Effects of BiMO3 on dielectric,ferroelectric, and piezoelectric properties of perovskite lead‐free piezoelectric BaTiO3–(Bi0.5Na0.5)TiO3 ceramics |
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| Authors: | Nopsiri Chaiyo Rangson Muanghlua Wanwilai Vittayakorn Naratip Vittayakorn |
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| Affiliation: | 1. Electroceramic Research Laboratory, College of Nanotechnology, King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand;2. Nano‐KMITL Center of Excellence on Nanoelectronic Devices, King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand;3. Department of Electronics Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand;4. Advanced Material Research Unit, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand;5. Department of Chemistry, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand |
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| Abstract: | New lead‐free piezoelectric ceramics of 0.9BaTiO3–(0.1?x)(Bi0.5Na0.5)TiO3–xBiMO3, M=Al and Ga, where x=0.00‐0.10, were fabricated by the solid‐state reaction technique. The effect of BiMO3 contents on the perovskite structure, phase transition, and dielectric, ferroelectric, and piezoelectric properties was investigated. X‐ray diffraction patterns showed that the ceramics exhibit a monophasic perovskite phase up to x=0.06, suggesting stabilized perovskite structures with B‐site aliovalent substitutions. Compositional‐dependent phase transitions were observed from tetragonal to pseudo‐cubic phase with increasing BiMO3 amounts. Al3+ ions were found to stabilize the transition temperature of the ceramics, while significantly decreasing transition temperature, and a change in the dielectric peak were found with an increasing amount of Ga3+. Regarding Al3+ substitution, the remanent polarization (Pr) values were found to decrease slightly with the Al3+ amount. With regard to Ga3+ substitution, Pr values decreased with the Ga3+ amount up to 0.06 and then increased slightly. The ceramics became softer with a higher degree of substitution according to the lower coercive field (Ec), when compared with 0.9BaTiO3–0.1(Bi0.5Na0.5)TiO3 ceramics. Ceramics with a lower degree of substitution and tetragonal phase showed butterfly strain loops that correlated with normal ferroelectric behavior. |
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| Keywords: | barium titanate bismuth sodium titanate lead‐free piezoelectric ceramic |
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