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• W2020403713 abstract "Lead-free piezoelectric ceramics Sr2−xCaxNaNb5O15 + y wt% MnO2have been prepared by the conventional solid state reaction method. Our results reveal that Ca2+and Mn ions have entered into the Sr2NaNb5O15 lattices to form a solid solution with tungsten–bronze structure. The substitution of Ca2+ induces a decrease in piezoelectric coefficient d33, electromechanical coupling factors kp and kt, while, the addition of Mn ions decreases the sintering temperature and effectively promotes the densification of the ceramics. The effect of substitution of Ca2+and Mn ions on the structure, electrical properties and diffused phase changing were investigated systematically. For the ceramic with x = 0.05 and y = 0.5, the piezoelectric, dielectric and ferroelectric properties become optimum, giving a piezoelectric coefficient d33 = 190 pC/N, electromechanical coupling factors kp = 13.4% and kt = 36.5%, ɛr = 2123, loss tangent tan δ = 0.038, remanent polarization Pr = 4.76 μC/cm2, coercive field Ec = 12.68 kV/cm, and Curie temperature Tc = 260 °C." @default.
• W2020403713 created "2016-06-24" @default.
• W2020403713 creator A5023230051 @default.
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• W2020403713 date "2011-06-01" @default.
• W2020403713 modified "2023-10-02" @default.
• W2020403713 title "Structure and electrical properties of MnO2-doped Sr2−xCaxNaNb5O15 lead-free piezoelectric ceramics" @default.
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• W2020403713 doi "https://doi.org/10.1016/j.jallcom.2011.03.130" @default.
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