作者: Chao Lei , Zuo-Guang Ye
DOI: 10.1063/1.2956410
关键词:
摘要: 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 state reaction under O2 atmosphere. The crystal chemical study shows that Ag+ ion diffuses into KNN lattices to a perovskite structure x up 0.30. substitution for (K0.5Na0.5)+ results linear decreases ferroelectric Curie temperature (TC), from 420°C down 325°C 0.70KNN-0.30AN, tetragonal orthorhombic phase transition (TT-O), 190 150°C. relative density KNN-AN reaches 94%. optimum piezoelectric properties are found 0.82KNN-0.18AN, piezocoefficient d33=186pC∕N, an electromechanical coupling factor kp=42.5%, TC=355°C. For x=0.24, remanent polarization maximum value Pr=20μC∕cm2, reduced coercive field Ec=6.4kV∕cm T...