The thermal decomposition of K0.5Bi0.5TiO3 ceramics |
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| Authors: | J. König M. Spreitzer B. Jančar D. Suvorov Z. Samardžija A. Popovič |
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| Affiliation: | 1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei, China;2. Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA;1. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200 Thailand;2. Science and Technology Research Institute, Chiang Mai University, Chiang Mai, 50200 Thailand;3. Department of Industrial Engineering, Faculty of Engineering, Rajamangala University of Technology Lanna (RMUTL), Chiang Mai, 50300 Thailand;4. School of Physics, Institute of Science, and NANOTEC-SUT Centre of Excellence on Advanced Functional Nanomaterials, Suranaree University of Technology, NakhonRatchasima, 30000 Thailand;5. Materials Science, School of Mechanical, Industrial and Manufacturing Engineering, Oregon State University, Corvallis, OR, 97331 USA;1. School of Ceramics Engineering, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand;2. Department of Applied Physics, Faculty of Sciences and Liberal Arts, Rajamangala University of Technology Isan, Nakhon Ratchasima 30000, Thailand;3. Division of Physics, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathumthani 12110, Thailand;4. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50202, Thailand;1. Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China;2. Laboratory of Dielectric Functional Materials, School of Physics and Material Science, Anhui University, Hefei 230601, China;3. School of Materials Science & Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, China |
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| Abstract: | The high-temperature behaviour of K0.5Bi0.5TiO3, prepared using a conventional solid-state reaction method, was investigated using X-ray powder diffraction, scanning electron microscopy, wavelength-dispersive X-ray spectroscopy and Knudsen effusion combined with mass spectrometry. The results revealed the formation of an off-stoichiometric matrix phase with an excess of bismuth and a deficit of potassium compared to the stoichiometric K0.5Bi0.5TiO3 during the solid-state reaction. During the thermal treatment potassium and bismuth vapours were detected over the solid sample and related to the thermal decomposition of the matrix phase. The losses of the potassium and bismuth components shifted the nominal composition to a three-phase region, and as a result, K2Ti6O13 and a new Bi-rich ternary phase were formed in the system, the latter being formed after prolonged sintering. Differential thermal analyses and heating-microscope analyses showed a narrow sintering-temperature range limited by the melting of the sample above 1040 °C. |
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