Linear and nonlinear dielectric response in disordered and uniaxial relaxor ferroelectrics

Abstract

The first, ε1 and third harmonic dielectric response ε3 have been simultaneously measured in disordered perovskite relaxors PMN single crystal and 9/65/35 PLZT ceramics, uniaxial relaxor ferroelectric SBN:Ce single crystal, and ferroelectric single crystal TGS. The temperature dependences of the static dielectric constant and dielectric nonlinearity a 3 = ε3/ε1 4 show that in zero electric field disordered perovskite relaxors undergo a freezing transition into nonergodic glassy phase, while in uniaxial relaxors spontaneous breaking of relaxor freezing into the ferroelectric state occurs.