Abstract
Results on a variety of compositionally-disordered ABO 3 perovskites have revealed a pressure-induced crossover from a normal ferroelectric to a relaxor state and the continuous evolution of the dynamics of the relaxation process making the relaxor state the ground state at high pressure. This crossover is a general feature of soft mode ferroelectrics with random site dipolar impurities, or polar nanodomains, and results from a large decrease with pressure in the correlation length among polar nanodomains--a unique property of soft mode, or highly polarizable, ferroelectrics. The physical mechanism for the crossover and some relevant theoretical models are discussed. An analogy between increasing pressure and increasing chemical substitution at 1 bar for inducing the crossover is pointed out, but it is the pressure results that reveal the essential physics.
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