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

fYear

2007

fDate

27-31 May 2007

Firstpage

690

Lastpage

691

Abstract

Sodium potasium niobate, (Na_0.5K_0.5)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 (Na_0.5K_0.5)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 (Na_0.5K_0.5)NbO₃ ceramics show a comparatively saturated P-E hysteresis loop. The (Na_0.5K_0.5)NbO₃ ceramics also show piezoelectricity with a piezoelectric constant, d₃₃, of 126 pC/N and a planar electromechanical coupling factor, k_p, of 33%..

Keywords

crystal microstructure; crystal structure; dielectric hysteresis; electromechanical effects; lead compounds; piezoceramics; Na_0.5K_0.5NbO₃; 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;

fLanguage

English

Publisher

ieee

Conference_Titel

Applications of Ferroelectrics, 2007. ISAF 2007. Sixteenth IEEE International Symposium on

Conference_Location

Nara

ISSN

1099-4734

Print_ISBN

978-1-4244-1334-8

Electronic_ISBN

1099-4734

Type

conf

DOI

10.1109/ISAF.2007.4393372

Filename

4393372