Relaxor or classical ferroelectric behavior in ceramics with composition Sr2-xA1+xNb5O15-xFx (A = Na, K)
EL ALAOUI-BELGHITI, H.
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Laboratoire de Chimie du Solide Minéral
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Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Laboratoire de Chimie du Solide Minéral
EL ALAOUI-BELGHITI, H.
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Laboratoire de Chimie du Solide Minéral
< Réduire
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Laboratoire de Chimie du Solide Minéral
Langue
en
Article de revue
Ce document a été publié dans
Materials Letters. 2002, vol. 55, n° 3, p. 138-144
Elsevier
Résumé en anglais
By partial cationic and anionic substitutions in NaNbO3-SrNb2O6 and KNbO3-SrNb2O6 systems, two solid solutions have been obtained: Sr2−xNa1+xNb5O15−xFx and Sr2−xK1+xNb5O15−xFx. They crystallize in the tetragonal tungsten ...Lire la suite >
By partial cationic and anionic substitutions in NaNbO3-SrNb2O6 and KNbO3-SrNb2O6 systems, two solid solutions have been obtained: Sr2−xNa1+xNb5O15−xFx and Sr2−xK1+xNb5O15−xFx. They crystallize in the tetragonal tungsten bronze (TTB) type structure, which is related to that of the perovskite. The replacement of oxygen by fluorine causes a decrease of the Curie temperature. A weak F-O substitution rate increases the compactness, which leads to higher dielectric constant with good piezoelectric and pyroelectric characteristics. A relatively higher F-O substitution rate induces aferroelectricrelaxorbehavior. Such relaxorferroelectricceramics with lead-free compositions can be of great interest for environment-friendly applications.< Réduire
Mots clés en anglais
Disorder
Relaxor
TTB
Ceramics
Origine
Importé de halUnités de recherche