Microstructures and electrical conductivity of nanocrystalline ceria-based thin films |
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| Institution: | 1. Department of Materials Science and Engineering, Feng Chia University, Taichung 407, Taiwan;2. Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan;1. Department of Physics, Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore 641020, Tamil Nadu, India;2. Department of Physics, Athiyaman College of Engineering, Hosur, Tamil Nadu, India;1. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, 119991, 31 Leninsky Pr., Moscow, Russia;2. Faculty of Physics, Lomonosov Moscow State University, 119991, 1-2 Leninskie Gory, Moscow, Russia;3. Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991, 1-2 Leninskie Gory, Moscow, Russia;1. Materials Science and Engineering Postgraduate Program – PPGCEM, UFRN, 59072-970 Natal, Brazil;2. CICECO, Deptartment of Materials & Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal;1. Faculty of Engineering, Kyushu University, Motooka, 744, Nishi-ku, Fukuoka 819-0395, Japan;2. Center of Coevolutionary Research for Sustainable Communities, Kyushu University, Motooka, 744, Nishi-ku, Fukuoka 819-0395, Japan;3. Platform of Inter / Transdisciplinary Energy Research (Q-PIT), Kyushu University, Motooka, 744, Nishi-ku, Fukuoka 819-0395, Japan;4. Next-Generation Fuel Cell Research Center (NEXT-FC), Kyushu University, Motooka, 744, Nishi-ku, Fukuoka 819-0395, Japan;5. International Research Center for Hydrogen Energy, Kyushu University, Motooka, 744, Nishi-ku, Fukuoka 819-0395, Japan;6. International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Motooka, 744, Nishi-ku, Fukuoka 819-0395, Japan |
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| Abstract: | Ceria-based thin films are potential materials for use as gas-sensing layers and electrolytes in micro-solid oxide fuel cells. Since the average grain sizes of these films are on the nanocrystalline scale (< 150 nm), it is of fundamental interest whether the electrical conductivity might differ from microcrystalline ceria-based ceramics. In this study, CeO2 and Ce0.8Gd0.2O1.9−x thin films have been fabrication by spray pyrolysis and pulsed laser deposition, and the influence of the ambient average grain size on the total DC conductivity is investigated. Dense and crack-free CeO2 and Ce0.8Gd0.2O1.9−x thin films were produced that withstand annealing up to temperatures of 1100 °C. The dopant concentration and annealing temperature affect highly the grain growth kinetics of ceria-based thin films. Large concentrations of dopant exert Zener drag on grain growth and result in retarded grain growth. An increased total DC conductivity and decreased activation energy was observed when the average grain size of a CeO2 or Ce0.8Gd0.2O1.9−x thin film was decreased. |
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