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- W1605938966 abstract "Based on the discussion on the “origin” of the high piezoelectric properties of Pb-based piezoelectric ceramics, it was predicted that (K0.5Na0.5)NbO3–BiMeO3 solid solutions (where Me3+=Sc, Al, Ga, Y, In, etc.) should possess high piezoelectric properties because of the formation of the morphotropic phase boundary and the hybridization between the Bi 6p and O 2p orbits. (1−x)(K0.5Na0.5)NbO3–xBiScO3 [(1−x)KNN-xBS] ceramics were selected as an example to verify this prediction. (1−x)KNN-xBS ceramics were synthesized by conventional solid-state sintering. The phase structure, microstructure, and dielectric and piezoelectric properties of (1−x)KNN-xBS ceramics were investigated. At room temperature, the polymorphic phase transition (PPT) (from the orthorhombic to the tetragonal phase) in (1−x)KNN-xBS ceramics is identified at x=0.0175 by the analysis of x-ray diffraction patterns and dielectric spectroscopy. The ceramics (x=0.0175) with PPT near room temperature exhibit excellent electrical properties (d33=∼253 pC/N, kp=0.48, kt=0.49, and TC=351 °C). The related mechanisms for the high piezoelectric properties in (1−x)KNN-xBS (x=0.0175) ceramics are also systematically discussed. Compared to the other KNN-based ceramics and hard Pb(Zr,Ti)O3 ceramics, it is concluded that the (1−x)KNN-xBS (x=0.0175) ceramic is a promising lead-free piezoelectric candidate material. In addition, this article could provide an alternative approach for the development of lead-free piezoelectric ceramics." @default.
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- W1605938966 date "2008-08-01" @default.
- W1605938966 modified "2023-10-16" @default.
- W1605938966 title "Design and electrical properties’ investigation of (K0.5Na0.5)NbO3–BiMeO3 lead-free piezoelectric ceramics" @default.
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- W1605938966 doi "https://doi.org/10.1063/1.2964100" @default.
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