Structural, dielectric and piezoelectric features of (Na_0.52K_0.44Li_0.04)Nb_0.87Sb_0.08Ta_0.05O₃ ceramics

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• 作者：Juan Du^a ; ^{dujuanmk@gmail.com} ; Guo-Zhong Zang^b ; Xiu-Jie Yi^a ; Zhi-Jun Xu^a ; Rui-Qing Chu^a ; Chao-Lei Ban^a ; Yan-Yan Wei^a ; Pan-Pan Zhao^a ; Chun-Ming Wang^c
• 关键词：Lead-free ; Ceramics ; X-ray techniques ; Piezoelectric materials
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：15 July, 2012
• 卷：79
• 期：Complete
• 页码：89-91
• 文件大小：750 K

摘要

In this paper, two different processing routes were adopted for the preparation of lead-free (Na_0.52K_0.44Li_0.04)Nb_0.87Sb_0.08Ta_0.05O₃ ceramics and favorable results were obtained. The samples were characterized by X-ray techniques and scanning electron microscopy. Piezoelectric and dielectric data were presented. All the (Na_0.52K_0.44Li_0.04)Nb_0.87Sb_0.08Ta_0.05O₃ samples possessed pure perovskite phase, and not any secondary phase could be certified. Excellent piezoelectric properties of d₃₃ = 376pC/N, k_p = 44.1%and tan未 = 2.4%were obtained for the composition compounded with (Na_0.52K_0.44Li_0.04)NbO₃ and (Na_0.52K_0.44Li_0.04)Nb_0.74Sb_0.16Ta_0.1O₃ in the molar ratio 1:1. The remarkably strong piezoelectricity is probably due to the improved compositional homogeneity and enhanced densification achieved by the two-stage preparation method. The work will lead to further improvements in the properties of KNN-based piezoelectric materials.