Glassy properties of 9/65/35 PLZT ceramics

Abstract

The freezing process in 9/65/35 PLZT ceramics has been investigated by measurements of the quasistatic field cooled and zero-field cooled dielectric susceptibilities and of the frequency dependent complex dielectric constant. The temperature dependence of the third harmonic dielectric nonlinearity a₃ = ε₃/ε₁ ⁴ has been determined in 9/65/35 PLZT ceramics. In zero electric field a deep in the temperature dependence of the static a₃ indicates a crossover from paraelectric-like to glass-like behavior. The temperature dependence of the linear and nonlinear static dielectric response can be described with the modified spherical random-bond-random-field model of relaxor ferroelectrics.

Key Words:

• PLZT
• Relaxor
• Dielectric
• glass transition.