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Effect of space charge on the polarization hysteresis characteristics of monolithic and compositionally graded ferroelectrics / M.B. Okatan in Acta materialia, Vol. 58 N° 1 (Janvier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 39–48 Titre : Effect of space charge on the polarization hysteresis characteristics of monolithic and compositionally graded ferroelectrics Type de document : texte imprimé Auteurs : M.B. Okatan, Auteur ; J.V. Mantese, Auteur ; S. P. Alpay, Auteur Année de publication : 2010 Article en page(s) : pp. 39–48 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Dielectrics  Multilayers  Perovskites  Ferroelectricity  Interface  defects Résumé : A non-linear thermodynamic analysis of ferroelectric systems with localized space charges for monolithic and compositionally graded materials is described wherein the electrostatic interlayer interactions are specifically accounted for. The electrostatic coupling is established through the built-in polarization due to the space charges and the intrinsic polarization variations between the ferroelectric layers. The findings show that the polarization hysteresis response of monolithic stress-free barium strontium titanate (BST) ferroelectrics with asymmetrically distributed space charges result in a displacement of the hysteresis loop along the applied electric field axis. In compositionally graded BST multilayers, the hysteresis response is characterized by off-sets along both the polarization and the electric field axes, yet with magnitudes of displacement that are markedly larger than those for monolithic ferroelectrics. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409005679 [article] Effect of space charge on the polarization hysteresis characteristics of monolithic and compositionally graded ferroelectrics [texte imprimé] / M.B. Okatan, Auteur ; J.V. Mantese, Auteur ; S. P. Alpay, Auteur . - 2010 . - pp. 39–48. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 39–48 Mots-clés : Dielectrics  Multilayers  Perovskites  Ferroelectricity  Interface  defects Résumé : A non-linear thermodynamic analysis of ferroelectric systems with localized space charges for monolithic and compositionally graded materials is described wherein the electrostatic interlayer interactions are specifically accounted for. The electrostatic coupling is established through the built-in polarization due to the space charges and the intrinsic polarization variations between the ferroelectric layers. The findings show that the polarization hysteresis response of monolithic stress-free barium strontium titanate (BST) ferroelectrics with asymmetrically distributed space charges result in a displacement of the hysteresis loop along the applied electric field axis. In compositionally graded BST multilayers, the hysteresis response is characterized by off-sets along both the polarization and the electric field axes, yet with magnitudes of displacement that are markedly larger than those for monolithic ferroelectrics. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409005679