Changes in structure and electrical ...
Type de document :
Article dans une revue scientifique
URL permanente :
Titre :
Changes in structure and electrical conductivity of rare-earth titanate pyrochlores under highly reducing atmosphere
Auteur(s) :
Cioatera, N. [Auteur]
Voinea, E.A. [Auteur]
Panaintescu, E. [Auteur]
Rolle, Aurelie [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Somacescu, S. [Auteur]
Spinu, C.I. [Auteur]
Vannier, Rose-Noelle [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Voinea, E.A. [Auteur]
Panaintescu, E. [Auteur]
Rolle, Aurelie [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Somacescu, S. [Auteur]
Spinu, C.I. [Auteur]
Vannier, Rose-Noelle [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Titre de la revue :
Ceramics International
Numéro :
42
Pagination :
1492-1500
Date de publication :
2016-01
Discipline(s) HAL :
Chimie/Chimie inorganique
Résumé en anglais : [en]
M2Ti2O7 (M=Y, Gd, Sm) pyrochlore materials are synthesized by a Pechini method. The pyrochlore phase evolution with temperature under air and under highly reducing conditions (2% H2 in Ar) is investigated using high-temperature ...
Lire la suite >M2Ti2O7 (M=Y, Gd, Sm) pyrochlore materials are synthesized by a Pechini method. The pyrochlore phase evolution with temperature under air and under highly reducing conditions (2% H2 in Ar) is investigated using high-temperature X-ray diffraction. The decomposition of pyrochlore oxides into their component single oxides is evidenced when they are exposed to a hydrogen atmosphere. Sm2Ti2O7 pyrochlore is the most stable compound, while Gd2Ti2O7 undergoes a strong reduction even at RT. The bulk electrical conductivity of the samples is evaluated by electrochemical impedance spectroscopy. The greatest increase in conductivity is evidenced for Gd2Ti2O7, while Sm2Ti2O7 is the most stable among the investigated compounds. Besides oxygen ions and electrons, the contribution of hydrogen defects to the bulk conductivity must be considered in such reducing atmosphere.Lire moins >
Lire la suite >M2Ti2O7 (M=Y, Gd, Sm) pyrochlore materials are synthesized by a Pechini method. The pyrochlore phase evolution with temperature under air and under highly reducing conditions (2% H2 in Ar) is investigated using high-temperature X-ray diffraction. The decomposition of pyrochlore oxides into their component single oxides is evidenced when they are exposed to a hydrogen atmosphere. Sm2Ti2O7 pyrochlore is the most stable compound, while Gd2Ti2O7 undergoes a strong reduction even at RT. The bulk electrical conductivity of the samples is evaluated by electrochemical impedance spectroscopy. The greatest increase in conductivity is evidenced for Gd2Ti2O7, while Sm2Ti2O7 is the most stable among the investigated compounds. Besides oxygen ions and electrons, the contribution of hydrogen defects to the bulk conductivity must be considered in such reducing atmosphere.Lire moins >
Langue :
Anglais
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
ENSCL
CNRS
Centrale Lille
Univ. Artois
Université de Lille
CNRS
Centrale Lille
Univ. Artois
Université de Lille
Collections :
Équipe(s) de recherche :
Matériaux inorganiques, structures, systèmes et propriétés (MISSP)
Matériaux oxydes pour énergie
Matériaux oxydes pour énergie
Date de dépôt :
2019-09-24T14:35:17Z