Structural evolution and magnetization enhancement of Bi1−xTbxFeO3

► Tb subsitutes at the Bi site in BiFeO3-Bi1−xTbxFeO3 (x=0-0.2) powders. ► Ferroelectric-paraelectric phase transition occurs at x=0.10-0.125. ► The highest remnant magnetization is at the phase boundary. ► The destruction of spin cycloid structure leads to the magnetization enhancement.