Investigation of the electrical conductivity of sintered monoclinic zirconia (ZrO2) |
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| Affiliation: | 1. KEPCO Nuclear Fuel, Co., Ltd., Daejeon 34057, Republic of Korea;2. Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea;3. UNIST Central Research Facilities (UCRF), Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea;4. Chungbuk National University, Chungbuk 28644, Republic of Korea;1. Université Grenoble-Alpes, CNRS, LMGP, F-38000 Grenoble, France;2. IMCN/NAPS, Université Catholique de Louvain, 2 Chemin du Cyclotron, 1348 Louvain-la-Neuve, Belgium;3. Université Grenoble-Alpes, CNRS, SIMAP, F-38000 Grenoble, France;1. School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA;2. Department of Mechanical Engineering, Colorado State University, Fort Collins, CO 80523, USA;3. Department of Chemical Engineering & Materials Science, University of California, Davis, CA 95616, USA;4. School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA;1. Ceramic Physics Laboratory, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, 606-8585 Kyoto, Japan;2. Department of Materials Science and Engineering, Shanghai University, Shanghai, PR China;3. Department of Orthopaedic Surgery, Tokyo Medical University, 6-7-1, Nishi-Shinjuku, Shinjuku-ku, 160-0023 Tokyo, Japan;4. The Center for Advanced Medical Engineering and Informatics, Osaka University, Yamadaoka, Suita, 565-0871 Osaka, Japan;5. Department of Immunology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kamigyo-ku, 465 Kajii-cho, Kawaramachi dori 602-0841 Kyoto, Japan;1. Gebze Technical University, Department of Material Science and Engineering, 43100, Kocaeli, Turkey;2. Gebze Technical University, Institute of Energy Technologies, 43100, Kocaeli, Turkey;1. Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany;2. Materials Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, D-95440 Bayreuth, Germany |
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| Abstract: | High-density monoclinic ZrO2 was manufactured through sintering at ~1200 °C by using nanosized powders. Then, the electrical conductivity was measured at a range of high temperatures (700–900 °C) by electrical impedance spectroscopy (EIS). For the as-sintered monoclinic ZrO2, the measured electrical conductivity was 3.2×10?5 s/cm (for 80% TD) and 4.4×10?5 s/cm (for 89% TD) at 900 °C. After aging at 900 °C for 100 h, the electrical conductivity of the monoclinic ZrO2 of 80%-TD decreased by more than 50%. However, after reheating at 1200 °C for 1 h, approximately 80% of the conductivity was recovered compared to the value of the as-sintered monoclinic ZrO2. The pure monoclinic crystal structure was retained despite the aging and reheating treatment. Based on microstructural observations of the aged and reheated monoclinic ZrO2, the changes in electrical conductivity after aging and reheating were explained by the formation and recovery of micro-cracks, respectively. |
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| Keywords: | Electrical conductivity Impedance Undoped zirconia |
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