Influence of pressure on the kinetics of ferroelectric phase transition in BaTiO3

The ferroelectric phase transition in barium titanate under pressure was studied within the framework of Landau - Ginzburg theory using differential scanning calorimetry. An innovative method for high-sensitive thermal measurements under pressure was demonstrated. It was shown that the relaxation process proceeds nonmonotonically with the formation of intermediate short-lived phases. It was established that polydomain ordering is preferred but the monodomenization of the sample is possible under certain conditions. A narrowing of the temperature hysteresis with increasing pressure was revealed. A new tricritical point in barium titanate crystals characterizing the changing of the phase transition has been experimentally determined and theoretically confirmed. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

In this study, the ferroelectric phase transition in barium titanate was investigated under pressure using differential scanning calorimetry and the Landau-Ginzburg theory. The experimental results demonstrated the presence of intermediate short-lived phases during the transition process, indicating a nonmonotonic relaxation process. It was also observed that under certain conditions, the sample could undergo monodomenization despite the preference for polydomain ordering. Furthermore, increasing pressure led to a narrowing of the temperature hysteresis, and a new tricritical point characterizing the phase transition change was identified experimentally and theoretically confirmed.