Title :
Lead-Free Piezoelectric Ceramics vs. PZT?
Author :
Zhang, Shujun ; Xia, Ru ; Shrout, Thomas R.
Author_Institution :
Pennsylvania State Univ., University Park
fDate :
July 30 2006-Aug. 3 2006
Abstract :
Investigations in the development of lead-free piezoelectric ceramics have recently claimed properties comparable to that of PZT-based materials. In this work, the dielectric and piezoelectric properties of the various systems were contrasted in relation to their respective Curie temperatures. Though comparable with respect to TC, enhanced properties reported in the K,NaNbO3 family are the result of increased polarizability associated with the Torthor-tetragonal polymorphic phase transition being compositionally shifted downward and not from a morphotropic phase boundary (MPB) as widely reported. As expected, the properties are strongly temperature dependent unlike that observed for MPB systems. Analogous to PZT, enhanced properties are noted for MPB compositions in the Na,BiTiO3-BaTiO3 and the ternary system with K,BiTiO3, but offer properties significantly lower than that of PZTs. The consequence of a ferroelectric to antiferroelectric transition well below TC further limits their usefulness.
Keywords :
Curie temperature; piezoceramics; piezoelectric transducers; Curie temperatures; PZT-based materials; antiferroelectric transition; dielectric piezoelectric properties; lead-free piezoelectric ceramics; morphotropic phase boundary; polymorphic phase transition; Ceramics; Dielectric losses; Dielectric materials; Environmentally friendly manufacturing techniques; Ferroelectric materials; Piezoelectric actuators; Piezoelectric materials; Piezoelectric polarization; Temperature dependence; Ultrasonic transducers; Lead-free Ceramic; PZT; Piezoelectric;
Conference_Titel :
Applications of ferroelectrics, 2006. isaf '06. 15th ieee international symposium on the
Conference_Location :
Sunset Beach, NC
Print_ISBN :
978-1-4244-1331-7
Electronic_ISBN :
1099-4734
DOI :
10.1109/ISAF.2006.4387860