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
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Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Department of Chemical Sciences
Language
en
Article de revue
This item was published in
Journal of Solid State Chemistry. 2023, vol. 320, p. 123878 (7 p.)
Elsevier
English Abstract
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 ...Read more >
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.Read less <
English Keywords
Aurivillius phases
Bi4V2O11
BIMEVOX materials
Ionic conductivity
Origin
Hal imported