A Strain-Driven Morphotropic Phase Boundary in BiFeO3

  title={A Strain-Driven Morphotropic Phase Boundary in BiFeO3},
  author={R. J. Zeches and Marta D. Rossell and J. X. Zhang and Alison J. Hatt and Q. He and C-H. Yang and A. K. Sarin Kumar and C. H. Wang and A. Melville and Carolina Adamo and Guang Sheng and Y. H. Chu and Jon F. Ihlefeld and Rolf Erni and Claude Ederer and Venkatraman Gopalan and L. Q. Chen and Darrell G. Schlom and Nicola A. Spaldin and L. W. Martin and Ramamoorthy Ramesh},
  pages={977 - 980}
Biffed into Shape BiFeO3 is known to have a very large ferroelectric polarization. Although the bulk ground state is rhombohedral (with the electrical polarization along the [111] direction), in thin films and under epitaxial strain, the material can be tetragonally distorted (polarization along [001]). Zeches et al. (p. 977) show that under compressive strain, these films are monoclinic, a phase that is highly stable because it comprises the same symmetry as the monoclinic phase which has been… 

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