Abstract
The structural phase transitions and the ferroelastic domain structure in the Orthorhombic Room Temperature (ORT) phase of the layer perovskite bis-(alkylammonium)-tetrachlorometallates was studied by hotstage polarizing photomicrography. The effects of the rate of cooling through the Tetragonal High Temperature (THT) → ORT structural phase transition and of a long annealing period in the THT phase upon the ORT phase domain structure were examined. The behaviour of the crystals as transmission optical diffraction gratings was also investigated. The domain structure of newly grown crystals is determined by their mechanical history. The density of domain walls is independent of the cooling rate through the phase transition and is only changed by long periods of annealing in the THT phase.
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