Suppressed tanδ and enhanced Q_m in KCT and Ni₂O₃ co-modified [(K_0.43Na_0.57)_0.94Li_0.06] [(Nb_0.94Sb_0.06)_0.95Ta_0.05O₃ lead-free piezoelectric ceramics

详细信息    查看全文

• 作者：Qingfeng Zhang^a ; Fang Xu^a ; ^b ; Ronghuizi Yang^a ; Yinmei Lu^a ; Pai Li^a ; Xunzhong Shang^a ; Taosheng Zhou^a ; Yunbin He^a ; ^{ybhe@hubu.edu.cn}
• 关键词：KNN-based lead-free piezoelectric ceramics ; Enhanced mechanical quality factor ; Low dielectric loss ; High piezoelectric constant ; High power transducers
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：1 February 2017
• 年：2017
• 卷：43
• 期：2
• 页码：2537-2540
• 全文大小：803 K
• 卷排序：43

文摘

Effects of K5.4Cu1.3Ta10O29 (KCT) doping on structural and electrical properties of 0.05 mol% Ni2O3 modified [(K0.43Na0.57)0.94Li0.06][(Nb0.94Sb0.06)0.95Ta0.05]O3 (KNLNST) ceramics have been studied. It is found that the addition of suitable amount KCT can significantly enhance Qm and suppress tanδ while virtually maintaining d33 of the ceramics. The 0.2 mol% KCT added KNLNST +0.05 mol% Ni2O3 ceramic shows a high Qm (~180) and a very low tanδ (0.82%), which are respectively nearly four times and a quarter of those of pure KNLNST +0.05 mol% Ni2O3 ceramic. Meanwhile, d33 and kp of this ceramic maintain relatively high values (d33=287 pC/N, kp=46.2%). The dramatic change of Qm (tanδ) and virtual maintenance of d33 (kp) are mainly attributed to the effects of Cu2+ and K+ in KCT, respectively. High Qm and d33 but remarkably low tanδ indicates large potential of this ceramic for making high power transducer devices.