Fabrication of lead-free piezoelectric (Na(0.5)K(0.5))NbO(3) ceramics by a modified solid-state reaction method.
Sodium potassium niobate, (Na(0.5)K(0.5))NbO(3), fine powder has been successfully synthesized at the low temperature of 550 degrees C through a modified solid-state reaction method, in which urea [CO(NH(2))(2)] plays an important role. High-density (Na(0.5)K(0.5))NbO(3) ceramics could be obtained by conventional sintering of the synthesized (Na(0.5)K(0.5))NbO(3) fine powder with the addition of 0.03 mol% Co(3)O(4) as a sintering additive. The crystal structure, microstructure, and dielectric and piezoelectric properties were characterized. The (Na(0.5)K(0.5))NbO(3) ceramic showed a comparatively saturated P-E hysteresis loop. The (Na(0.5)K(0.5))NbO(3) ceramic also displayed piezoelectricity with a piezoelectric constant d(33) of 126 pC/N and a planar electromechanical coupling factor k(p) of 33%.
Department of Materials Chemistry, Ryukoku University, Seta, Otsu 520-2194, Japan.
M
M
Fukada
T
T
Saito
H
H
Kume
T
T
Wada
D002516:Ceramics / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D017097:Electric Impedance; D004563:Electrochemistry / Q000379:methods*; D007854:Lead / Q000737:chemistry; D008422:Materials Testing; D044367:Phase Transition
D007854:Lead