Title :
Piezoelectric and optical properties of La-modified Pb(Sc1/2 Nb1/2)O3-PbTiO3 binary ceramics near the morphotropic phase boundaries
Author :
Adachi, Masatoshi ; Maruyama, Kazunari ; Karaki, Tomoaki ; Kawabata, Akio
Author_Institution :
Dept. of Electron. & Inf. Eng., Toyama Univ., Japan
Abstract :
Physical, electrical and optical properties of La-modified Pb(Sc 1/2Nb1/2)O3-PbTiO3 (La-modified PSNT) binary ceramics near the morphotropic phase boundaries (MPB), prepared by the hot pressing (HP) method was investigated. The MPB follows on a linear line from the composition of La-modified PSN/PT 0/57.5/42.5 to 12.2/60.9/39.1 above RT. The Curie temperature of this system decreases from 250 to 25°C with increasing La content. By using the HP system and annealing after HP processing for 30 h under excess PbO of 10mol%, the number of pores in the ceramics decreased as 0.34% and mean grain size was also enhanced as to be around 4 μm. Curie temperature of La modified PSNT 5.88/58.9/41.1 was 130°C, and its dielectric constant, coupling factor k31 and optical transmittance (at 633nm) at RT were 6000, 0.48 and 40%, respectively
Keywords :
annealing; ferroelectric Curie temperature; grain size; hot pressing; lanthanum compounds; lead compounds; permittivity; piezoceramics; visible spectra; Curie temperature; La content; PbLaScO3NbO3-PbLaTiO3; ceramics; coupling factor; dielectric constant; grain size; hot pressing; morphotropic phase boundaries; optical transmittance; piezoelectric properties; Annealing; Ceramics; Dielectric constant; Dielectric loss measurement; Dielectric measurements; Ferroelectric materials; Lead; Niobium; Raw materials; Temperature;
Conference_Titel :
Applications of Ferroelectrics, 1998. ISAF 98. Proceedings of the Eleventh IEEE International Symposium on
Conference_Location :
Montreux
Print_ISBN :
0-7803-4959-8
DOI :
10.1109/ISAF.1998.786705
