Dielectric, ferroelectric and field-induced strain response of lead-free (Fe, Sb)-modified (Bi_0.5Na_0.5)_0.935Ba_0.065TiO₃ ceramics

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• 作者：Liangliang Li ; Jigong Hao ; Ruiqing Chu ; ^{rqchu@lcu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Zhijun Xu ; Wei Li ; Juan Du ; Peng Fu
• 关键词：Ceramics ; Phase transition ; Ferroelectricity ; Field-induced strain
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：42
• 期：8
• 页码：9419-9425
• 全文大小：2357 K

文摘

Lead-free piezoelectric ceramics (Bi_0.5Na_0.5)_0.935Ba_0.065Ti_1−x(Fe_0.5Sb_0.5)_xO₃ (BNBT6.5–xFS, x=0.005, 0.010, 0.015, 0.020) were prepared by a conventional solid sintering technique. The effects of B-site doping of (Fe, Sb) on the phase structure, microstructure, dielectric, ferroelectric, and piezoelectric properties of BNBT6.5 ceramics were systematically investigated. Results showed that (Fe, Sb) can completely diffuse in the BNBT6.5 lattice in the all studied components. The addition of (Fe, Sb) destroyed the ferroelectric long-range order, and thus promoted the electric field induced strain response. The maximum electric field-induced strain (S_max=0.37%) with normalized strain (d₃₃*=S_max/E_max=454 pm/V) at an applied electric field of 80 kV/cm was obtained at x=0.015. Temperature dependent measurements of both polarization and strain from room temperature to 120 °C suggested that the origin of the large strain is due to a reversible field-induced ergodic relaxor to ferroelectric phase transformation.