Title :
Piezoelectric properties of PNW-PMN-PZT ceramics for high power piezoelectric transformer
Author :
Yoo, J.-H. ; Lee, Y.-W. ; Hwang, S.M. ; Yoon, H.S. ; Jeong, H.S. ; Kim, J.S. ; Yoo, C.-S.
Author_Institution :
Dept. of Electr. Eng., Semyung Univ., Chungbuk, South Korea
Abstract :
Piezoelectric properties of Pb1-aSra(Ni1/2W1/2)0.02 (Mn1/3Nb2/3)b(Krx, Ti y)1-0.02-bO3 ceramics added to 0.5 wt% PbO, 0.3 wt%Fe2O3 and 0.25 wt% CeO2 were investigated with the variations of a=0-0.06, b=0.05-0.07, x=0.49-0.51, and y=0.49-0.51. Mechanical quality factor, coercive field and Curie temperature with the decrease of Zr/Ti ratio were increased by the increase of tetragonality. According to the increase of PMN mol%, grain size decreased and coercive field increased. Moreover, dielectric constant and mechanical quality factor increased and Curie temperature and coercive field decreased with the increase of the substitution of Sr mol% to Pb sites. Taking into consideration the dielectric constant of 1,680, mechanical quality factor of 1,814, and temperature stability of resonant frequency of TCfr 88 at a=0.06, b=0.07, x=0.51, and y=0.49 composition ceramics, it can be concluded that this composition is the best one for piezoelectric transformer
Keywords :
Q-factor; ferroelectric Curie temperature; grain size; permittivity; piezoceramics; piezoelectric devices; power transformers; PbSr(NiW)TiO3-PMN-PZT; PbSrNiWTiO3-PbMgO3NbO3-PbZrO3TiO3; coercive field; curie temperature; dielectric constant; high power piezoelectric transformer; mechanical quality factor; piezoelectric ceramics; piezoelectric properties; temperature stability of resonant frequency; tetragonality; Ceramics; Dielectric constant; Grain size; Niobium; Q factor; Resonant frequency; Stability; Strontium; Temperature; Zirconium;
Conference_Titel :
Applications of Ferroelectrics, 2000. ISAF 2000. Proceedings of the 2000 12th IEEE International Symposium on
Conference_Location :
Honolulu, HI
Print_ISBN :
0-7803-5940-2
DOI :
10.1109/ISAF.2000.941605
