Preparation and Properties of MnO_2 Doped KNN Based Lead-free Piezoceramics
Abstract：（1-x）（Na0.65K0.35）0.94Li0.06NbO3-xmol%MnO2 lead-free piezoceramics were prepared by conventional solid-state sintering method and their dielectric and piezoelectric characteristics were investigated.All samples possess tetragonal perovskite phases.The average grain size increases gradually with increasing MnO2 content.Appropriate amount of MnO2 results in an improvement in piezoelectric constants d33,planar electromechanical coupling factors kp,mechanical quality factors Qm,dielectric loss tanδ and promotes densification of the（Na0.65K0.35）0.94Li0.06NbO3 ceramics.Enhanced piezoelectric and electromechanical properties are obtained with x=0.50： d33=144pC/N,kp=42%,tanδ=2.4% and Qm=168,showing that they could be promising candidates as lead-free piezoelectric materials.
Keywords：lead-free piezoceramicspiezoelectric constantelectromechanical coupling factordielectric loss
Publication Date：2012-01-01
Online Publishing Date：2026-08-28(First online date of this platform, not the publication date of the document)
Pages：5( 61-65 )