Abstract
K2CO3, Na2CO3, Li2CO3, Sb2O3 and Nb2O5 were used as the starting materials, the (K0.5Na0.5)NbO3-x mol% LiSbO3 (x=0.00, 0.01, 0.02, 0.03, 0.04 and 0.05) ceramics are prepared using solid state synthesis method, and the effects of LiSbO3 content on dielectric and piezoelectric properties of (K0.5Na0.5)NbO3 ceramics are investigated. The results show that the crystal structure for (Na0.5K0.5)NbO3 ceramics with different LiSbO3 content is all perovskite structure, and the new phase structure of KNN ceramics can’t be obtained when the LiSbO3 content is 0.00≤ x ≤0.05. The appropriate amount of LiSbO3 doped KNN ceramics can refine the grain size and increase the density of the ceramics. When x = 0.04, the relative dielectric constant reaches 980, the dielectric loss is 0.055, and the combined effect of Li+ and Sb 5+ makes the KNN ceramics have better dielectric properties. Due to the more easily the domain wall rotates at the grain boundary, the (K0.5Na0.5)NbO3 ceramics doped with 4 mol% LiSbO3 shows excellent piezoelectric properties in the system of study, and the piezoelectric constant d33 increases sharply to the maximum value of 126 pC/N.
Highlights
With the social progress and the rapid development of science and technology, the performance of ceramic materials is more and more demanding, and new ceramic materials come into being [1-3]
As one of the functional ceramic materials, piezoelectric ceramics can realize the mutual conversion between mechanical energy and electrical energy, and its typical applications include underwater transducer, ceramic transformer, piezoelectric motor, imaging equipment [4,5], etc., and many equipments in the ship involve the application of such devices
Many countries have legislated to ban the use of electronic materials containing lead, the research on lead-free piezoelectric ceramics meeting the environmental requirements and practical applications has become a hot topic for researchers [9,10]
Summary
With the social progress and the rapid development of science and technology, the performance of ceramic materials is more and more demanding, and new ceramic materials come into being [1-3]. In 2004, Saito [11] et, al studied a kind of textured KNN ceramics containing Li, Ta and Sb, and its piezoelectric coefficient d33 can reach 416 PC / N, which makes KNN based ceramics become a kind of hot material in the field of lead-free piezoelectric materials. Due to the difference of ion radius and electronegativity, the lattice of KNN will be distorted to some extent, so that a certain small stress will be generated inside the crystal cell of KNN. LiSbO3 is used as dopant to improve the piezoelectric properties, and the effects of LiSbO3 content on the crystal structure, microstructure, dielectric properties and piezoelectric properties of KNN base ceramics were studied
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