Effect of oxygen on short-range order in the Ba1-xBixF2+x solid solution

Malika El Omari (1) , Mohamed El Omari (1) , A. Abaouz (1) , A. Zahouane (1) , T. V. Serov (2) , E. N. Dombrovski (2) , E. I. Ardashnikova (2) , N. G. Haban (3) , V. A. Dolgikh (2) , Jean Sénégas (4)

1 UMI - جامعة مولاي إسماعيل = Université Moulay Ismaïl
2 MSU - Lomonosov Moscow State University
3 Lomonosov State Academy of Fine Chemical Technology
4 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

Various compositions within the range of the fluorite-type solid solution in the BaF2–BiF3–BiOl.5 system are investigated by impedance spectroscopy. This study is carried out along two lines of compositions: δ1, corresponding to the Bal−2z/3Bi2z/3F2+4z/3Oz solid solution, where z is the oxygen rate; and δ2, corresponding to the Bal−xBixF2+x−0.30O0.15 solid solution, where x is the bismuth rate. An approach to the nature of the fluorine–oxygen order is proposed which derives from the clustering process in the Bal−xBixF2+x fluoride solid solution.

Mots clés: Electrical properties; F− ion conductors; Fluorite-type structure; Characterization methods; Impedance spectroscopy; Clustering process

Domaines: Matériaux; Chimie inorganique

Malika El Omari, Mohamed El Omari, A. Abaouz, A. Zahouane, T. V. Serov, et al.. Effect of oxygen on short-range order in the Ba1-xBixF2+x solid solution. Materials Letters, 2003, 57 (26-27), pp.4115-4126. ⟨10.1016/S0167-577X(03)00273-8⟩. ⟨hal-00179114⟩