Grain size effect on piezoelectric and ferroelectric properties of BaTiO3 ceramics |
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| Affiliation: | 1. School of Materials, Sun Yat-sen University, Guangzhou, 510275, PR China;2. Key Laboratory of Advanced Ceramics and Machining Technology Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, PR China;3. Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Wollongong, New South Wales, Australia |
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| Abstract: | A series of dense barium titanate (BaTiO3, BTO) ceramics with different grain sizes (GS) were prepared by two-step sintering method. The effect of GS on piezoelectric coefficient (d33) and planar electromechanical coupling factor (kp) displayed a trend similar to that on relative permittivity (ɛ′). The values of d33, kp, and ɛ′ increased significantly with decreasing GS, reaching maximum values (ɛ′ = 6079, d33 = 519 pC/N and kp = 39.5%) at approximately 1 μm, and then decreased rapidly with further decreasing GS. The results revealed that high-performance BTO ceramics could be effectively prepared by controlling GS. Polarization–electric field hysteresis loops and temperature dependence of ɛ′ were also investigated. |
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| Keywords: | Barium titanate Grain size Piezoelectric and ferroelectric properties |
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