Microstructure and piezoelectric properties of thermal sprayed Bi0.5(Na0.70K0.20Li0.10)0.5TiO3 ceramic coatings |
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| Authors: | Kun Guo Meysam Sharifzadeh Mirshekarloo Ming Lin Kui Yao Shuting Chen Francis Eng Hock Tay |
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| Affiliation: | 1. Institute of Materials Research and Engineering, A?STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis 138634, Singapore;2. Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, 117575, Singapore |
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| Abstract: | The microstructure of Bi0.5(Na0.70K0.20Li0.10)0.5TiO3 (BNKLT) coatings fabricated by thermal spray method was closely examined by TEM, revealing the coexistence of rhombohedral and tetragonal perovskite main phases, and very minor secondary phases, while all amorphous phase was crystallized after heat treatment. Obtaining coexisting rhombohedral and tetragonal perovskite phases after the thermal spray process involving the melting-recrystallization and heat treatment process resulted in piezoelectric ceramic coating with excellent electrical and electromechanical properties. The effective piezoelectric coefficient d33 of the heat-treated BNKLT coating reached 86?pm/V with substrate clamping, measured over macroscale by laser scanning vibrometer. |
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| Keywords: | Piezoelectric properties Lead-free ceramics Microstructure Thermal spray |
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