Interatomic potential optimization to determine phase transitions in PbTiO3 based on phonon dispersion
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN(2023)
摘要
When exploring new ferroelectric materials computationally, it is necessary to consider the temperature depen-dence and physical properties of the structure. In the present study, we used a classical molecular dynamics simulation to investigate phase transitions during high-temperature annealing of KNbO3. The results revealed that a supercell larger than 8 & COPY; 8 & COPY; 8 is required to reproduce the phase transitions clearly. We also attempted to establish a method for obtaining the interatomic potential for any alloy composition. For PbTiO3, this was achieved using genetic algorithm fitting, and a phonon dispersion curve similar to that simulated by first-principles calculation was obtained.& COPY;2023 The Ceramic Society of Japan. All rights reserved.
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关键词
Ferroelectric, Piezoelectric, Molecular dynamics simulation, Interatomic potential, KNbO3, PbTiO3
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