Abstract
A direct evaluation of elastic properties and refractive indices of sol–gel derived calcium modified lead titanate films has been made by means of Brillouin spectroscopy using a new experimental configuration. Amorphous films deposited on platinized substrates were treated at temperatures between 350 and 650 °C, using rapid thermal annealing. A variation of the sound velocity in the films with the annealing temperature was measured. A clear decrease at 375 °C and a continuous softening of the sound velocity up to 475 °C were observed. The latter is followed by a jump toward higher values of the sound velocity when the samples are treated at higher temperatures. Grazing incidence x-ray diffraction and profilemetry have been used to monitor structural changes and variation of film thickness with temperature, inferring relations among these parameters and properties obtained from the Brillouin measurements.
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