Structure-property in KNNS-BNT-BNH ternary system with rhombohedral-tetragonal phase boundary

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• 作者：Chaoyu Zhang ; Ting Zheng ; Jiagang Wu ; ^{wujiagang0208@163.com" class="auth_mail" title="E-mail the corresponding author} ; ^{msewujg@scu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Potassium-sodium niobate ; Ternary system ; R-T phase boundary ; Electrical properties
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：1 November 2016
• 年：2016
• 卷：42
• 期：14
• 页码：16049-16054
• 全文大小：3534 K

文摘

We have attained a large piezoelectricity in (1−x−z)(K_0.48Na_0.52)(Nb_1−ySb_y)O₃−zBi_0.5Na_0.5TiO₃−xBi_0.5Na_0.5HfO₃ ternary lead free ceramics prepared by the conventional solid-state sintering method, where the rhombohedral-tetragonal (r−T) phase boundary was formed in the composition range 0.015≤x≤0.04 (y=0.05, z=0.01), 0.06≤y≤0.08 (x=0.015, z=0.01) as well as 0.0075≤z≤0.02 (x=0.015, y=0.07). A large piezoelectric constant (d₃₃) i.e. 415 pC/N was observed in the ceramics with x=0.015, y=0.07 and z=0.0075 by forming an R-T phase boundary. As a result, the addition of BNT, BNH and Sb can significantly affect the phase structure and electrical properties of the ceramics.