Domain structure peculiarities of lead-titanate crystals

Observation methods, localization sites, configuration of reciprocal domains and their formation in PbTiO3 crystals are described. These domains appear at the ferroelectric phase transition. The reciprocal domain concentration in a crystal depends on the velocity of the phase front travel and becomes minimum at velocities of the order of 0.1 mm/ min. A suggestion is advanced about the role of such domains in the spontaneous polarization screening mechanism.