Effect of Niobium doping on structural, thermal, sintering and electrical properties of Bi4V1.8Cu0.2O10.7

M. Alga (1) , Abdelaziz Ammar (1) , B. Tanouti (1) , A. Outzourhit (2) , Fabrice Mauvy (3) , Rodolphe Decourt (3)

1 Laboratoire de Chimie des Matériaux Solides
2 Laboratoire de Physique du Solide et des Couches Minces
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

Doping Bi4V1.8Cu0.2O10.7 with niobium has led to the formation of the Bi4V1.8Cu0.2−xNbxO10.7+3x/2 solid solution. X-ray diffraction and thermal analysis have shown that only the compound with x=0.05 presents a tetragonal symmetry with a γ′ polymorph while the other compositions are of β polymorph. The influence of sintering temperature on the microstructure of the samples was investigated by the scanning electron microscopy (SEM). The ceramics sintered at temperatures higher than 820 °C present micro-craks. The evolution of the electrical conductivity with temperature and the degree of substitution has been investigated by impedance spectroscopy. Among all compositions studied the sample with x=0.05 presents the highest value of the conductivity.

Mots clés: Aurivillius phases; Ionic conductors; BIMEVOX materials; Solid electrolyte

Domaines: Matériaux

M. Alga, Abdelaziz Ammar, B. Tanouti, A. Outzourhit, Fabrice Mauvy, et al.. Effect of Niobium doping on structural, thermal, sintering and electrical properties of Bi4V1.8Cu0.2O10.7. Journal of Solid State Chemistry, 2005, vol. 178, n° 9, p. 2873-2879. ⟨10.1016/j.jssc.2005.06.030⟩. ⟨hal-00096665⟩