Preparation and characterization of yBiGaO/sub 3/-(1-x-y)BiScOs/sub 3-x/PbTiO/sub 3/ piezoelectric ceramics

The ternary system of j/BiGaO
₃
-(1-x-y) BiScO
₃
-xPbTiO
₃
(BGS-PT) ceramics was prepared by using conventional mixing oxide processing. X-ray diffraction analysis revealed that the BGS-PT ceramics showed the perovskite structure. The Curie temperature (T
_C
) of BGS-PT ceramics was found to increase with increasing BiGaO
₃
content. However, a larger BiGaO
₃
content led to sharply decreased piezoelectric properties, and the secondary phase was formed in the BGS-PT system. BGS-PT ceramics with x = 0.56, y = 0.19 showed a high Curie temperature T
_C
and a large piezoelectric constant d
₃₃
of 501degC and 152 pC/N, respectively. The high T
_C
of BGS-PT ceramics with usable piezoelectric properties suggests future high-temperature applications.