Yekaterinburg 620002, Russia;3. Department of Mechanical Engineering, School of Engineering, University of Thessaly, Pedion Areos, Volos 383 34, Greece;2. Institute of Power Engineering, Mory 8, Warsaw, 01-330, Poland;3. AGH University of Science and Technology, Faculty of Energy and Fuels, al. A. Mickiewicza 30, 30-059, Krakow, Poland;4. Max Planck Institute for Solid State Research, Stuttgart, Germany;1. Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, 1, Section 3, Zhongxiao E. Road, Taipei 106, Taiwan;2. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China;1. Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, China;2. Engineering Research Center of Nano-Geo Materials of Ministry of Education, China University of Geosciences, Wuhan 430074, China |
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| Abstract: | Oxygen non-stoichiometry and electrical conductivity of the Pr2?xSrxNiO4±δ series with x = 0.0–0.5 were investigated in Ar/O2 (pO2 = 2.5 to 21 000 Pa) within a temperature range of 20–1000 °C. The equilibrium values of oxygen non-stoichiometry and electrical conductivity of these nickelates were determined as functions of temperature and oxygen partial pressure (pO2). The nickelates with x = 0–0.5 appear to be p-type semiconductors in the investigated temperature and pO2 ranges. The nickelates with x = 0.3–0.5 show very feebly marked pO2 dependencies of the conductivity. Pr1.7Sr0.3NiO4±δ shows the anomalies of the conductivity versus oxygen partial pressure which can be related to the orthorhombic–tetragonal crystal structure transformations. The conductivity of the Pr2?xSrxNiO4±δ samples correlates with the average oxidation state of the nickel cations. The samples with x = 0.5 have the highest nickel oxidation state (≈ 2.5+), the highest Ni3+]/Ni2+] ratio close to 1 and show the highest conductivity (≈ 120 S/cm) in the whole pO2 and temperature ranges investigated. |
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