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Composition-driven Phase Boundary and Piezoelectricity in Potassium-Sodium Niobate -based Ceramics Ting Zheng, Jiagang Wu, Dingquan Xiao, Jianguo Zhu, Xiangjian Wang, and Xiaojie Lou ACS Appl. Mater. Interfaces, Just Accepted Manuscript • DOI: 10.1021/acsami.5b06033 • Publication Date (Web): 24 Aug 2015 Downloaded from http://pubs.acs.org on August 25, 2015
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Composition-driven Phase Boundary and Piezoelectricity in Potassium-Sodium Niobate -based Ceramics
Ting Zheng, Jiagang Wu*, Dingquan Xiao, and Jianguo Zhu Department of Materials Science, Sichuan University, Chengdu 610064, P. R. China Xiangjian Wang and Xiaojie Lou Multi-disciplinary Materials Research Center, Frontier Institute of Science and Technology, and State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, P. R. China
Abstract: 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 boundaries types in (K,Na)(Nb,Sb)O3-Bi0.5Na0.5AO3 (KNNS-BNA, A= Hf, Zr, Ti, Sn) ceramics, and then their piezoelectricity can be readily modified. Their phase boundaries types are determined by the doped elements. A rhombohedral-tetragonal (R-T) phase boundary can be driven in the compositions range of 0.035≤BNH≤0.040 and 0.035≤BNZ≤0.045, an orthorhombic-tetragonal (O-T) phase boundary is formed in the composition range of 0.005≤BNT≤0.02, and a pure O phase can be only observed regardless of BNS content (≤0.01). In addition, the phase boundaries types strongly affect their corresponding piezoelectricity. A larger d33 (~440-450 pC/N) and a higher d33* (~742-834 pm/V) can be attained in KNNS-BNA (A=Zr and Hf) ceramics due to the involvement of R-T phase boundary, and unfortunately KNNS-BNA (A=Sn and Ti) ceramics possess a relatively poor piezoelectricity (d33≤200 and d33*
