The field of smart materials research has grown dramatically during the last several years (see, for example, [1]) and emerged from the complex interactions of a number of different technical disciplines. The fields involved include materials design, sensing, actuation, artificial intelligence, adaptive control, complex adaptive systems, and others. Smart materials are multifunctional materials exploited in different fields of science and engineering. They feature a combination of sensors, actuators, and processors. Some of the perovskite ABO3 materials have recently attracted attention as very firm ceramics, as substances having very large electro-optic coefficients, and as materials applied in the development of integrated micromechanical transistor, memory, and optical devices [2-4]. Many properties of perovskites, such as dielectric constant, ageing, piezoelectric and electro-optic coefficients, are related to grain, interphase boundaries, domain structure and walls [5, 6]. The properties of ferroelectric ceramics may be affected by the nature of ferroelectric and ferroelastic domain boundaries, which appear as mechanical and/or transformation twins in these systems. The effect of composition, pressure and external fields in bulk perovskites has already been studied in many laboratories [5, 7-15]. However, the majority of the research has been carried out to study the static properties of ferro-electrics. At the same time, the sensitivity of the perovskite-based devices depends crucially on the kinetics of the phase transformations in these substances.
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