Abstract
It has been found that the surface layer of lead titanate (PT) thin film has different c/a ratio from that of the bulk layer of the film, surface layer has lower phase transition temperature than that of the whole film. In order to clarify the phase transition properties of the films, a phenomenological model was presented to analyze the influences of the crystallite size and stresses on the phase transition properties of the films. The structure and the phase transition differences between the surface and bulk layer were attributed to the in-homogeneously distributed crystallite size and stress in the film
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