Synthesis and characterization of nanocrystalline ferroelectric Sr0.8Bi2.2Ta2O9 by conventional and microwave sintering: A comparative study |
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| Affiliation: | 1. Thin Film and Material Science Laboratory, Department of Applied Physics, Delhi Technological University (Formerly Delhi College of Engineering), Delhi 110042, India;2. Department of Applied Sciences, A.I.A.C.T.R. Geeta Colony, Delhi 110092, India;1. Electroceramics Group, Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz, Iran;2. Department of Materials Science and Engineering, Hakim Sabzevari University, Iran;1. National Engineering Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Jianshe Road, Chengdu, 610054, PR China;2. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Jianshe Road, Chengdu, 610054, PR China;1. School of Physics and Electronic Science, Hubei University, Key Laboratory of Ferro & Piezoelectric Materials and Devices of Hubei Province, Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Wuhan 430062, China;2. School of Materials Science and Engineering, Hubei University, Wuhan 430062, China;1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China;2. School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, PR China;1. Nanomaterials Research Lab, Department of Chemistry, Sidho-Kanho-Birsha University, Purulia, 723104, India;2. Department of Chemistry, Centre for Materials Science and Nanotechnology Chemistry (SMN), University of Oslo, Norway |
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| Abstract: | In recent years mechanical activation technique has been utilized to synthesize the nanocrystalline form of compounds resulting in enhancement in the properties. Also, microwave sintering is being preferred over conventional sintering due to rapid processing and uniform temperature distribution throughout the specimen. In the present work, nanocrystalline non-stoichiometric strontium bismuth tantalate (SBT) of the composition Sr0.8Bi2.2Ta2O9 ferroelectric ceramics were synthesized by microwave sintering process (with sintering temperatures of 1000 °C and 1100 °C) and conventional solid state reaction process (with sintering temperature of 1100 °C) with an objective of comparing the properties of the synthesized specimens by the two processes. X-ray diffraction analysis shows the formation of single phase layered perovskite structure formation by both the processes. Scanning electron microscopy reveals the formation of a finer granular microstructure in the specimen synthesized by microwave sintering compared to that in the specimen prepared by conventional sintering. The specimen prepared by microwave sintering process exhibits improved electrical properties with higher dielectric constant, higher piezoelectric and pyroelectric coefficients and lower dielectric loss. |
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