High-conducting Bi4V2−xFexO11-δ ceramics containing Fe2O3 nanocrystals: Structure and properties |
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| Affiliation: | 1. WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, 2–1-1 Katahira, Aoba-ku, Sendai 980–8577, Japan;2. National Institute for Materials Science, 1–2-1 Sengen, Tsukuba, Ibaraki 305–0047, Japan;3. Department of Materials Science and Engineering, Tohoku University, 6–6-02 Aramaki Aza Aoba, Sendai 980–8579, Japan;1. DISAT, Politecnico di Torino, Torino, Italy;2. Fraunhofer Institute for Ceramic Technologies and Systems IKTS, Dresden, Germany;3. Department of Ceramic Materials Engineering, University of Bayreuth, Bayreuth, Germany;1. Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China;2. College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310014, China;3. State Power Investment Corporation Hydrogen Energy Company, Limited, Beijing 102209, China;4. Faculty of Energy and Fuels, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Krakow, Poland;1. Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory, Chaozhou 521031, China;2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;3. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;4. School of Science, Wuhan University of Technology, Wuhan 430070, China |
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| Abstract: | The topography, structure, thermal, magnetic, and electrical properties of Bi4V2?xFexO11-δ ceramics substituted with x = 0.5 and 0.7 Fe were studied. The microscope analysis showed the presence of iron-rich nanocrystals formed on the Bi-Fe-V-O grains. The X-ray diffraction studies confirmed that grains are built mostly of tetragonal Bi4V1.5Fe0.5O10.5 phase. Thermal properties analysis showed an order-disorder type γ ? γ? phase transition at a temperature of around 916 K, pronounced in samples doped with x = 0.5 Fe. The magnetic anomaly was observed in ceramics doped with x = 0.7 Fe which was assigned to Morin transition of Fe2O3. The conductivity was measured over a wide frequency range from 10 mHz to 1 MHz and at a wide temperature range from 373 to 923 K, using impedance spectroscopy. The D.C. conduction process was due to oxygen vacancies hopping while at low temperatures electron holes hopping is also possible. |
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