Title :
Low-lead-content piezoelectric ceramics based on (Bi1/2Na1/2)TiO3-NaNbO3 -PbTiO3
Author :
Takenaka, Tadashi ; Okuda, Takeo ; Kondo, Naohiro ; Sakata, Koichiro
Author_Institution :
Fac. of Sci., Sci. Univ. of Tokyo, Japan
Abstract :
Dielectric, ferroelectric and piezoelectric properties of a bismuth sodium titanate, (Bi1/2Na1/2)TiO3 [BNT]-based three component solid solution, a·(Bi1/2 Na1/2)TiO3-b·NaNbO3 -c·PbTiO3 [BNTP(100a/100b/100c)] are studied from the viewpoint of non-lead-based piezoelectric ceramics. The Curie temperature is around 300°C at the optimum composition for piezoelectric properties. D-E hysteresis loops of the BNTP near BNT side show a relatively large remanent polarization, Pr, of about 20-30 μC/cm2 and a high coercive field of about 50 kV/cm. The maximum electromechanical coupling factor, kt in the thickness mode was 0.53 at a=0.84, b=0.03 and c=0.13. BNTP ceramics seem to be efficacious for low lead-content piezoelectric ceramics for environmental protections
Keywords :
bismuth compounds; dielectric hysteresis; ferroelectric Curie temperature; ferroelectric materials; lead compounds; piezoceramics; sodium compounds; (Bi1/2Na1/2)TiO3-NaNbO3 -PbTiO3; BNTP; BiNaTiO3-NaNbO3-PbTiO3; Curie temperature; bismuth sodium titanate; coercive field; dielectric properties; electromechanical coupling factor; environmental protection; ferroelectric properties; hysteresis loop; piezoelectric ceramic; piezoelectric properties; remanent polarization; solid solution; thickness mode; Bismuth; Ceramics; Dielectrics; Ferroelectric materials; Hysteresis; Piezoelectric polarization; Protection; Solids; Temperature; Titanium compounds;
Conference_Titel :
Applications of Ferroelectrics, 1996. ISAF '96., Proceedings of the Tenth IEEE International Symposium on
Conference_Location :
East Brunswick, NJ
Print_ISBN :
0-7803-3355-1
DOI :
10.1109/ISAF.1996.602745
