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Keywords:

  • BiFeO3;
  • multiferroics;
  • ferroelectric thin films;
  • piezoelectric switching;
  • phase transitions
Thumbnail image of graphical abstract

Highly strained BiFeO3 films transition into a true tetragonal state at 430 °C but remain polar to much higher temperatures (∼800 °C). Piezoelectric switching is only possible up to 300 °C, i.e., at temperatures for which strain stabilizes the stripe-like coexistence of multiple polymorphs.