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Erschienen in:
01.02.2013
Effects of V2O5 doping on the structure and properties lead-free KNN–LS–BF piezoelectric ceramics
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 2/2013
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Abstract
Lead-free [0.996(0.95Na0.5K0.5NbO3–0.05LiSbO3)–0.004BiFeO3]–xmol %V2O5 (KNN–LS–BF–xV2O5) piezoelectric ceramics have been fabricated by the solid-state reaction process and the effects of V2O5 doping on the structure and properties of the ceramics have been studied. The results reveal that the addition of V2O5 significantly improves the sinterability of KNN–LS–BF ceramics and the comprehensive properties. X-Ray diffraction (XRD) data shows that a small amount of V2O5 do not change the phase structure of KNN–LS–BF with smaller and more uniform grains. Main property parameters of KNN–LS–BF–xV2O5 ceramics sintered at a low temperature of 1,060 °C are optimized around x = 0.3 mol % with a high piezoelectric coefficient d
33 of 183pC/N, a planar electromechanical coefficient k
p
of 0.25, a high dielectric constant ε
r
of 638.83 and a low dielectric loss tanδ of 0.7 % at 1 kHz, as well as a high mechanical quality factor Q
m
of 53.87.