Enhanced piezoelectric properties and electrical resistivity in W/Cr co-doped CaBi2Nb2O9 high-temperature piezoelectric ceramics |
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Authors: | Zhenning Chen Linsheng Sheng Xudong Li Peng Zheng Wangfeng Bai Lili Li Fei Wen Wei Wu Liang Zheng Jiadong Cui |
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Affiliation: | 1. College of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, China;2. College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China |
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Abstract: | W/Cr co-doped Aurivillius-type CaBi2Nb2-x(W2/3Cr1/3)xO9 (CBN) (x?=?0.025, 0.050, 0.075, 0.100, and 0.150) piezoelectric ceramics were prepared by the conventional solid-state reaction method. The crystal structure, microstructure, dielectric properties, piezoelectric properties, and electrical conductivity of these ceramics were systematically investigated. After optimum W/Cr modification, the CBN ceramics showed both high d33 and TC. The ceramic with x?=?0.1 showed a remarkably high d33 value of ~15 pC/N along with a high TC of ~931?°C. Moreover, the ceramic also showed excellent thermal stability evident from the increase in its planar electromechanical coupling factor kp from 8.14% at room temperature to 11.04% at 600?°C. After annealing at 900?°C for 2?h, the ceramic showed a d33 value of 14?pC/N. Furthermore, at 600?°C, the ceramic also showed a relatively high resistivity of 4.9?×?105 Ω?cm and a low tanδ of 9%. The results demonstrated the potential of the W/Cr co-doped CBN ceramics for high-temperature applications. We also elucidated the mechanism for the enhanced electrical properties of the ceramics. |
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Keywords: | Aurivillius Piezoelectric properties Electrical resistivity |
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