Kinetics of the initial stage in a first-order phase transformation in thin films |
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Authors: | V N Detsik S A Kukushkin A V Osipov E Yu Kaptelov I P Pronin |
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Institution: | (1) Institute of Problems in Mechanical Engineering, Russian Academy of Sciences, 199178 St. Petersburg, Russia;(2) A. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia |
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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.
Fiz. Tverd. Tela (St. Petersburg) 39, 121–126 (January 1997) |
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