Phase transition behavior and electrical properties of (1 ? x)Bi0.5Na0.5TiO3–x(Na0.53K0.44Li0.04)(Nb0.88Sb0.08Ta0.04)O3 lead-free ceramics |
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| Authors: | Hong-Qiang Wang Ye-Jing Dai Zhu-Rui Shen Xiao-Wen Zhang |
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| Affiliation: | 1. Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, PR China;2. The State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China;1. International Center for Actuators and Transducers (ICAT), The Pennsylvania State University, University Park, PA, 16802, USA;2. R&D Department, PI Ceramic GmbH, Lindenstrasse, 07589, Lederhose, Germany;1. College of Materials and Metallurgy, Guizhou University, Guiyang 550025, Guizhou, PR China;2. Key Laboratory for Material Structure and Strength of Guizhou Province, Guiyang 550025, Guizhou, PR China |
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| Abstract: | (1 ? x)Bi0.5Na0.5TiO3–x(Na0.53K0.44Li0.04)(Nb0.88Sb0.08Ta0.04)O3 (BNT–xNKLNST) with x = 0–0.10 lead-free piezoelectric ceramics were prepared by a solid state method, and the structure and electrical properties were investigated in this study. It is found that a morphotropic phase boundary (MPB) of rhombohedral (R) and tetragonal (T) phase exists in the range of 0.03 ≤ x ≤ 0.05 and the structure changes to paraelectric phase when x > 0.07. The samples with x = 0.05 exhibit improved electrical properties owing to the formation of MPB, which are as follows: piezoelectric constant d33 = 120 pC/N, remnant polarization Pr = 39.4 μC/cm2 and coercive field Ec = 3.6 kV/mm. These results indicate that the enhanced piezoelectric properties for BNT can be achieved by forming the coexistence of R and T phase. |
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