Title :
Ferroelectric and piezoelectric properties of lead-free (Bi1/2 Na1/2)TiO3-KNbO3-1/2(Bi2 O3·Sc2O3) ceramics
Author :
Takenaka, Tadashi ; Nagata, Hajime
Author_Institution :
Fac. of Sci. & Technol., Sci. Univ. of Tokyo, Japan
Abstract :
Bismuth sodium titanate, (Bi1/2N1/2)TiO3 (BNT)-based solid solution, a(Bi1/2N1/2)TiO3-bKNbO3 -c1/2(Bi2O3·Sc2 O3) (a+b+c=1), [KTNS(100a/100b/100c)], was studied for its ferroelectric and piezoelectric properties, as a new group of lead-free piezoelectric ceramics. Piezoelectric measurements show that the KTNS ceramics near the BNT side have a relatively high electromechanical coupling factor, k33(=0.47). On particular, the amount of modified Bi3+ ions has an effect on k33 . These ceramics seem to be a candidate for lead-free piezoelectric ceramics
Keywords :
bismuth compounds; ferroelectric Curie temperature; ferroelectric ceramics; permittivity; piezoceramics; potassium compounds; scandium compounds; sodium compounds; (Bi0.5Na0.5)TiO3-KNbO3 -(Bi2O3-Sc2O3)0.5 ; (Bi1/2Na1/2)TiO3-KNbO3 -1/2(Bi2O3·Sc2O3 ) ceramics; ferroelectric; high electromechanical coupling factor; piezoelectric properties; Bismuth; Ceramics; Crystalline materials; Dielectric measurements; Environmentally friendly manufacturing techniques; Ferroelectric materials; Piezoelectric materials; Solids; Temperature; Titanium compounds;
Conference_Titel :
Applications of Ferroelectrics, 1998. ISAF 98. Proceedings of the Eleventh IEEE International Symposium on
Conference_Location :
Montreux
Print_ISBN :
0-7803-4959-8
DOI :
10.1109/ISAF.1998.786755
