Phase Transition and Large Electrostrain in Lead‐Free Li‐Doped (Ba, Ca)(Ti, Zr)O3 Ceramics

Abstract

Large piezoelectric effect is achieved in Li‐doped Ba0.85Ca0.15Ti0.90Zr0.10O3(BCTZ) ceramics by use of tuning the phase boundaries. Rhombohedral–orthorhombic (R–O) and orthorhombic–tetragonal (O–T) multiphase coexistence is constructed in the ceramics by changing Li contents. The high piezoelectric constant d33 (493 pC/N) and large electrostrain (dSmax/dEmax = 931 pm/V) have been observed in the Li‐doped (Ba, Ca)(Ti, Zr)O3 ceramics at low sintering temperature (1350°C/2 h). The significant enhancement in materials properties is ascribed to the multiphase region around room temperature induced by Li‐doped effect.