Open AccessEffect of LiSbO3 on dielectric and piezoelectric properties of KNN ceramics
Author(s) -
R. R. Wang,
Y. L. Li,
Y. Tian,
Z. Q. Li
Publication year - 2022
Publication title -
digest journal of nanomaterials and biostructures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.256
H-Index - 44
ISSN - 1842-3582
DOI - 10.15251/djnb.2022.171.121
Subject(s) - materials science , dielectric , ceramic , piezoelectricity , phase boundary , grain size , relative density , grain boundary , doping , composite material , perovskite (structure) , crystal structure , phase (matter) , mineralogy , microstructure , chemical engineering , crystallography , optoelectronics , chemistry , organic chemistry , engineering
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.