Ionic conductivity of gadolinium-doped barium praseodymium oxide |
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| Affiliation: | 1. Laboratory of Condensed Matter and Nanosciences, Department of Physics, Faculty of Sciences of Monastir, Monastir 5019, Tunisia;2. Laboratory of Applied Physics, Department of Physics, Faculty of Science of Sfax, 3018, Tunisia;3. Laboratory of Physics of Materials and Nanomaterials applied to the Environment, Faculty of Sciences of Gabes, University of Gabes, city Erriadh 6079, Gabes, Tunisia;4. Laboratory of Materials Science and Engineering, Faculty of Mechanical Engineering and Process Engineering, University of Science and Technology Houari Boumediene BP32 El Alia, Bab Ezzouar 16111, Algiers, Algeria;5. Neel Institute, CNRS-University of J. Fourier, B.P. 166, 38042 Grenoble, France;6. Department of Physics, College of Science Al-Zulfi, Majmaah University, Saudi Arabia;1. Institute of Problems of Chemical Physics RAS, Acad. Semenov av. 1, Chernogolovka 142432, Russia;2. Department of Chemistry, Moscow State University, Leninskie Gory, Moscow 119991, Russia |
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| Abstract: | To clarify the ionic conduction of Ba(Pr0.6Gd0.4)O3−α, the electrical conductivity was measured in moist air and hydrogen atmospheres. The ionic transport number was estimated by a steam concentration cell, a hydrogen permeation cell, and a fuel cell. Temperature dependence of the conductivity in a moist air atmosphere differed from that in a moist H2 atmosphere. The conductivity under reducing conditions increases with time according to the crystal structure change of Ba(Pr0.6Gd0.4)O3−α due to oxygen loss in the lattice site. Under moist air conditions, the dominant conduction species in the Ba(Pr0.6Gd0.4)O3−α electrolyte were mainly holes. However, the species changed into proton, oxide ion and hole by means of structure change in a reducing atmosphere. It was considered that the ionic conduction occurred due to the crystal structure change. It was predicted that this peculiarity of the conductivity of barium praseodymium oxide influenced the nonstoichiometric behaviour of Pr in the crystal structure. |
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