Title :
(Bi1/2Na1/2)TiO3-PbTiO3 -BaTiO3 solid solution for piezoelectric ceramics
Author :
Takenaka, Tadashi ; Naitou, Yuichi ; Takahashi, Norikazu ; Sakata, Koichiro
Author_Institution :
Fac. of Sci. & Technol., Sci. Univ. of Tokyo, Japan
Abstract :
Piezoelectric and ferroelectric properties of a bismuth sodium titanate, (Bi1/2Na1/2)TiO3 (BNT)-based solid solution, (Bi1/2Na1/21-x) (PbaBa b)x TiO3 (a+b=1) (BNTX), were studied from the viewpoint of a new group of lead-free or low-lead-content piezoelectric ceramics with a rhombohedral (F α)-tetragonal (Fβ) morphotropic phase boundary. A rhombohedral (Fα)-tetragonal (Fβ) morphotropic phase boundary was shown to exist at x≃0.135 in the case of b=0. BNTX ceramics are superior for piezoceramics applications in high-frequency ultrasonic uses, with a lower free permittivity ∈33 T/∈0 , and a high electromechanical coupling factor kt or k33 along with a high mechanical strength
Keywords :
barium compounds; bismuth compounds; ceramics; dielectric hysteresis; ferroelectricity; high-frequency effects; lead compounds; mechanical strength; permittivity; phase equilibrium; piezoelectricity; sodium compounds; (Bi0.5Na0.5)TiO3-PbTiO3 -BaTiO3; BNT; BNTX; electromechanical coupling factor; ferroelectric properties; free permittivity; high-frequency ultrasonic uses; hysteresis; mechanical strength; morphotropic phase boundary; piezoelectric ceramics; rhombohedral-tetragonal boundary; solid solution; Atmospheric measurements; Bismuth; Ceramics; Dielectric measurements; Environmentally friendly manufacturing techniques; Ferroelectric materials; Piezoelectric materials; Pyroelectricity; Solids; Temperature;
Conference_Titel :
Applications of Ferroelectrics, 1990., IEEE 7th International Symposium on
Conference_Location :
Urbana-Champaign, IL
Print_ISBN :
0-7803-0190-0
DOI :
10.1109/ISAF.1990.200250
