Composition-Driven Phase Boundary and Piezoelectricity in Potassium鈥揝odium Niobate-Based Ceramics

详细信息    查看全文

• 作者：Ting Zheng ; Jiagang Wu ; Dingquan Xiao ; Jianguo Zhu ; Xiangjian Wang ; Xiaojie Lou
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 16, 2015
• 年：2015
• 卷：7
• 期：36
• 页码：20332-20341
• 全文大小：908K
• ISSN：1944-8252

文摘

The piezoelectricity of (K,Na)NbO₃ ceramics strongly depends on the phase boundary types as well as the doped compositions. Here, we systematically studied the relationships between the compositions and phase boundary types in (K,Na) (Nb,Sb)O₃鈥揃i_0.5Na_0.5AO₃ (KNNS-BNA, A = Hf, Zr, Ti, Sn) ceramics; then their piezoelectricity can be readily modified. Their phase boundary types are determined by the doped elements. A rhombohedral-tetragonal (R鈥揟) phase boundary can be driven in the compositions range of 0.035 鈮?BNH 鈮?0.040 and 0.035 鈮?BNZ 鈮?0.045; an orthorhombic-tetragonal (O鈥揟) phase boundary is formed in the composition range of 0.005 鈮?BNT 鈮?0.02; and a pure O phase can be only observed regardless of BNS content (鈮?.01). In addition, the phase boundary types strongly affect their corresponding piezoelectricities. A larger d₃₃ (鈭?40鈥?50 pC/N) and a higher d₃₃* (鈭?42鈥?34 pm/V) can be attained in KNNS-BNA (A = Zr and Hf) ceramics due to the involvement of R鈥揟 phase boundary, and unfortunately KNNS-BNA (A = Sn and Ti) ceramics possess a relatively poor piezoelectricity (d₃₃ 鈮?200 and d₃₃* < 600 pm/V) due to the involvement of other phase structures (O鈥揟 or O). In addition, the underlying physical mechanisms for the relationships between piezoelectricity and phase boundary types were also discussed. We believe that comprehensive research can design more excellent ceramic systems concerning potassium鈥搒odium niobate.