Dielectric and piezoelectric enhancements in the BiFeO3-PbTiO3 solid solutions with Gd doping

Gadolinium doped BiFeO
₃
-PbTiO
₃
((Bi
_1-x
Gd
_x
)FeO
₃
-PbTiO
₃
, BGF-PT) crystalline solution ceramics for x=0, 0.1, 0.2 and 0.3 are studied in this report. X-ray diffraction (XRD) result reveals that all ceramics are in single perovskite structure. Phase transition from rhombohedral to tetragonal is observed at x=0.1. Enhanced dielectric properties with k=863 and tandelta=0.023 at the frequency of 10
²
Hz are obtained in BGF-PT of x=0.2. The Curie temperature of BGF-PT for x=0.2 is achieved to 430degC, which is much higher than La doped BiFeO
₃
-PbTiO
₃
. Significant piezoelectric enhancements is also found in the BGF-PT ceramics. Our results indicate that BGF-PT is a competitive high temperature piezoelectric material.