Abstract
The dipole configuration and electromechanical behaviors of dipole-disorder induced relaxor ferroelectrics (RFs) are investigated using a phenomenological model. In comparison to normal ferroelectric lattice, the RF lattice shows spatially inhomogeneous cluster configuration but no breaking of the dipole orientation symmetry is identified. A clean relationship between the piezoelectric response and the characteristic size of the ferroelectric clusters is established, which predicts a broad peak of the piezoelectric coefficient in response to the dipole disorder degree.
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