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A phenomenological theory has been proposed for the diffusionless structuralphase transitions in crystalline solids here. It has been found that for BaTiO3single crystal, both the phase transitions and the crystal structures can bepredicted with the crystalline anisotropy constants and order parameterdependent strain constants that depend on the temperature. The results havealso shown that the morphotropic phase boundaries in PZT crystals arise fromthe crystalline anisotropy.

A Theory for Diffusionless Structural Phase Transitions in BaTiO3 and PZT Single Crystals