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• W2053669255 abstract "Nanopowders of the lead-free ceramic system (K0.5−xLixNa0.5)(Nb0.9Ta0.1)O3 (KNN) with x = 0, 0.015, 0.045, and 0.060 have been synthesized by conventional solid state reaction followed by high-energy ball milling. The average particle size of all the milled powders as determined from the TEM analysis was about 35 nm. These powders were sintered at 1050 °C for 4 h. Analysis of all the ceramic samples using X-ray diffraction method showed single-phase perovskite structure with orthorhombic symmetry. The effects of the Li substitution on the structural, dielectric, and ferroelectric properties of the ceramics were systematically studied. Without any sintering aid such as ZnO, MnO2 and CuO, densities ≥95% of the theoretical density of the KNN ceramics has been achieved. The SEM analysis of fractured surfaces of the ceramics indicates that the fractures occur mostly within the grains. An increase in Li substitution in the KNN ceramics produced an increase in the Curie temperature (Tc) and a decrease in the coercive field (Ec). In the range of Li contents studied, the sample with x = 0.015 possessed the highest values in the density, orthorhombic–tetragonal transition temperature (Tot), dielectric constant (ɛ′), and remnant polarization (Pr)." @default.
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• W2053669255 date "2010-04-01" @default.
• W2053669255 modified "2023-09-27" @default.
• W2053669255 title "Structure and electrical properties of Li- and Ta-substituted K0.5Na0.5NbO3 lead-free piezoelectric ceramics prepared from nanopowders" @default.
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• W2053669255 doi "https://doi.org/10.1016/j.jallcom.2010.02.181" @default.
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