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Structural evolution and physical properties of Bi1−xGdxFeO3 ceramics / J.B. Li in Acta materialia, Vol. 58 N° 10 (Juin 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3701–3708 Titre : Structural evolution and physical properties of Bi1−xGdxFeO3 ceramics Type de document : texte imprimé Auteurs : J.B. Li, Auteur ; G.H. Rao, Auteur ; Xiao, Y., Auteur Année de publication : 2011 Article en page(s) : pp. 3701–3708 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Bi-based  magnetoelectric  perovskites  Crystal  structure  Phase  transformation  X-ray  diffraction Résumé : The crystal structure and physical properties of Bi1−xGdxFeO3 ceramics with x ≤ 0.5 have been studied by X-ray diffraction, differential scanning calorimetry, dielectric and magnetic measurements. Bi1−xGdxFeO3 compounds crystallize at room temperature in R3c structure for x < 0.08 and in Pbnm structure for x ≥ 0.3. The R3c phase transforms to the Pbnm phase as temperature increases. Temperature-dependent dielectric response and low-temperature X-ray diffraction indicate a phase transition of the Pbnm phase at low-temperature. Detailed structural analysis indicates that the interaction between Bi and O plays an important role in the evolution of structure and physical properties. A phase diagram is constructed to illustrate the physical property–composition–temperature relations. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001527 [article] Structural evolution and physical properties of Bi1−xGdxFeO3 ceramics [texte imprimé] / J.B. Li, Auteur ; G.H. Rao, Auteur ; Xiao, Y., Auteur . - 2011 . - pp. 3701–3708. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3701–3708 Mots-clés : Bi-based  magnetoelectric  perovskites  Crystal  structure  Phase  transformation  X-ray  diffraction Résumé : The crystal structure and physical properties of Bi1−xGdxFeO3 ceramics with x ≤ 0.5 have been studied by X-ray diffraction, differential scanning calorimetry, dielectric and magnetic measurements. Bi1−xGdxFeO3 compounds crystallize at room temperature in R3c structure for x < 0.08 and in Pbnm structure for x ≥ 0.3. The R3c phase transforms to the Pbnm phase as temperature increases. Temperature-dependent dielectric response and low-temperature X-ray diffraction indicate a phase transition of the Pbnm phase at low-temperature. Detailed structural analysis indicates that the interaction between Bi and O plays an important role in the evolution of structure and physical properties. A phase diagram is constructed to illustrate the physical property–composition–temperature relations. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001527