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• W1589968216 abstract "A lead-free solid solution between potassium sodium niobate and silver niobate, (1−x)K0.5Na0.5NbO3–xAgNbO3 (KNN-AN, with x=0–0.36), has been prepared in the form of ceramics by solid state reaction under O2 atmosphere. The crystal chemical study shows that Ag+ ion diffuses into the KNN lattices to form a solid solution of perovskite structure with x up to 0.30. The substitution of Ag+ ion for (K0.5Na0.5)+ ion results in linear decreases in the ferroelectric Curie temperature (TC), from 420°C in KNN down to 325°C in 0.70KNN-0.30AN, and in the tetragonal to orthorhombic phase transition temperature (TT-O), from 190 down to 150°C. The relative density of the KNN-AN ceramics reaches 94%. The optimum piezoelectric properties are found in the ceramics of 0.82KNN-0.18AN, with a piezocoefficient d33=186pC∕N, an electromechanical coupling factor kp=42.5%, and a TC=355°C. For the ceramics with x=0.24, the remanent polarization reaches a maximum value of Pr=20μC∕cm2, with a reduced coercive field Ec=6.4kV∕cm and a TC=340°C. It is shown that the (1−x)KNN-xAN ceramics exhibit piezoelectric properties which are comparable or superior to the hot-pressed KNN ceramics and other KNN-based systems. In particular, the piezoelectric properties exhibit very a good thermal stability up to high temperature, which is a significant improvement from other KNN-based piezoceramics." @default.
• W1589968216 created "2016-06-24" @default.
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• W1589968216 date "2008-07-28" @default.
• W1589968216 modified "2023-10-09" @default.
• W1589968216 title "Lead-free piezoelectric ceramics derived from the K0.5Na0.5NbO3–AgNbO3 solid solution system" @default.
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• W1589968216 doi "https://doi.org/10.1063/1.2956410" @default.
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