Study on structural, thermal, sintering and conductivity of Cu-Co doubly substituted Bi4V2O11 |
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Authors: | M Alga A Ammar R Essalim B Tanouti A Outzourhit F Mauvy R Decourt |
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Institution: | (1) Centre d'Excellence de Recherche sur les Matériaux, Université Cadi Ayyad, Faculté des Sciences Semlalia, Marrakech, Maroc;(2) Laboratoire de Physique du Solide et des Couches Minces, Département de physique, Faculté des Sciences Semlalia, Marrakech, Maroc;(3) Institut de Chimie de la Matière Condensée de Bordeaux CNRS, 87, Av. Dr. A. Schweitzer, 33608 Pessac Cedex, France |
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Abstract: | Doubly substitution of vanadium by Cu and Co in the limit of 10% in Bi4V2O11, has led to the formation of the Bi4V1.8Cu0.2−xCoxO10.7 solid solution. X-ray diffraction shows that all the compositions present a tetragonal symmetry. The thermal analysis has
revealed that the polymorph γ' phase, which is formed by a partial ordering of oxygen ions in the γ high temperature form,
is stabilized at room temperature. The influence of sintering temperature on the microstructure of the samples was investigated
by the scanning electron microscopy (SEM). The ceramics sintered at 820 °C for more than 3 hours present micro-craks. The
evolution of the electrical conductivity with temperature and the degree of substitution has been investigated by impedance
spectroscopy. The sample with x=0.1 presents the highest value of the conductivity ≈4.6×10−2 S·cm−1 at 600 °C. |
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