Study on Dielectric and Ferroelectric Properties of Gd-Doped Sr₂Bi₄Ti₅O₁₈ Ceramics

Abstract:

Lead-free piezoelectric ceramics Sr₂Bi_4-xGd_xTi₅O₁₈ were prepared by conventional solid-state reaction method. Pure bismuth layered structural ceramics with uniform gain size were obtained in all samples. The effect of Gd-doping on the dielectric, ferroelectric and piezoelectric properties of Sr₂Bi₄Ti₅O₁₈ ceramics were also investigated. It was found that that Gd³⁺ dopant gradually decreased the Curie temperature (T_c) with the lower dielectric loss (tand) of SBTi ceramics. In addition, Gd-doping with appropriate content improved the ferroelectric and piezoelectric properties of the SBTi ceramics. The piezoelectric constant (d₃₃) of the Sr₂Bi_3.9Gd_0.1Ti₅O₁₈ ceramic reached the maximum value, which is 22 pC/N. The results showed that the Sr₂Bi_4-xGd_xTi₅O₁₈ ceramic was a promising lead-free piezoelectric material.

• Periodical: Advanced Materials Research (Volumes 328-330)
• Pages: 1131-1134
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.328-330.1131
• Online since: September 2011
• Authors: Qian Chen, Zhi Jun Xu, Rui Qing Chu, Yong Liu, Ming Li Chen, Xiu Hui Wang, Chun Jiao Ran, Guo Rong Li
• Keywords: Dielectric Property, Ferroelectric Property, Piezoelectric Properties, Sr₂Bi₄Ti₅O₁₈

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