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Piezoelectric ceramics of (Bi 1/2 Na 1/2 )TiO 3 ‐PbTiO 3 ‐BaTiO 3 system
Author(s) -
Takenaka Tadashi,
Naitou Yuichi,
Sakata Koichiro
Publication year - 1992
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391120709
Subject(s) - materials science , phase boundary , piezoelectricity , poling , dielectric , permittivity , tetragonal crystal system , ceramic , ferroelectricity , bismuth , mineralogy , pyroelectricity , bismuth titanate , analytical chemistry (journal) , titanate , phase (matter) , crystal structure , composite material , crystallography , optoelectronics , physics , metallurgy , chemistry , chromatography , quantum mechanics
Piezoelectric and ferroelectric properties of bismuth sodium titanate, (Bi 1/2 Na 1/2 )TiO 3 (BNT)‐based solid solution, that is, (Bi 1/2 Na 1/2 )( 1‐x )(Pb a Ba b ) x TiO 3 ( a + b = 1) [BNPB(100 x ‐100 a /100 b )], are studied from the viewpoint of a new group of lead‐free or low‐lead content piezo‐electric ceramics with a rhombohedral( F a ‐tetragonal ( F β ) morphotropic phase boundary (MPB). It is evident that the MPB seems to be remarkably efficacious in promoting piezoelectric and pyroelectric activities by electrical poling. X‐ray diffraction data, dielectric properties and D‐E hysteresis loops show that the MPB exist near (Bi 1/2 Na 1/2 )TiO 3 [BNT] at x = 0.13–0.14, 0.08–0.09 and 0.06–0.07 in the case of b = 0, b = 0.5 and b = 1, respectively. BNPB ceramics are superior for piezoelectric ceramics in high‐frequency ultrasonic uses, or special piezoelectric actuator materials with a lower free permittivity ε 33 T ε 0 , and a high electromechanical coupling factor k 33 , along with a high mechanical strength.