| Autor: |
Arnold, Donna C., Knight, Kevin S., Morrison, Finlay D., Lightfoot, Philip |
| Rok vydání: |
2008 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. Lett., 102, 027602, 2009 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevLett.102.027602 |
| Popis: |
A detailed investigation using variable temperature powder neutron diffraction demonstrates that BiFeO3 undergoes a phase transition from the ferroelectric alpha phase (rhombohedral, R3c) to a paraelectric beta phase (orthorhombic, Pbnm) between 820 oC and 830 oC. Co-existence of both phases over a finite temperature interval, together with abrupt changes in key structural parameters, confirm that the transition is firstorder. The beta phase corresponds to the GdFeO3-type perovskite. The metastability of BiFeO3 relative to Bi2Fe4O9 above 810 oC precludes observation of a reported cubic gamma phase above 925 oC under the present experimental conditions. |
| Databáze: |
arXiv |
| Externí odkaz: |
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