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Erschienen in:
01.05.2011
Preparation and piezoelectric properties of CuO-doped (Na0.5K0.5)NbO3 ceramics by the citrate precursor method
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 5/2011
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Abstract
A low-cost citrate so-gel route was investigated to synthesize nano-sized crystalline powders (<100 nm) of 1 mol% CuO modified (Na0.5K0.5)NbO3 compositions. It was found that amorphous gels can be transformed into crystallite powders with single-phase perovskite structure when calcined at 500–600 °C for 3 h. The transmission electron microscopy observation showed that the particles are column-like and well dispersed, depending on the calcination condition. The as-pressed samples exhibit improved densification behavior and finer grain morphology after sintering. Electrical properties of the samples sintered at 1,060 °C are as follows: dielectric constant ε
r
= 605, piezoelectric constant d
33 ~ 117 pC/N, planar electromechanical coupling factor k
p
~ 0.38 and mechanical quality factor Q
m
~ 725.