Piezoelectric enhancements in K0.5Na0.5NbO3-based ceramics via structural evolutions |
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| Affiliation: | 1. School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia;2. Malaysia Nuclear Agency, Bangi, 43000, Kajang, Selangor, Malaysia;1. Department of Physics, Harbin Institute of Technology, Harbin 150001, China;2. School of Material Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;1. CAS Key Laboratory of Space Manufacturing Technology, Chinese Academy of Sciences, Beijing, 100190, People''s Republic of China;2. University of Chinese Academy of Sciences, Beijing, 100049, People''s Republic of China;1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi''an, 710072, PR China;2. Science and Technology on Plasma Dynamics Lab, Air Force Engineering University, Xi''an, 710038, PR China;1. Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, School of Materials Science and Engineering, Tongji University, Shanghai 201804, China;2. School of Material Science and Engineering, University of Jinan, Jinan 250022, China;3. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China;1. Department of Materials Science, Sichuan University, Chengdu, 610064, PR China;2. Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 239955, Saudi Arabia |
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| Abstract: | The current work aims to compare the effect of systematic A-site and B-site substitutions on the piezoelectricity of Ka0.5Na0.5NbO3 (KNN)-based perovskite ceramics. The A-site elements was replaced by Li+ while Nb5+ was substituted by Sb5+ to form (K0.4675Na0.4675Li0.065)NbO3 (KNLN) and (K0.4675Na0.4675Li0.065)(Nb0.96Sb0.04)O3 (KNLNS) respectively. The ceramics were prepared using solid-state sintering method. The density of the ceramics steadily improved with the substitutions while the crystal structure evolved from monoclinic (in KNN) to the coexistence of monoclinic and tetragonal (in KNLN) and finally tetragonal in KNLNS. Distinct variations on size and morphology were recorded. Although density, crystal structure and morphology have minor effect on the Ec, they imposed considerable influences on Pr, d33 and kp. Despite relatively lower density, KNLN exhibited the highest Pr, d33 and kp at 9.80 μC/cm2,185 pC/N and 0.43 respectively signifying the positive enhancement brought by the co-existence of monoclinic and tetragonal crystal structures. More importantly, this work systematically proved that the co-existence of both structures signified the morphotropic phase boundary (MPB) composition as the primary factor for the enhancement of KNN piezoelectric properties. |
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| Keywords: | Li and Sb Crystal structure MPB Electro-acoustic |
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