Abstract
The nucleation and growth of islands of a new phase on the surface of solids has been studied both experimentally and theoretically for the particular case of the transition from the pyrochlore to perovskite phase in a thin film of a lead zirconate-titanate ferroelectric. This transformation was chosen because the new-phase islands have a stable circular shape in this case, a relatively large size (10−5–10−4 m) permitting their observation with an optical microscope, and a low growth rate (10−8–10−9 m/s). A theoretical analysis of the process, based on the kinetic theory of first-order phase transitions proposed earlier, has been carried out and the behavior in time of all main characteristics of a phase transformation, namely, nucleation rate, concentration of the new-phase islands, their size distribution, and relative overheating, has been calculated. The same characteristics have been measured experimentally, thus permitting one for the first time to make a thorough comparison of the theoretical with experimental data on the kinetics of first-order phase transitions. They have been found to be in a good agreement.
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Fiz. Tverd. Tela (St. Petersburg) 39, 121–126 (January 1997)
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Detsik, V.N., Kukushkin, S.A., Osipov, A.V. et al. Kinetics of the initial stage in a first-order phase transformation in thin films. Phys. Solid State 39, 104–108 (1997). https://doi.org/10.1134/1.1129809
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DOI: https://doi.org/10.1134/1.1129809