Title :
Lead-free piezoelectric ceramic in the system of Bi12/Na12/TiO3-Bi12/K12/TiO3-BaTiO3 (BiNT-BiKT-BT)
Author :
Hahg, N.M. ; Allahverdi, M. ; Safari, A.
Author_Institution :
Dept. of Ceramic & Mater. Eng., Rutgers Univ., Piscataway, NJ, USA
Abstract :
Electromechanical properties of MPB composition (Bi0.486Na0.426K0.12Ba0.028TiO3) in the system of BiNT-BiKT-BT have been investigated. The conventional processing method has been used to prepare the samples. Dielectric behavior of the MPB composition indicates a phase transition at about 150°C. High temperature polarization measurements also confirmed the phase transition, which represents antiferroelectric behavior at 160°C. A relatively high d33 of 183±5 pC/N, a tanδ of 2.1%, a dielectric constant of 750, a Curie temperature of 295δC with thickness and planar coupling coefficients of 55%, and 35% have been obtained. High piezoelectric coefficient with higher thickness coupling coefficients makes this composition, a promising candidate as a lead-free piezoelectric ceramics.
Keywords :
barium compounds; bismuth compounds; dielectric polarisation; ferroelectric Curie temperature; ferroelectric transitions; permittivity; piezoceramics; piezoelectricity; potassium compounds; sodium compounds; 295 degC; Bi0.486Na0.426K0.12Ba0.028TiO3; Curie temperature; MPB composition; antiferroelectric behavior; dielectric behavior; dielectric constant; electromechanical properties; high temperature polarization measurements; lead-free piezoelectric ceramic; phase transition; piezoelectric coefficient; planar coupling coefficients; thickness coupling coefficients; Bismuth; Ceramics; Dielectric constant; Dielectric measurements; Environmentally friendly manufacturing techniques; Piezoelectric materials; Piezoelectric polarization; Solids; Temperature measurement; Titanium compounds;
Conference_Titel :
Applications of Ferroelectrics, 2004. ISAF-04. 2004 14th IEEE International Symposium on
Print_ISBN :
0-7803-8410-5
DOI :
10.1109/ISAF.2004.1418382
