Piezoelectric and ferroelectric properties of lead-free [Bi1?y(Na1?x?yLix)]0.5BayTiO3 ceramics |
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| Affiliation: | 1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China;2. Xi’an Hongxing Electronic Paste Co. Ltd., Xi’an 710065, China;1. Acharya Prafulla Chandra Roy Govt. College, Siliguri-734010, India;2. Department of Physics, University of North Bengal, Siliguri-734013, India;3. Institute of Chemistry, Military University of Technology, Warsaw–00208, Poland;1. Advanced Magnetics Group, Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad 500058, India;2. Advanced Functional Materials Laboratory, Department of Physics, Indian Institute of Technology, Hyderabad, 502205, India;1. Electroceramics Research Group, Department of Physics, Birla Institute of Technology, Mesra, Ranchi, India;2. School of Advanced Materials Engineering, Changwon National University, Gyeong-Nam, 641-773, Republic of Korea;1. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, PR China;2. Guangxi Experiment Center of Information Science, Guilin 541004, PR China |
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| Abstract: | Lead-free Bi1?y(Na1?x?yLix)]0.5BayTiO3 (BNLB-x/y) piezoelectric ceramics were prepared by sintering the constituent oxides, and their piezoelectric and ferroelectric properties studied. The results of X-ray diffraction (XRD) suggest that Li+ and Ba2+ diffuse into the Bi0.5Na0.5TiO3 (BNT) lattices to form a solid solution with a single-phase perovskite structure. The ceramics can be well sintered at 1100–1150 °C. The introduction of Li+ and Ba2+ into Bi0.5Na0.5TiO3 significantly decreases the coercive field, Ec but maintains the large remanent polarization, Pr of the materials. The ceramics exhibit relatively good piezoelectric properties and very strong ferroelectricity: piezoelectric constant, d33 = 208 pC/N, planar electromechanical coupling factor, kp = 37.0%, remanent polarization, Pr = 38.5 μC/cm2, coercive field, Ec = 3.27 kV/mm. The depolarization temperature, Td of BNLB-0.075/0.04 ceramics is about 190 °C. |
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