Lead-free (Ba_0.85Ca_0.15)(Ti_0.9Zr_0.1)O₃-CeO₂ ceramics with high piezoelectric coefficient obtained by low-temperature sintering

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• 作者：Yerang Cui ; ^{cuiyerang@126.com} ; Xinyu Liu ; Minhong Jiang ; Xiayan Zhao ; Xu Shan ; Wenhua Li ; Changlai Yuan ; Changrong Zhou
• 关键词：A. Sintering ; C. Piezoelectric properties ; Dielectrics ; Lead-free ceramics
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：August, 2012
• 卷：38
• 期：6
• 页码：4761-4764
• 文件大小：644 K

摘要

Lead-free (Ba_0.85Ca_0.15)(Ti_0.9Zr_0.1)O₃-x%CeO₂(BCZT-xCe) piezoelectric ceramics have been prepared by the traditional ceramic process and the effects of CeO₂ addition on their phase structure and piezoelectric properties have been studied. The addition of CeO₂ significantly improves the sinterability of BCZT ceramics which results in a reduction of sintering temperature from 1540 掳C to 1350 掳C without sacrificing the high piezoelectric properties. X-ray diffraction data show that CeO₂ diffuses into the lattice of BCZT and a pure perovskite phase is formed. SEM images indicate that a small addition of CeO₂ greatly affects the microstructure. Main piezoelectric parameters are optimized at around x = 0.04 wt%with a high piezoelectric coefficient (d₃₃ = 600 pC/N), a planar electromechanical coefficient (k_p = 51%), a high dielectric constant (蓻_r = 4843) and a low dissipation factor (tan 未 = 0.012) at 1 kHz, which indicates that the BCZT-xCe ceramics are promising for lead-free practical applications.