Title :
Composition Dependent Piezoelectric Properties of Pb-free (Bi0.o5N0o 5)1-x) BaxTiO3 Ceramics
Author :
Sung, Y.S. ; Cho, J.H. ; Song, T.K. ; Jeong, S.J. ; Song, J.S. ; Kim, M.H.
Author_Institution :
Changwon Nat. Univ., Changwon
Abstract :
An optimum composition for maximizing piezoelectric properties of (Bi0.5Na0.5)(1-x)BaxTiO3 ceramics was investigated within the range of x=0-0.1 covering rhombohedral to tetragonal phase regions of the system. A perovskite structure with two different crystal symmetries depending on the Ba content was formed with no impurity phases. A range of morphotropic phase boundary dividing rhombohedral and tetragonal phase regions was found to exist at x=0.05~0.08. As for piezoelectric properties the piezoelectric constant (d33) and the electromechanical coupling factor (Kp) showed a peak value at x=0.065 within the range tested, which was 192 pC/N and 34%, respectively, implying x=0.065 as an optimum composition for piezoelectric (Bi0.5Na0.5)(1-x)BaxTiO3 ceramics.
Keywords :
barium compounds; bismuth compounds; crystal symmetry; electromechanical effects; ferroelectric transitions; piezoceramics; piezoelectricity; sodium compounds; Bi0.5Na0.5BaTiO3; crystal symmetries; electromechanical coupling factor; ferroelectric ceramics; morphotropic phase boundary; perovskite structure; piezoelectric constant; piezoelectric properties; Biological materials; Bismuth; Ceramics; Composite materials; Ferroelectric materials; Magnetic materials; Magnetic properties; Piezoelectric devices; Piezoelectric materials; Powders;
Conference_Titel :
Applications of Ferroelectrics, 2007. ISAF 2007. Sixteenth IEEE International Symposium on
Conference_Location :
Nara
Print_ISBN :
978-1-4244-1334-8
Electronic_ISBN :
1099-4734
DOI :
10.1109/ISAF.2007.4393373
