6533b7dbfe1ef96bd126fddc

RESEARCH PRODUCT

SYNTHESIS AND CHARACTERIZATION OF SB-SUBSTITUTED (K0.5Na0.5)NbO3 PIEZOELECTRIC CERAMICS

Andris SternbergK. BormanisR. KrutokhvostovM. LivinshAnatoly MishnovIlze SmeltereMaija AntonovaMaruta DambekalneAnna Kalvane

subject

Materials scienceDopingAnalytical chemistrySinteringTrigonal crystal systemDielectricCondensed Matter PhysicsMicrostructurePiezoelectricityElectronic Optical and Magnetic MaterialsCharacterization (materials science)Control and Systems Engineeringvisual_artMaterials ChemistryCeramics and Compositesvisual_art.visual_art_mediumCeramicElectrical and Electronic Engineering

description

ABSTRACT Lead-free piezoelectric ceramics (K0.5Na0.5)(Nb1-xSbx)O3+0.5 mol.%MnO2, where x = 0 ÷ 0.10, with single phase structure and rhombohedral symmetry at room temperature were prepared by conventional ceramic technology. The optimal sintering temperatures of compositions were within 1100°–1140°C. MnO2 functions as a sintering aid and effectively improves the densification. The samples reached density from 4.26 g/cm3 for undoped (K0.5Na0.5)NbO3 to 4.40 g/cm3 for Mn/Sb5+ co-doped ceramics. The co-effects of MnO2 doping and Sb5+ substitution lead to significant improvement in dielectric and piezoelectric properties: e at the Tc increased from 6000 (KNN) to 12400 (x = 0.04), d33 = 92 ÷ 192 pC/N, kp = 0.32 ÷ 0.46, kt = 0.34 ÷ 0.48.

yearjournalcountryeditionlanguage
2008-12-09Integrated Ferroelectrics
https://doi.org/10.1080/10584580802558043