Microstructure and enhanced seebeck coefficient of textured Sr3Ti2O7 ceramics prepared by RTGG method |
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| Affiliation: | 1. Condensed Matter Science and Technology Institute & School of Science, Harbin Institute of Technology, Harbin 150080, China;2. State Key Laboratory of New Ceramic and Fine Processing & School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;3. National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China;4. Department of Mathematics & Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA;1. Beijing Key Lab of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, 100024, China;2. College of Physics, Chongqing University, Chongqing, 401331, China;1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese, Academy of Sciences, 230031 Hefei, PR China;2. Department of Physics, Yulin Normal University, 537000 Yulin, PR China;1. Nanophotonics Laboratory, School of Physics, Bharathidasan University, Tiruchirappalli, India;2. Advanced Centre of Research in High Energy Materials (ACRHEM), University of Hyderabad, Hyderabad, 500046, Telangana, India;1. Unité de recherche Matériaux Avancés et Nanotechnologies, Institut Supérieur des Sciences Appliquées et de Technologie de Kasserine, Université de Kairouan, BP 471, 1200 Kasserine, Tunisia;2. Laboratoire de Physique des Matériaux et des Nanomatériaux appliquée à l′Environnement, Faculté des Sciences de Gabes cite Erriadh, Université de Gabes, 6079 Gabes, Tunisia |
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| Abstract: | Textured Sr3Ti2O7 ceramics (abbreviated as S3T) with grain orientation degree higher than 0.7 were successfully prepared by reactive-templated grain growth (RTGG) technique combined with tape casting process, using plate-like Sr3Ti2O7 particles as templates. The phase transition, microstructure and thermoelectric properties were investigated. As the sintering temperature and soaking time increase, the density and texture fraction of ceramics increase. Textured Sr3Ti2O7 ceramics were sintered in air and annealed in argon + graphene carbon (Ar+C) atmosphere. The results showed that the resistivity of textured Sr3Ti2O7 ceramics annealed in Ar+C environment decreased significantly (seven orders of magnitude). After the annealing process, the texture fraction decreased, and Sr3Ti2O7 phase on the surface of textured ceramics decomposed to SrTiO3. The Seebeck coefficient was negative, and the absolute value of S increased with increasing temperature. Textured Sr3Ti2O7 ceramics showed the maximum Seebeck coefficient (?399 μV/K) at 1073 K, which is higher than those of non-textured Sr3Ti2O7-based materials. |
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| Keywords: | Orientation degree Phase transition Seebeck coefficient |
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