A study on structural properties, conductivity and FT-IR spectroscopy of Cu–Al doubly substituted Bi4V2O11

Rachida Essalim (1) , Abdelaziz Ammar (1) , Mohamed Zamama (2) , Fabrice Mauvy (3)

1 UCA - Université Cadi Ayyad [Marrakech]
2 LPCME - Laboratoire de physico chimie des matériaux et environnement-FSS de Marrakech
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

The double-substituted solid solutions Bi4V2-xCux/2Alx/2O11-5x/4, with identical quantitative compositions of Cu2+ and Al3+ ions, can occur for a substitution rate 0.1 ​≤ ​x ​≤ ​0.6. The compound with x ​= ​0.1 is found to be a monoclinic α-form of Bi4V2O11, whereas compounds with 0.2 ​≤ ​x ​≤ ​0.6 are found to be tetragonal γ and γ’ polymorphs. We used electrochemical impedance spectroscopy to measure the electrical conductivity of doped samples in the temperature range of 250–700 ​°C. The slope changes observed in the Arrhenius plots might be related to the microstructural transitions occurring in these compounds. The sample with x ​= ​0.2 shows the highest ionic conductivity values.

Mots clés: Bismuth vanadium oxide; BIMEVOX materials; Ionic conductors

Domaines: Matériaux

Rachida Essalim, Abdelaziz Ammar, Mohamed Zamama, Fabrice Mauvy. A study on structural properties, conductivity and FT-IR spectroscopy of Cu–Al doubly substituted Bi4V2O11. Journal of Solid State Chemistry, 2020, 288, 121405 (8 p.). ⟨10.1016/j.jssc.2020.121405⟩. ⟨hal-02868745⟩