Effect of simultaneous Cu and Nb doping Bi4V2O11 on structural and electrical properties of Bi4V2−xCux/2Nbx/2O11−3x/4
TURINO, Andrea
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Department of Chemical Sciences
< Réduire
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Department of Chemical Sciences
Langue
en
Article de revue
Ce document a été publié dans
Journal of Solid State Chemistry. 2023, vol. 320, p. 123878 (7 p.)
Elsevier
Résumé en anglais
BiMeVOx compounds Bi4V2-xCux/2Nbx/2O11-3x/4 doubly substituted solid solution, with identical compositions of Cu2+ and Nb5+ ions, show an area of existence from x = 0 to 0.5. X-ray diffraction measurements and thermal ...Lire la suite >
BiMeVOx compounds Bi4V2-xCux/2Nbx/2O11-3x/4 doubly substituted solid solution, with identical compositions of Cu2+ and Nb5+ ions, show an area of existence from x = 0 to 0.5. X-ray diffraction measurements and thermal analysis have shown that, depending on the composition, the three main Bi4V2O11 polymorphs α, β and (γ/γ′) are observed at room temperature. The evolution of the electrical conductivity with the rate of substitution has been investigated by electrochemical impedance spectroscopy (EIS) in the temperature range 120–720 °C. The highest values of conductivity are observed for samples with x = 0.2. Scanning electron microscopy (SEM) shows an important grain growth and the presence of micro-cracks in the ceramics with x = 0.5 composition.< Réduire
Mots clés en anglais
Aurivillius phases
Bi4V2O11
BIMEVOX materials
Ionic conductivity
Origine
Importé de halUnités de recherche