In situ electric field induced domain evolution in Ba(Zr_(0.2)Ti_(0.8))O_3-0.3(Ba_(0.7)Ca_(0.3))TiO_3 ferroelectrics

摘要

In this work, the lead-free Ba(Zr_(0.2)Ti_(0.8))O_3-0.3(Ba_(0.7)Ca_(0.3))TiO_3 piezoelectric ceramic was investigated in situ under an applied electric field by transmission electron microscopy. Significant changes in domain morphology of the studied material have been observed under an applied electric field. During the poling process, the domain configurations disappeared, forming a single-domain state. This multi- to single-domain state transition occurred with the formation of an intermediate nanodomain state. After removing the electric field, domain configurations reappeared. Selected area electron diffraction during electrical poling gave no indication of any structural changes as for example reflection splitting. Rather, a contribution of the extrinsic effect to the piezoelectric response of the Ba(Zr_(0.2)Ti_(0.8))O_3-0.3(Ba_(0.7)Ca_(0.3))TiO_3 was found to be dominant.