Microstructure, crystalline phase and electrical properties of Li0.06(Na0.5K0.5)0.94Nb(1?2x/5)Mg
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O3 lead-free piezoelectric ceramics |
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Authors: | Hai-tao Li Bo-ping Zhang Qian Zhang Peng-peng Shang Gao-lei Zhao |
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Institution: | 1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China 2. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang, 471003, China
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Abstract: | MgO-modified Li0.06(Na0.5K0.5)0.94NbO3 (L6NKN) lead-free piezoelectric ceramics were synthesized by normal sintering at a relatively low temperature of 1000°C. The crystalline phase, microstructure, and electrical properties of the ceramics were investigated with a special emphasis on the influence of MgO content. The addition of MgO effectively improves the sinterability of the L6NKN ceramics. X-ray diffraction analysis indicates that the morphotropic phase boundary (MPB) separating orthorhombic and tetragonal phases for the ceramics lies in the range of Mg doping content (x) from 0.3at% to 0.7at%. High electrical properties of the piezoelectric constant (d 33=238 pC/N), planar electromechanical coupling coefficient (k p=41.5%), relative dielectric constant (? r=905), and remanent polarization (P r=38.3 μC/cm2) are obtained from the specimen with x=0.5at%, which suggests that the Li0.06(Na0.5K0.5)0.94Nb(1?2x/5)Mg x O3 (x=0.5at%) ceramic is a promising lead-free piezoelectric material. |
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