Phase Transitions in Relaxor Ferroelectrics

This paper covers the properties of relaxor ferroelectrics and considers the transition from the paraelectric state to the relaxor state comparing experimental data with the spherical random-bond randomfield model (SRBRF). It found that this model predicts and is experimental verifies a glassy state at the transition temperature for E < Ec and a ferroelectric state with quench random fields for E > Ec. In addition, a critical phase transition in the tungsten bronze family of relaxor ferroelectrics and a crossover from random field Ising model behave to 3d Ising model behavior.