Large Piezoelectric Coefficient in Tb-Doped BiFeO3 Films

Polycrystalline BiFeO3 and Bi1-xTbxFeO3 (BTFO) (x=0.05-0.16) thin films were deposited on indium tin oxide/glass substrates via a metal organic deposition method. The influence of Tb doping content on the structure and multiferroic properties was investigated. X-ray diffraction results reveal that there may exist a structure transition around x=0.11 in the BTFO system. Well-saturated and rectangular P-E hysteresis loops can be observed in all BTFO films. The BTFOx=0.11 film exhibits the maximum values of the remanent out-of-plane piezoelectric coefficient (d(33)=140 pm/V) and saturated magnetization (M-s=22.2 emu/cm3).