Title :
Piezoelectric properties of modified (K0.5Na0.5)NbO3-BaTiO3 ceramics with the mixture sintering aids of 0.6B2O3-0.4CuO
Author :
Adachi, Masatoshi ; Yan, Kang ; Matsumoto, Kohei ; Karaki, Tomoaki
Author_Institution :
Dept. of Intell. Syst. Design Eng., Toyama Prefectural Univ., Imizu, Japan
Abstract :
A combined sintering aid mixture of B2O3 and CuO for lead-free piezoelectric ceramics 0.95K0.5Na0.5NbO3-0.05BaTiO3 (KNN-BT) is introduced. The effects of the mixture sintering aids of 0.6B2O3-0.4CuO on the sintering behavior, microstructure, and electrical properties for KNN-BT are investigated. Adding 2wt% of sintering aids can effectively broaden the narrow range of sintering temperature from 20°C to above 50°C and enlarge the grain of samples as well as hold the high density of sample sintered at low temperature. The increase of gain size contributed to the improvement in electrical properties. High piezoelectric properties with d33=205pC/N, kp=38.0%, ε33T/ε0=1254, and tanδ=0.026 are obtained for sample of KNN-BT-ywt%(B2O3-CuO) with y=2 sintered at 1120°C.
Keywords :
barium compounds; grain size; mixtures; permittivity; piezoceramics; potassium compounds; sintering; sodium compounds; B2O3-CuO; K0.5Na0.5NbO3-BaTiO3; grain size; lead-free piezoelectric ceramics; microstructure; sintering; temperature 1120 degC; temperature 20 degC to 50 degC; Ceramics; Dielectric losses; Lead; Microstructure; Temperature; Temperature measurement; CuO-B2O3; KNN-BT; Sintering Aid; component; lead-free;
Conference_Titel :
Applications of Ferroelectrics (ISAF), 2010 IEEE International Symposium on the
Conference_Location :
Edinburgh
Print_ISBN :
978-1-4244-8190-3
Electronic_ISBN :
1099-4734
DOI :
10.1109/ISAF.2010.5712219
