Effect of K4CuNb8O23 and La2O3 co-doping on the piezoelectric and dielectric properties of (K0.5Na0.5)(Nb0.96Sb0.04)O3 ceramics

Author

Jeong, Yeongho ; Hong, Jaeil ; Seo, Byeong-Ho ; Oh, YoungKwang ; Yoo, Juhyun ; Hwang, Larkhoon

Author_Institution

Dept. of Electr. Eng., Chungju Univ., Chungju, South Korea

fYear

2010

fDate

9-12 Aug. 2010

Firstpage

1

Lastpage

5

Abstract

In this study, (K_0.5Na_0.5)-(Nb_0.94Sb_0.04)O₃ + 1.2mol% K₄CuNb₈O₂₃ + xmol%La₂O₃ ceramics was prepared by conventional solid-state sintering method. The effect of La₂O₃ on the crystal structure, dielectric and piezoelectric properties of the ceramics were investigated in order to improve the electrical and piezoelectric properties of lead-free piezoelectric ceramics. The density and the dielectric constant increased with increasing the amount of La₂O₃ content. So, Electromechanical coupling factor (kp) and piezoelectric constant (d₃₃) of the ceramics were considerably improved. At the 0.2mol% La₂O₃ added composition ceramics sintered at 1080°C, kp, d₃₃ and g₃₃ showed optimum values of 0.38, 160pC/N and 37.4[10^-3V·m/N], respectively.

Keywords

copper compounds; crystal structure; doping; lanthanum compounds; permittivity; piezoceramics; potassium compounds; sintering; sodium compounds; (K_0.5Na_0.5)(Nb_0.94Sb_0.04)O₃:K₄CuNb₈O₂₃,La₂O₃; crystal structure; dielectric constant; electromechanical coupling factor; piezoelectric ceramics; piezoelectric constant; solid-state sintering method; temperature 1080 degC; Ceramics; Dielectric constant; Lead; Periodic structures; Piezoelectric devices; Powders; lead-free; piezoelectric; piezoelectric voltage constant;

fLanguage

English

Publisher

ieee

Conference_Titel

Applications of Ferroelectrics (ISAF), 2010 IEEE International Symposium on the

Conference_Location

Edinburgh

ISSN

1099-4734

Print_ISBN

978-1-4244-8190-3

Electronic_ISBN

1099-4734

Type

conf

DOI

10.1109/ISAF.2010.5712222

Filename

5712222