Effects of sintering temperature and poling conditions on the electrical properties of Ba0.70Ca0.30TiO3 diphasic piezoelectric ceramics |
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| Authors: | Cai-Xia Li Bin Yang Shan-Tao Zhang Rui Zhang Wen-Wu Cao |
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| Affiliation: | 1. Department of Physics, Condensed Matter Science and Technology Institute, Harbin Institute of Technology, Harbin 150001, PR China;2. Department of Material and Physics, School of Applied Sciences, Harbin University of Science and Technology, Harbin 150080, PR China;3. Department of Materials Science and Engineering & National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, PR China;4. Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA |
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| Abstract: | The effects of sintering temperature and poling conditions on the electrical properties of tetragonal and orthorhombic diphasic Ba0.70Ca0.30TiO3 (BCT) lead-free ceramics have been systematically investigated. On the one hand, with increasing sintering temperature from 1270 °C to 1400 °C, the bulk density increases monotonically and the Curie temperature keeps almost constant with the value of ∼120 °C, whereas the grain size, the maximum relative dielectric constant, room temperature polarization reach the maximum values for samples sintered at 1340 °C. On the other hand, it is found that the piezoelectric property depends on poling electric field and poling temperature significantly. An enhanced piezoelectric behavior of d33=126 pC/N, kp=0.29, and Qm=588 is obtained for the BCT ceramics poled at 100 °C with 30 kV/cm field for 20 min. The aging behavior of the piezoelectric property is also investigated. |
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| Keywords: | Ba0 70Ca0 30TiO3 Piezoelectric properties Poling conditions Sintering |
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