Continuous BaTi1 ? yZryO3 (0 ≤ y ≤ 1) nanocrystals synthesis in supercritical fluids for nanostructured lead-free ferroelectric ceramics |
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| Affiliation: | 1. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea;2. School of Chemical & Biological Engineering & Research Center for Energy Conversion and Storage, Seoul National University, Seoul 151-744, Republic of Korea;3. Agency for Defense Development, Daejeon 305-600, Republic of Korea;4. Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea;5. KAIST Institute for the NanoCentury, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea;1. Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, Szeged H-6720, Hungary;2. Laboratory of High Performance Ceramics, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf CH-8600, Switzerland;3. Laboratory of Physics of Complex Matter, École Polytechnique Fédérale de Lausanne, Ecublens CH-1026, Switzerland;1. Université de Lorraine, Laboratoire de Chimie Physique et Microbiologie pour l''Environnement (LCPME), UMR 7564, 405 rue de Vand?uvre, F-54600 Villers-lès-Nancy, France;2. CNRS, Laboratoire de Chimie Physique et Microbiologie pour l''Environnement (LCPME), UMR 7564, 405 rue de Vand?uvre, F-54600 Villers-lès-Nancy, France;3. Ecole Nationale Supérieure de Chimie de Rennes, UMR CNRS 6226, 11 Allée de Beaulieu, CS 50837, F-35708 Rennes cedex 7, France;4. Université Européenne de Bretagne, 4 Boulevard Laennec, F-35700 Rennes, France |
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| Abstract: | This paper addresses for the first time two of the main challenges in the field of electroceramics. The first one is the development of a continuous, fast and reliable synthesis method for producing sub-20 nm barium titanate zirconate (BaTi1-yZryO3 with 0 ≤ y ≤ 1–BTZ) nanocrystals over the whole solid solution, while keeping a narrow size distribution. The second one concerns the processing of dense and nanostructured lead free electroceramics highlighting the size effect on the crossover from ferroelectric to relaxor, in the case of grains smaller than 100 nm. This was achieved combining the supercritical fluid technology to produce in continuous and at moderate temperature (400 °C) BTZ nanocrystals, with Spark Plasma Sintering (SPS) to prevent grain growth during the sintering. |
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