Title :
Fabrication of Lead-Free Piezoelectric (Na0.5K0.5)NbO3 Ceramics by Modified Solid State Reaction Method
Author :
Fukada, M. ; Saito, T. ; Wada, T.
Author_Institution :
Ryukoku Univ., Otsu
Abstract :
Sodium potasium niobate, (Na0.5K0.5)NbO3 fine powder has been successfully synthesized at a low temperature of 550degC through a modified solid state reaction, in which urea [CO(NH2)2] plays an important role. High-density (Na0.5K0.5)NbO3 ceramics can be obtained by a conventional sintering with an addition of 0.03 mol% Co3O4. Their crystal structure, microstructure, and dielectric and piezoelectric properties were characterized. The (Na0.5K0.5)NbO3 ceramics show a comparatively saturated P-E hysteresis loop. The (Na0.5K0.5)NbO3 ceramics also show piezoelectricity with a piezoelectric constant, d33, of 126 pC/N and a planar electromechanical coupling factor, kp, of 33%..
Keywords :
crystal microstructure; crystal structure; dielectric hysteresis; electromechanical effects; lead compounds; piezoceramics; Na0.5K0.5NbO3; crystal structure; dielectric properties; hysteresis loop; microstructure; piezoelectric ceramics; piezoelectric properties; planar electromechanical coupling factor; sodium potassium niobate; temperature 550 degC; Ceramics; Crystal microstructure; Dielectrics; Environmentally friendly manufacturing techniques; Fabrication; Hysteresis; Niobium compounds; Powders; Solid state circuits; Temperature;
Conference_Titel :
Applications of Ferroelectrics, 2007. ISAF 2007. Sixteenth IEEE International Symposium on
Conference_Location :
Nara
Print_ISBN :
978-1-4244-1334-8
Electronic_ISBN :
1099-4734
DOI :
10.1109/ISAF.2007.4393372
