Title :
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
Abstract :
In this study, (K0.5Na0.5)-(Nb0.94Sb0.04)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; (K0.5Na0.5)(Nb0.94Sb0.04)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;
Conference_Titel :
Applications of Ferroelectrics (ISAF), 2010 IEEE International Symposium on the
Conference_Location :
Edinburgh
Print_ISBN :
978-1-4244-8190-3
Electronic_ISBN :
1099-4734
DOI :
10.1109/ISAF.2010.5712222
