Effect of simultaneous Cu and Nb doping Bi4V2O11 on structural and electrical properties of Bi4V2−xCux/2Nbx/2O11−3x/4 - Institut de chimie de la matière condensée de Bordeaux Accéder directement au contenu
Article Dans Une Revue Journal of Solid State Chemistry Année : 2023

Effect of simultaneous Cu and Nb doping Bi4V2O11 on structural and electrical properties of Bi4V2−xCux/2Nbx/2O11−3x/4

Résumé

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.

Domaines

Matériaux
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Dates et versions

hal-04018520 , version 1 (07-03-2023)

Identifiants

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Wafaa Mhaira, Abdelmajid Agnaou, Rachida Essalim, Andrea Turino, Fabrice Mauvy, et al.. Effect of simultaneous Cu and Nb doping Bi4V2O11 on structural and electrical properties of Bi4V2−xCux/2Nbx/2O11−3x/4. Journal of Solid State Chemistry, 2023, 320, 123878 (7 p.). ⟨10.1016/j.jssc.2023.123878⟩. ⟨hal-04018520⟩
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