Low-temperature hydro/solvothermal synthesis of Ta-modified K0.5Na0.5NbO3 powders and piezoelectric properties of corresponding ceramics |
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| Affiliation: | 1. Faculty of Materials, Optoelectronics and Physics, Xiangtan University, Xiangtan, Hunan 411105, PR China;2. Key Laboratory of Low Dimensional Materials and Application Technology of the Ministry of Education, Xiangtan University, Xiangtan, Hunan 411105, PR China;1. Department of Chemistry, The IIS University, Jaipur 302020, India;2. Department of Chemistry, University of Hyderabad, Hyderabad 500046, India;3. Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Postfach 3329, D-38023 Braunschweig, Germany;1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;2. Guangdong Fenghua Advanced Technology Company Limited, Guangdong 526020, China;1. Department of Chemistry, TKL of Metal- and Molecule-Based Material Chemistry and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin 300071, PR China;2. School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, PR China;1. School of Advanced Sciences, Vellore Institute of Technology University, Vellore, India;2. Chemical Laboratory, CSIR-Central Leather Research Institute, Adyar, Chennai 600 020, India |
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| Abstract: | K0.5Na0.5Nb1–xTaxO3 (KNNTx, x = 0–0.4) powders were synthesized by a novel hydro/solvothermal method at a low reaction temperature (180 °C) and the corresponding ceramics were obtained by normal sintering. Compared with conventional solid-state reaction technique, the optimal sintering temperatures of these ceramics were reduced at least 150 °C. Crystalline structures and surface morphologies were analyzed by X-ray diffraction and scanning electron microscopy. The excellent piezoelectric properties could be obtained by selecting poling temperature near the orthorhombic–tetragonal polymorphic phase transition temperature region. Ta-modified KNN ceramics exhibited better piezoelectric properties than those of pure KNN, and the piezoelectric coefficient d33 showed the maximum value of 156 pC/N for KNNT0.3 ceramics. In addition, the sintering temperature for maximum d33 value differed from that for maximum density. The present hydro/solvothermal method provides a new potential route for preparing KNN-based materials at relatively low temperature. |
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