An enhanced mechanical quality factor and a low dielectric loss in lithium sodium niobate lead-free ceramics

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• 作者：Xiaojing Cheng ; Jiagang Wu ; ^{msewujg@scu.edu.cn} ; ^{wujiagang0208@163.com} ; Dingquan Xiao ; Jianguo Zhu
• 关键词：C. Piezoelectric properties ; Lead-free ceramics ; Ion substitution ; Mechanical quality factor
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：July, 2012
• 卷：38
• 期：5
• 页码：4023-4027
• 文件大小：916 K

摘要

(Li_0.12Na_0.88)(Nb_0.96鈭?em>xSb_0.04Ta_x)O₃ (LNNST) ceramics were fabricated by the normal sintering. These LNNST ceramics endure a phase transition from an orthorhombic phase, a coexistence of orthorhombic and tetragonal phases, to a tetragonal phase with increasing Ta content. Dense microstructure has been developed for all ceramics. The T_c decreases and the 蓻_r increases with increasing Ta content, together with a very low dielectric loss of less than 1.3%. A high Q_m value of 鈭?230 is demonstrated for the ceramic with x = 0.06. Enhanced piezoelectric properties are also demonstrated for the ceramic with x = 0.03 because of a coexistence of two phases. Therefore, this ceramic is a promising candidate for the transducer and transformer applications.