Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2007

High-pressure dependent ferroelectric phase transition in lead titanate

Résumé

Ti K edge x-ray absorption near-edge structure (XANES) measurements across the pressure induced ferroelectric-paraelectric phase transition in PbTiO3, a prototypical ferroelectric perovskite, are reported. A quantitative analysis of the XANES allows us to obtain the relative local displacement, directly related to the local electric polarization, of Ti and Pb atoms under pressure. In particular, we found that above the critical pressure, in the so-called cubic-paraelectric phase, the Ti atoms remain locally displaced from their cubic site, indicating that this phase transition has, in a general way, an essential order-disorder component. However, the magnitude of these local displacements is strongly affected by the applied pressure as opposed to what happens as a function of temperature. These conclusions have important consequences in the long standing controversial debate on the interpretation of the ferroelectric phase transition of PbTiO3 and related family compounds.

Fichier principal
Vignette du fichier
preprint_PbTiO3.pdf (669.32 Ko) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)
Licence
Loading...

Dates et versions

hal-00179001 , version 1 (15-11-2007)

Licence

Identifiants

Citer

Nicolas Jaouen, A.C. Dhaussy, Jean Paul Itié, Sylvain Marinel, Yves Joly. High-pressure dependent ferroelectric phase transition in lead titanate. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2007, 75, pp.224115. ⟨10.1103/PhysRevB.75.224115⟩. ⟨hal-00179001⟩
395 Consultations
525 Téléchargements

Altmetric

Partager

  • More